1 00:00:00,000 --> 00:00:03,540 Welcome back my fellow game developers 2 00:00:03,540 --> 00:00:06,260 to a brand new long video. 3 00:00:06,255 --> 00:00:08,195 We are not going to waste any time. 4 00:00:08,190 --> 00:00:11,340 And this video, what we do is when we kill the enemies, 5 00:00:11,340 --> 00:00:12,450 this is not very exciting. 6 00:00:12,450 --> 00:00:14,300 I'll just tell you, when we kill the enemies, 7 00:00:14,295 --> 00:00:15,875 we pick two random numbers. 8 00:00:15,870 --> 00:00:16,550 That's it. 9 00:00:16,545 --> 00:00:17,885 That's all that we do. 10 00:00:17,880 --> 00:00:19,800 Next video, you'll see why, 11 00:00:19,800 --> 00:00:22,110 but it's a pretty complicated concept 12 00:00:22,110 --> 00:00:24,530 where we learn a new kind of loop. 13 00:00:24,525 --> 00:00:26,255 We learned the truth tables. 14 00:00:26,250 --> 00:00:28,920 So it's very, very worth it. 15 00:00:28,920 --> 00:00:33,120 So that's not waste any more time and let's get started. 16 00:00:33,120 --> 00:00:34,950 Oh, case. 17 00:00:34,950 --> 00:00:37,730 So now we are completing the waves. 18 00:00:37,725 --> 00:00:41,125 It's time to leave the room and go to the next one. 19 00:00:41,125 --> 00:00:43,615 So how are we going to do this? 20 00:00:43,610 --> 00:00:46,810 Let's just take a brief moment to talk about that. 21 00:00:46,805 --> 00:00:49,885 We're going to go into the rooms, the doors. 22 00:00:49,880 --> 00:00:51,200 And as you can see, we have 23 00:00:51,200 --> 00:00:53,690 two doors with two portals behind them. 24 00:00:53,690 --> 00:00:55,400 And this is something that will be the 25 00:00:55,400 --> 00:00:57,400 same in every single level. 26 00:00:57,395 --> 00:01:00,065 I didn't want to add too much thing just to keep 27 00:01:00,065 --> 00:01:03,325 everything less complicated and understandable. 28 00:01:03,320 --> 00:01:04,850 So what we have in here are 29 00:01:04,850 --> 00:01:07,450 the two portals and the two doors. 30 00:01:07,445 --> 00:01:09,775 So what happens when we kill 31 00:01:09,770 --> 00:01:13,990 all the waves or all the enemies in the last wave, 32 00:01:13,985 --> 00:01:18,575 wave, these doors will have the ability to open up. 33 00:01:18,575 --> 00:01:22,055 But as you saw in the game Hades, 34 00:01:22,055 --> 00:01:23,665 we have always two options. 35 00:01:23,660 --> 00:01:26,960 So we have two portals that we can go through 14, 36 00:01:26,960 --> 00:01:28,430 let's say the sharp, the other one 37 00:01:28,430 --> 00:01:30,310 to another enemy arena. 38 00:01:30,305 --> 00:01:32,455 And that's what we want to also do. 39 00:01:32,450 --> 00:01:36,080 We want to have the option to go to one of these two? 40 00:01:36,080 --> 00:01:38,630 So we'll need to set these two portals 41 00:01:38,630 --> 00:01:42,190 beforehand and these two doors also beforehand. 42 00:01:42,185 --> 00:01:44,845 Later on we will be creating maybe some kind 43 00:01:44,840 --> 00:01:49,370 of maybe name appearing once we are next to the door. 44 00:01:49,370 --> 00:01:52,130 So when we open it, we know where we are going. 45 00:01:52,130 --> 00:01:56,950 But for now, let's just focus on actually changing The, 46 00:01:56,945 --> 00:02:00,005 whereas if we click on the Portal and unlock this, 47 00:02:00,005 --> 00:02:01,765 you can see that we have the level 2 48 00:02:01,760 --> 00:02:03,980 goes or the level to load. 49 00:02:03,980 --> 00:02:06,050 So what we'll do is we'll try to 50 00:02:06,050 --> 00:02:08,960 change these as soon as we kill the enemies. 51 00:02:08,960 --> 00:02:10,670 So let's get started. 52 00:02:10,670 --> 00:02:12,410 I'm going to go back into 53 00:02:12,410 --> 00:02:14,300 our code and the first thing I will 54 00:02:14,300 --> 00:02:17,990 do is I'm going to go into the level of exit in here. 55 00:02:17,990 --> 00:02:19,940 And instead of using a string, 56 00:02:19,940 --> 00:02:23,380 we are going to be using a integer. 57 00:02:23,375 --> 00:02:24,785 So an integer. 58 00:02:24,785 --> 00:02:27,125 Why are we working with integers? 59 00:02:27,125 --> 00:02:29,485 Well, because in here we will be 60 00:02:29,480 --> 00:02:31,940 using several methods in the scene manager 61 00:02:31,940 --> 00:02:33,650 that can only taken 62 00:02:33,650 --> 00:02:36,910 an integer parameter that we can work with. 63 00:02:36,905 --> 00:02:39,605 So that's why we are changing it to endanger. 64 00:02:39,605 --> 00:02:42,575 Later on you'll see why all of this is happening. 65 00:02:42,575 --> 00:02:45,205 I'm going to make sure that this is 66 00:02:45,200 --> 00:02:46,370 commented out and we'll 67 00:02:46,370 --> 00:02:47,960 later on we'll come back and change it. 68 00:02:47,960 --> 00:02:50,420 But for now because the loading level is 69 00:02:50,420 --> 00:02:53,450 taking in an integer or you know what, let's keep it. 70 00:02:53,450 --> 00:02:55,790 And let's keep it. 71 00:02:55,790 --> 00:02:57,730 And let's go to the level manager. 72 00:02:57,725 --> 00:02:59,875 And in the loading next level, 73 00:02:59,870 --> 00:03:00,890 instead of a string, 74 00:03:00,890 --> 00:03:03,400 we are going to use an integer. 75 00:03:03,395 --> 00:03:05,705 So the next level is an integer, 76 00:03:05,705 --> 00:03:07,505 and the load scene can actually 77 00:03:07,505 --> 00:03:09,875 take an integer as a parameter. 78 00:03:09,875 --> 00:03:12,205 So everything is working good for now. 79 00:03:12,200 --> 00:03:14,720 The next thing we need to do is we need to set 80 00:03:14,720 --> 00:03:17,500 the two doors or the two-level exits. 81 00:03:17,495 --> 00:03:20,165 And because we already have everything 82 00:03:20,165 --> 00:03:23,435 set up and we know that there will always be two doors. 83 00:03:23,435 --> 00:03:25,045 To just make simple, 84 00:03:25,040 --> 00:03:26,060 I'm going to create 85 00:03:26,060 --> 00:03:31,960 a public and level level 86 00:03:31,955 --> 00:03:37,115 to go to underscore one. 87 00:03:37,115 --> 00:03:39,535 And then I'm going to copy this 88 00:03:39,530 --> 00:03:41,510 and make it the underscore two. 89 00:03:41,510 --> 00:03:43,850 So this is for the second level. 90 00:03:43,850 --> 00:03:49,340 And then I'm also going to create a public level exit. 91 00:03:49,340 --> 00:03:53,330 And this will be the level exit underscore 92 00:03:53,330 --> 00:03:59,240 one and the level exit underscore two. 93 00:03:59,240 --> 00:04:02,060 So now we have the two level exit strategy 94 00:04:02,060 --> 00:04:04,700 and let's go ahead and create a level picker. 95 00:04:04,700 --> 00:04:07,040 So I'm going to scroll down, 96 00:04:07,039 --> 00:04:09,199 but not too much, maybe right here. 97 00:04:09,200 --> 00:04:11,330 And I'm going to say that I have 98 00:04:11,330 --> 00:04:18,880 a public void level picker. 99 00:04:18,875 --> 00:04:20,935 And in here we are going to be 100 00:04:20,930 --> 00:04:23,080 employing a couple of things. 101 00:04:23,075 --> 00:04:27,535 So what we want to do is we want to pick a level. 102 00:04:27,530 --> 00:04:32,410 But that's not as simple as you might think because we, 103 00:04:32,405 --> 00:04:34,925 let say we are currently on the skeleton level. 104 00:04:34,925 --> 00:04:36,565 This Kelly's. Okay. 105 00:04:36,560 --> 00:04:39,200 Let's say we have the option to go, 106 00:04:39,200 --> 00:04:40,360 for example, to the shop. 107 00:04:40,355 --> 00:04:41,635 One of them will be the shop. 108 00:04:41,630 --> 00:04:44,140 We will try to choose a random level. 109 00:04:44,135 --> 00:04:47,335 So we have the option to go to the top on the first door, 110 00:04:47,330 --> 00:04:50,660 but on the second door we get the option to go 111 00:04:50,660 --> 00:04:54,200 to the skull is but we've already been in the Skelly. 112 00:04:54,200 --> 00:04:57,590 So the thing that we need to keep in mind is that every 113 00:04:57,590 --> 00:05:01,120 time we want to have the option to choose another level, 114 00:05:01,115 --> 00:05:03,095 it has to be different 115 00:05:03,094 --> 00:05:05,374 than the current level that we're on. 116 00:05:05,375 --> 00:05:06,745 And not only that, 117 00:05:06,740 --> 00:05:09,640 we need to also have the level. 118 00:05:09,635 --> 00:05:11,425 On the left door different 119 00:05:11,420 --> 00:05:13,180 than the level on the right door. 120 00:05:13,175 --> 00:05:17,795 So essentially, we need three things to keep track of. 121 00:05:17,795 --> 00:05:19,475 The level we're currently on. 122 00:05:19,475 --> 00:05:22,975 The level that will go to if we go through the first door 123 00:05:22,970 --> 00:05:24,730 and the level will go to if we 124 00:05:24,725 --> 00:05:26,875 go through the second door. 125 00:05:26,870 --> 00:05:28,750 So how are we going to do this? 126 00:05:28,745 --> 00:05:30,865 How are we going to implement this? 127 00:05:30,860 --> 00:05:35,630 Finding things while we are still on the same level? 128 00:05:35,630 --> 00:05:39,290 This is where we will use something called a while loop. 129 00:05:39,290 --> 00:05:42,400 So let me tell you what a while loop is and you'll see 130 00:05:42,395 --> 00:05:45,745 how important it is in this situation right here. 131 00:05:45,740 --> 00:05:48,440 So first of all, it's similar to for loops at 132 00:05:48,440 --> 00:05:51,670 executes a block of code a number of times. 133 00:05:51,665 --> 00:05:55,285 Instead of determining the number of times before hand, 134 00:05:55,280 --> 00:05:58,310 we wait until a certain condition is met. 135 00:05:58,310 --> 00:06:01,220 So this is perfect for our case right here, 136 00:06:01,220 --> 00:06:03,920 because we don't know how many times we have 137 00:06:03,920 --> 00:06:06,740 to go through looking for a level, 138 00:06:06,740 --> 00:06:10,930 but we know that we will keep looking while 139 00:06:10,925 --> 00:06:12,595 the level that we want to set on 140 00:06:12,590 --> 00:06:15,340 the first door is different than the current level. 141 00:06:15,335 --> 00:06:18,065 And we will also keep looking while 142 00:06:18,065 --> 00:06:19,825 the second level on 143 00:06:19,820 --> 00:06:22,490 the second door is different than the first one, 144 00:06:22,490 --> 00:06:24,470 which is already and 145 00:06:24,470 --> 00:06:27,500 different than the level we are currently on. 146 00:06:27,500 --> 00:06:29,000 So let me just take you through 147 00:06:29,000 --> 00:06:30,790 the structure of the for loop. 148 00:06:30,785 --> 00:06:32,065 You can see right here, 149 00:06:32,060 --> 00:06:33,590 we have the while. 150 00:06:33,590 --> 00:06:35,380 We open up the brackets, 151 00:06:35,375 --> 00:06:37,025 we put in a condition. 152 00:06:37,025 --> 00:06:39,545 It's exactly the same as the if statement. 153 00:06:39,545 --> 00:06:40,805 And if it is true, 154 00:06:40,805 --> 00:06:43,525 then we will do something called execute and then 155 00:06:43,520 --> 00:06:46,420 go back to the condition, condition change. 156 00:06:46,415 --> 00:06:48,295 If it hasn't, we go back. 157 00:06:48,290 --> 00:06:51,650 So make sure to take precaution whenever using while 158 00:06:51,650 --> 00:06:55,220 loops because they can cause a lot of problems. 159 00:06:55,220 --> 00:06:57,350 You can end up in a endless loop where 160 00:06:57,350 --> 00:07:00,580 the condition doesn't change and your Unity will crash. 161 00:07:00,575 --> 00:07:02,995 Trust me, it happens and happens to me 162 00:07:02,990 --> 00:07:05,470 all the time whenever I'm using while loops. 163 00:07:05,465 --> 00:07:08,215 So make sure you know the problem. 164 00:07:08,210 --> 00:07:10,520 Make sure you always change 165 00:07:10,520 --> 00:07:13,370 the condition and always get out of the while loop. 166 00:07:13,370 --> 00:07:14,570 Anyways, with that said, 167 00:07:14,570 --> 00:07:16,400 let's go back to Unity. 168 00:07:16,400 --> 00:07:18,470 And here, I mean Visual Studio. 169 00:07:18,470 --> 00:07:20,320 And what are we going to do in here? 170 00:07:20,315 --> 00:07:24,745 We are going to say that while level to go 171 00:07:24,740 --> 00:07:29,630 to one is equal to the scene manager, 172 00:07:29,630 --> 00:07:37,420 dot, get active, seen dot index. 173 00:07:37,415 --> 00:07:41,275 Then we are going to go ahead and create 174 00:07:41,270 --> 00:07:45,260 a random random number which is 175 00:07:45,260 --> 00:07:52,390 equal to a random dot range from 0 or actually from one. 176 00:07:52,385 --> 00:07:53,605 What are we using one? 177 00:07:53,600 --> 00:07:56,480 Well, because we know that the scene on index 178 00:07:56,480 --> 00:07:59,810 0 is not something that we would like to go to. 179 00:07:59,810 --> 00:08:01,270 Let me show you what I mean. 180 00:08:01,265 --> 00:08:03,095 If I go back into the File, 181 00:08:03,095 --> 00:08:06,265 BuildSettings, the first one as the title screen, 182 00:08:06,260 --> 00:08:08,330 the new weapon spikes and everything 183 00:08:08,330 --> 00:08:11,110 is available except for the 0, 184 00:08:11,105 --> 00:08:13,505 which, and the, obviously the last one. 185 00:08:13,505 --> 00:08:16,415 So in here, the random we'll start at one. 186 00:08:16,415 --> 00:08:20,245 So from one to the scene manager, 187 00:08:20,240 --> 00:08:24,110 the scene count in Build Settings. 188 00:08:24,110 --> 00:08:25,940 And you can see right here, this is the number 189 00:08:25,940 --> 00:08:28,000 of scenes and the build settings. 190 00:08:27,995 --> 00:08:30,875 And we are going to reduce it by one, 191 00:08:30,875 --> 00:08:34,645 because obviously we don't want the last one in there. 192 00:08:34,640 --> 00:08:37,870 So now that we have a random number of our scenes, 193 00:08:37,865 --> 00:08:41,705 I'm just going to go ahead and print that random number. 194 00:08:41,705 --> 00:08:51,845 So print and let's say the room for the random number, 195 00:08:51,845 --> 00:08:57,935 random number is and first round. 196 00:08:57,935 --> 00:09:00,955 And then in here we are going to set the level 197 00:09:00,950 --> 00:09:04,100 to go one to be equal to rant. 198 00:09:04,100 --> 00:09:07,070 Okay, so what's happening in here? 199 00:09:07,070 --> 00:09:10,490 First of all, we say that while the level to 200 00:09:10,490 --> 00:09:15,320 go is equal to the current build index, 201 00:09:15,319 --> 00:09:17,959 then we are going to enter the while loop, 202 00:09:17,960 --> 00:09:19,940 chosen random number assigned 203 00:09:19,940 --> 00:09:22,310 the level to go if it's still the same, 204 00:09:22,310 --> 00:09:23,890 and then check the condition in here. 205 00:09:23,885 --> 00:09:25,225 If it's still the same, 206 00:09:25,220 --> 00:09:26,750 then again we will create 207 00:09:26,750 --> 00:09:29,830 another random number and assign it to the level to go. 208 00:09:29,825 --> 00:09:31,435 And we will keep doing this. 209 00:09:31,430 --> 00:09:35,270 While the level to go 1 is equal to 210 00:09:35,270 --> 00:09:37,550 the scene manager or the build index 211 00:09:37,550 --> 00:09:40,120 of the scene that is active right now. 212 00:09:40,115 --> 00:09:43,945 Once It's not, once this condition is no longer met, 213 00:09:43,940 --> 00:09:46,850 we will continue on to setting over things. 214 00:09:46,850 --> 00:09:48,290 Before we continue. 215 00:09:48,290 --> 00:09:51,860 Obviously, we need to do something which is set the level 216 00:09:51,860 --> 00:09:55,990 to go one to be equal to the scene manager. 217 00:09:55,985 --> 00:09:59,255 The just copy this one. 218 00:09:59,255 --> 00:10:01,075 So we're just sending it at 219 00:10:01,070 --> 00:10:02,870 the beginning as this one just so we 220 00:10:02,870 --> 00:10:06,250 can enter into the loop and then continue on. 221 00:10:06,245 --> 00:10:07,745 So let's save that. 222 00:10:07,745 --> 00:10:11,545 Let's go back into our gain o and we actually. 223 00:10:11,540 --> 00:10:13,100 We haven't got this yet. 224 00:10:13,100 --> 00:10:14,420 So to call this, 225 00:10:14,420 --> 00:10:15,850 where should we be calling it? 226 00:10:15,845 --> 00:10:18,245 I believe this is part of your challenge. 227 00:10:18,245 --> 00:10:21,745 Well, I think it will be part of your challenge. 228 00:10:21,740 --> 00:10:24,790 So unfortunately we will not be able to test it. 229 00:10:24,785 --> 00:10:26,485 But, or you know what, 230 00:10:26,480 --> 00:10:27,710 let's test it out. 231 00:10:27,710 --> 00:10:31,730 So if I go to where do you think if you want to, 232 00:10:31,730 --> 00:10:33,290 you can make it a challenge. 233 00:10:33,290 --> 00:10:35,830 But unfortunately, I've already shown you. 234 00:10:35,825 --> 00:10:39,485 So in here when we said the debug, 235 00:10:39,485 --> 00:10:40,735 all waves are complete. 236 00:10:40,730 --> 00:10:42,080 Let's just keep this, 237 00:10:42,080 --> 00:10:44,540 remove the common because now we can 238 00:10:44,540 --> 00:10:47,200 actually go ahead and access the level manager. 239 00:10:47,195 --> 00:10:49,315 And I believe it is an instance. 240 00:10:49,310 --> 00:10:53,260 And we will access the level picker. 241 00:10:53,255 --> 00:10:56,885 And now we can actually pick a level and we 242 00:10:56,885 --> 00:11:00,425 should also make sure that the waves are complete. 243 00:11:00,425 --> 00:11:02,185 And we also need to make sure that 244 00:11:02,180 --> 00:11:03,900 the waves are complete. 245 00:11:03,904 --> 00:11:06,204 So how are we going to do this? 246 00:11:06,200 --> 00:11:07,580 This is something we should have 247 00:11:07,580 --> 00:11:09,340 done prior, but no worries. 248 00:11:09,335 --> 00:11:11,995 We are going to create a private variable in 249 00:11:11,990 --> 00:11:16,470 here and waves complete. 250 00:11:17,020 --> 00:11:21,050 And we will set it as false at the beginning. 251 00:11:21,050 --> 00:11:26,570 So private, oh, sorry, Boolean waves complete. 252 00:11:26,570 --> 00:11:28,790 And where do we set it to true? 253 00:11:28,790 --> 00:11:31,700 Down here after all the waves are complete. 254 00:11:31,700 --> 00:11:35,600 So waves complete is equal to true. 255 00:11:35,600 --> 00:11:38,240 And where does this affect everything? 256 00:11:38,240 --> 00:11:39,950 Well, up here, if we 257 00:11:39,950 --> 00:11:42,830 look where we are spawning every single time. 258 00:11:42,830 --> 00:11:45,530 So I'm going to indent this using the tab. 259 00:11:45,530 --> 00:11:48,700 And I'm going to say if waves are 260 00:11:48,695 --> 00:11:52,325 not complete yet, so, right? 261 00:11:52,325 --> 00:11:57,565 Waves complete are not yet complete. 262 00:11:57,560 --> 00:11:59,570 So if this one is still false, 263 00:11:59,570 --> 00:12:01,640 which it shouldn't be false until we 264 00:12:01,640 --> 00:12:04,060 turn into true right here. 265 00:12:04,055 --> 00:12:07,445 So as this keep it as that, 266 00:12:07,445 --> 00:12:08,545 I believe this will work, 267 00:12:08,540 --> 00:12:09,890 but you know what, I'm going to 268 00:12:09,890 --> 00:12:11,720 add the two squiggly lines, 269 00:12:11,720 --> 00:12:13,980 make sure everything is set up properly. 270 00:12:13,984 --> 00:12:17,644 So now, once we destroy or finish all the waves, 271 00:12:17,645 --> 00:12:19,235 Waves complete is done. 272 00:12:19,235 --> 00:12:24,445 We are no longer counting down and we choose a level. 273 00:12:24,440 --> 00:12:27,200 So we'll try to see how that looks in our game. 274 00:12:27,200 --> 00:12:29,650 So we run. 275 00:12:29,645 --> 00:12:31,825 And I believe we should remove 276 00:12:31,820 --> 00:12:34,730 the just to make it faster. 277 00:12:34,730 --> 00:12:38,830 So I'm going to shoot the enemies couple of times. 278 00:12:38,825 --> 00:12:40,595 Wait for the second wave, 279 00:12:40,595 --> 00:12:44,315 which are the cowardly find eyes. 280 00:12:44,315 --> 00:12:47,635 I'm going to shoot the cowardly flying eyes. 281 00:12:47,630 --> 00:12:49,280 And there we go. 282 00:12:49,280 --> 00:12:51,050 And we have one still here. 283 00:12:51,050 --> 00:12:52,400 So once we kill it, 284 00:12:52,400 --> 00:12:54,260 we have the random number three. 285 00:12:54,260 --> 00:12:56,810 And let's open up the console and pause the game. 286 00:12:56,810 --> 00:12:58,490 So if we look in the console, 287 00:12:58,490 --> 00:13:01,220 we have the random number is three. 288 00:13:01,220 --> 00:13:04,400 So obviously this work for the first time. 289 00:13:04,400 --> 00:13:07,160 Let's see what the build index 40s, 290 00:13:07,160 --> 00:13:08,920 Kelly's are, its two. 291 00:13:08,915 --> 00:13:11,555 So three is the boss level. 292 00:13:11,555 --> 00:13:14,155 So we chose another level. 293 00:13:14,150 --> 00:13:14,710 Excellent. 294 00:13:14,705 --> 00:13:16,535 I really want for you to see 295 00:13:16,535 --> 00:13:19,915 the random number being chosen multiple times, 296 00:13:19,910 --> 00:13:21,980 but no worries, we will have a lot of 297 00:13:21,980 --> 00:13:24,530 opportunity for those things. 298 00:13:24,530 --> 00:13:26,420 I'm going to remove this one in 299 00:13:26,420 --> 00:13:28,670 here and the debug right here, 300 00:13:28,670 --> 00:13:30,670 because we already know everything 301 00:13:30,665 --> 00:13:33,295 is working perfectly fine. 302 00:13:33,290 --> 00:13:35,330 But there is obviously 303 00:13:35,330 --> 00:13:37,690 still the second level that we want to set. 304 00:13:37,685 --> 00:13:41,615 So I'm going to issue it to you as a challenge. 305 00:13:41,615 --> 00:13:45,305 And your challenge is to set the level to go to, 306 00:13:45,305 --> 00:13:47,705 to get it pun intended. 307 00:13:47,705 --> 00:13:50,975 So after setting the first-level to go to, 308 00:13:50,975 --> 00:13:53,065 we need to set the second one. 309 00:13:53,060 --> 00:13:54,710 And the second one should be 310 00:13:54,710 --> 00:13:57,190 different than the first level. 311 00:13:57,185 --> 00:13:59,455 And the first-level to go 312 00:13:59,450 --> 00:14:01,990 to and the one we are currently on. 313 00:14:01,985 --> 00:14:05,255 So you'll need to make sure to initialize it. 314 00:14:05,255 --> 00:14:07,585 And I'm going to give you a hint because 315 00:14:07,580 --> 00:14:09,560 we want to make sure that it's different 316 00:14:09,560 --> 00:14:11,270 than the first one and 317 00:14:11,270 --> 00:14:13,960 different than the one we are currently on. 318 00:14:13,955 --> 00:14:16,325 You'll need to use the OR 319 00:14:16,325 --> 00:14:18,355 for the while condition to stop. 320 00:14:18,350 --> 00:14:21,140 And I haven't shown you the sea yet, 321 00:14:21,140 --> 00:14:23,380 so I'm going to show it to you right here. 322 00:14:23,375 --> 00:14:25,465 If you want, you can maybe, I don't know, 323 00:14:25,460 --> 00:14:27,500 take a screenshot or maybe then go back 324 00:14:27,500 --> 00:14:29,630 and see the whole steps of the challenge. 325 00:14:29,630 --> 00:14:31,450 I'm going to now show you 326 00:14:31,445 --> 00:14:35,525 the truth table and the truth table. 327 00:14:35,525 --> 00:14:36,955 So let's start with the end. 328 00:14:36,950 --> 00:14:38,450 So the end a truth table. 329 00:14:38,450 --> 00:14:39,560 How does it work? 330 00:14:39,560 --> 00:14:41,660 If we have several conditions, 331 00:14:41,660 --> 00:14:43,100 as I've said right now, 332 00:14:43,100 --> 00:14:45,400 we need to make sure that it's different than 333 00:14:45,395 --> 00:14:47,335 the current level and 334 00:14:47,330 --> 00:14:49,100 different than the first one we've set. 335 00:14:49,100 --> 00:14:52,430 So it has to be a while loop which checks 336 00:14:52,430 --> 00:14:55,910 for using the all so while level 337 00:14:55,910 --> 00:14:59,360 two that we're going to set is 338 00:14:59,360 --> 00:15:04,520 equal to love and want to go or level two to go, 339 00:15:04,520 --> 00:15:06,320 then we will need to change it. 340 00:15:06,320 --> 00:15:08,200 It needs to be different than both. 341 00:15:08,195 --> 00:15:10,555 So let me show you how the true, 342 00:15:10,550 --> 00:15:12,320 the truth table works. 343 00:15:12,320 --> 00:15:14,440 If you have two true, we get a true. 344 00:15:14,435 --> 00:15:17,675 If we have a false and a true, we get a false. 345 00:15:17,675 --> 00:15:20,365 If we have a false and a false, we get a false, 346 00:15:20,360 --> 00:15:21,970 we have a true and a false, 347 00:15:21,965 --> 00:15:23,705 we get a false. 348 00:15:23,705 --> 00:15:25,865 But when it comes to the, OR, 349 00:15:25,865 --> 00:15:30,145 you'll see that if we have one false and one true, then. 350 00:15:30,140 --> 00:15:32,320 Answer will be true, 351 00:15:32,315 --> 00:15:34,675 but if both of them are false, 352 00:15:34,670 --> 00:15:37,060 then the answer will be false. 353 00:15:37,055 --> 00:15:39,215 So with that information, 354 00:15:39,215 --> 00:15:41,525 I know it's a bit confusing now when we 355 00:15:41,525 --> 00:15:43,865 do actually have the solution for the challenge, 356 00:15:43,865 --> 00:15:45,575 I will explain to you everything, 357 00:15:45,575 --> 00:15:47,945 even though this video is getting very long, 358 00:15:47,945 --> 00:15:49,315 but no worries about that. 359 00:15:49,310 --> 00:15:53,740 Pause the video right now and go do the challenge. 360 00:15:53,735 --> 00:15:55,855 Okay, welcome back. 361 00:15:55,850 --> 00:15:57,710 How did you get on with that? 362 00:15:57,710 --> 00:15:59,500 So in the level manager, 363 00:15:59,495 --> 00:16:01,855 I know this is one of the tougher challenges, 364 00:16:01,850 --> 00:16:04,540 but we are in the Advanced Challenge. 365 00:16:04,535 --> 00:16:10,525 So in here I'm going to say that the wild and level 2, 366 00:16:10,520 --> 00:16:19,330 oops, the level to go to is equal to the level to go one. 367 00:16:19,330 --> 00:16:24,000 Or how's the, or it's these two columns, 368 00:16:23,995 --> 00:16:27,085 or the level to go to is 369 00:16:27,085 --> 00:16:31,215 equal to the scene manager dot index. 370 00:16:31,210 --> 00:16:33,470 So the current one. 371 00:16:34,410 --> 00:16:37,860 Then in here we are going to go ahead 372 00:16:37,855 --> 00:16:40,825 and do the same exact thing. 373 00:16:40,825 --> 00:16:44,035 Copy this, oops. 374 00:16:44,100 --> 00:16:46,330 Paste it in here. 375 00:16:46,330 --> 00:16:50,940 And the random number 1, oops, sorry. 376 00:16:50,935 --> 00:16:55,005 Now, random number 1 and random number two. 377 00:16:55,005 --> 00:16:59,335 And the level to go to is equal to random 2. 378 00:16:59,330 --> 00:17:02,900 And India, we are going to save that the level to go to 379 00:17:02,900 --> 00:17:07,250 is equal to the scene manager dot instance. 380 00:17:07,250 --> 00:17:09,290 Or we can say that level to go to 381 00:17:09,290 --> 00:17:10,880 as equal to level to go one. 382 00:17:10,880 --> 00:17:12,530 But you know what, I don't want to risk 383 00:17:12,530 --> 00:17:14,950 that does just keep things safe. 384 00:17:14,945 --> 00:17:17,515 But, oops, paste it in here, 385 00:17:17,510 --> 00:17:20,560 save that what is happening right now. 386 00:17:20,555 --> 00:17:22,795 So there is a problem because 387 00:17:22,790 --> 00:17:25,220 we cannot use the level exit to, 388 00:17:25,220 --> 00:17:28,750 we need to set the level to go to save that. 389 00:17:28,745 --> 00:17:30,295 So what's happening in here? 390 00:17:30,290 --> 00:17:31,760 We've set the level to go to, 391 00:17:31,760 --> 00:17:33,140 to be exactly as 392 00:17:33,140 --> 00:17:37,130 the scene manager or the index on the current scene. 393 00:17:37,130 --> 00:17:39,650 And in here we check what is 394 00:17:39,650 --> 00:17:41,840 the condition in here, as we've said, 395 00:17:41,840 --> 00:17:45,190 if we go back into our truth table of the off, 396 00:17:45,185 --> 00:17:46,855 let's keep it here and let's 397 00:17:46,850 --> 00:17:48,350 see how everything is looking. 398 00:17:48,350 --> 00:17:53,450 So we start off by checking as level to go to equal two, 399 00:17:53,450 --> 00:17:55,040 level to go one. 400 00:17:55,040 --> 00:17:57,790 And currently the level to go 401 00:17:57,785 --> 00:17:59,995 to or solid level to go one 402 00:17:59,990 --> 00:18:02,290 will be different than the current scene manager. 403 00:18:02,285 --> 00:18:05,395 So this condition is false, which is good. 404 00:18:05,390 --> 00:18:07,900 That means we will not enter into the while loop. 405 00:18:07,895 --> 00:18:10,915 But we then check level to go to, 406 00:18:10,910 --> 00:18:13,420 is it equal to the current build index? 407 00:18:13,415 --> 00:18:14,135 It is. 408 00:18:14,135 --> 00:18:17,845 Then we have a true condition which is right here, 409 00:18:17,840 --> 00:18:20,410 and a false condition which is right here. 410 00:18:20,405 --> 00:18:22,885 So if we look in the truth table, 411 00:18:22,880 --> 00:18:27,080 we have a true condition with a false condition, 412 00:18:27,079 --> 00:18:31,299 that means the whole set of conditions is true. 413 00:18:31,295 --> 00:18:34,085 That means we then go back into the while loop, 414 00:18:34,085 --> 00:18:36,085 and that's exactly what we want. 415 00:18:36,080 --> 00:18:39,830 If we have 11 of these true, 416 00:18:39,830 --> 00:18:41,750 we want to go back and create 417 00:18:41,750 --> 00:18:45,380 another random number and set the random number again. 418 00:18:45,380 --> 00:18:47,180 And we will keep doing that 419 00:18:47,180 --> 00:18:49,280 until this condition is false. 420 00:18:49,280 --> 00:18:51,250 And this condition is false, 421 00:18:51,245 --> 00:18:53,785 because only two conditions that are 422 00:18:53,780 --> 00:18:56,680 false make a total false. 423 00:18:56,675 --> 00:18:59,275 So back in here, if the level to go 424 00:18:59,270 --> 00:19:02,240 to different than the level to go one, 425 00:19:02,240 --> 00:19:04,640 and it's different than the current one. 426 00:19:04,640 --> 00:19:08,020 Only then when both of these are false, 427 00:19:08,015 --> 00:19:11,875 the entire condition is false and we continue on. 428 00:19:11,870 --> 00:19:13,700 So let's go back in here. 429 00:19:13,700 --> 00:19:15,470 We will print those and run 430 00:19:15,470 --> 00:19:17,330 the game and lets you know what, 431 00:19:17,330 --> 00:19:20,000 let's remove 11 manager who has remove one 432 00:19:20,000 --> 00:19:23,380 of the scary guys. 433 00:19:23,375 --> 00:19:25,975 And let's remove this one also and run 434 00:19:25,970 --> 00:19:29,410 the game because we want to demonstrate this pretty fast. 435 00:19:29,405 --> 00:19:33,625 So the enemy will appear in 436 00:19:33,620 --> 00:19:35,840 just a bit so that we will have 437 00:19:35,840 --> 00:19:38,270 only one skeleton to skeletons actually, 438 00:19:38,270 --> 00:19:41,490 once we killed them, we should see that. 439 00:19:42,820 --> 00:19:45,500 There we go. So we call them, 440 00:19:45,500 --> 00:19:47,060 go to the console, 441 00:19:47,060 --> 00:19:49,580 pause the video, pause the game. 442 00:19:49,580 --> 00:19:51,680 I mean, and you can see that we run them. 443 00:19:51,680 --> 00:19:53,320 Number 1 is 3, 444 00:19:53,315 --> 00:19:55,175 the random number 2 is 4. 445 00:19:55,175 --> 00:19:56,315 They are both different. 446 00:19:56,315 --> 00:19:59,465 We've picked levels, make sure to commit your changes, 447 00:19:59,464 --> 00:20:03,154 and I'll see you in the next one.