“1+2=3” HTML5 game built with Phaser update to Phaser 3 and commented
Talking about 1+2=3 game, Game development, HTML5, Javascript and Phaser.
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If you think you are quick and clever with simple math operations, 1+2=3 will prove your skills.
Starting from this the prototype, I added some kind of story and 132 levels (yes, 132) then released Matt Vs Math, which was sponsored by Softgames.
The concept remains interesting, so I decided to update it to Phaser 3, but first have a go with the game:
Although the game is very simple, looking at the source code you will learn some key concepts like tweens, timer and sprite masking.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 | // the game itself var game; var gameOptions = { // maximum length of the sum maxSumLen: 5, // local storage name used to save high score localStorageName: "oneplustwo" , // time allowed to answer a question, in milliseconds timeToAnswer: 3000, // score needed to increase difficulty nextLevel: 400 } // once the window has been loaded... window.onload = function () { // game configuration object var gameConfig = { width: 500, height: 500, scene: [playGame], backgroundColor: 0x444444 } // creation of the game itself game = new Phaser.Game(gameConfig); } // "PlayGame" scene class playGame extends Phaser.Scene{ constructor(){ super ( "PlayGame" ); } // when the scene preloads... preload(){ // preloading images this .load.image( "timebar" , "timebar.png" ); // preloading a spritesheet where each sprite is 400x50 pixels this .load.spritesheet( "buttons" , "buttons.png" , { frameWidth: 400, frameHeight: 50 }); } // when the sceen has been created... create(){ // it's not game over yet... this .isGameOver = false ; // current score is set to zero this .score = 0; // we'll also keep track of correct answers this .correctAnswers = 0; // topScore gets the previously saved value in local storage if any, zero otherwise this .topScore = localStorage.getItem(gameOptions.localStorageName) == null ? 0 : localStorage.getItem(gameOptions.localStorageName); // sumsArray is the array with all possible questions this .sumsArray = []; // rather than tossing a random question each time, I found easier // to store all possible questions in an array then draw a random question // each time. I just need an algorithm to generate all possible questions. // let's start building all possible questions with this loop // ranging from 1 (only one operator, like 1+1) to maxSumLen // (in this case 5, like 1+1+1+1-1-1) for ( var i = 1; i < gameOptions.maxSumLen; i++){ // defining sumsArray[i] as an array of three empty arrays this .sumsArray[i]=[[], [], []]; // looping from 1 to 3, which are the possible results of each sum for ( var j = 1; j <= 3; j++){ // buildTrees is the core of the script, see it explained // some lines below this .buildThrees(j, 1, i, j); } } // try this! You will see all possible combinations console.log( this .sumsArray); // questionText is the text object which will display the question this .questionText = this .add.text(250 , 160, "-" , { font: "bold 72px Arial" }); // setting questionText registration point to its center this .questionText.setOrigin(0.5); // scoreText will keep the current score this .scoreText = this .add.text(10, 10, "-" , { font: "bold 24px Arial" }); // loop to create the three answer buttons for (i = 0; i < 3; i++){ // creation of the answer button var numberButton = this .add.sprite(game.config.width / 2, 250 + i * 75, "buttons" ); // showing the i-th frame numberButton.setFrame(i); // setting numberButton interactive numberButton.setInteractive(); // calling checkAnswer method if clicked/tapped numberButton.on( "pointerdown" , this .checkAnswer); } // adding the time bar var numberTimer = this .add.sprite(game.config.width / 2, 325, "timebar" ); // the same image will also be used as a mask this .buttonMask = this .add.sprite(game.config.width / 2, numberTimer.y, "timebar" ); // we do not need to show the mask image this .buttonMask.setVisible( false ); // creation of the mask itself var mask = this .buttonMask.createBitmapMask(); // applying mask to number timer numberTimer.setMask(mask); // method to ask next question this .nextNumber(); } // buildThrees method, it will find all possible sums // arguments: // initialNumber: the first number. Each question always start with a positive number // currentIndex: it's the amount of operands already placed in the sum // limit: the max amount of operands allowed in the question // currentString: the string generated so far buildThrees(initialNummber, currentIndex, limit, currentString){ // the possible operands, from -3 to 3, excluding the zero var numbersArray = [-3, -2, -1, 1, 2, 3]; // looping from 0 to numbersArray's length for ( var i = 0; i < numbersArray.length; i++){ // "sum" is the sum between the first number and current numberArray item var sum = initialNummber + numbersArray[i]; // output string is generated by the concatenation of current string with // current numbersArray item. I am adding a "+" if the item is greater than zero, // otherwise it already has its "-" var outputString = currentString + (numbersArray[i] < 0 ? "" : "+" ) + numbersArray[i]; // if sum is between 1 and 3 and we reached the limit of operands we want... if (sum > 0 && sum < 4 && currentIndex == limit){ // then push the output string into sumsArray[amount of operands][result] this .sumsArray[limit][sum - 1].push(outputString); } // if the amount of operands is still below the amount we want... if (currentIndex < limit){ // recursively calling buildThrees, passing as arguments: // the current sum // the new amount of operands // the amount of operands we want // the current output string this .buildThrees(sum, currentIndex + 1, limit, outputString); } } } // this method asks next question nextNumber(){ // updating score text this .scoreText.setText( "Score: " + this .score.toString() + "\nBest Score: " + this .topScore.toString()); // if we already answered more than one question... if ( this .correctAnswers > 1){ // stopping time tween this .timeTween.stop(); // resetting mask horizontal position this .buttonMask.x = game.config.width / 2; } // if we already answered at least one question... if ( this .correctAnswers > 0){ // tween to slide out the mask, unvealing what's behind it this .timeTween = this .tweens.add({ targets: this .buttonMask, x: -150, duration: gameOptions.timeToAnswer, callbackScope: this , onComplete: function (){ // calling "gameOver" method. "?" is the string to display this .gameOver( "?" ); } }); } // drawing a random result between 0 and 2 (it will be from 1 to 3) this .randomSum = Phaser.Math.Between(0, 2); // choosing question length according to current score var questionLength = Math.min(Math.floor( this .score / gameOptions.nextLevel) + 1, 4) // updating question text this .questionText.setText( this .sumsArray[questionLength][ this .randomSum][Phaser.Math.Between(0, this .sumsArray[questionLength][ this .randomSum].length - 1)]); } // method to check the answer, the argument is the button pressed checkAnswer(){ // we check the answer only if it's not game over yet if (! this .scene.isGameOver){ // button frame is equal to randomSum means the answer is correct if ( this .frame.name == this .scene.randomSum){ // score is increased according to the time spent to answer this .scene.score += Math.floor(( this .scene.buttonMask.x + 350) / 4); // one more correct answer this .scene.correctAnswers++; // moving on to next question this .scene.nextNumber(); } // wrong answer else { // if it's not the first question... if ( this .scene.correctAnswers > 1) { // stop the tween this .scene.timeTween.stop(); } // calling "gameOver" method. "this.frame.name + 1" is the string to display this .scene.gameOver( this .frame.name + 1); } } } // method to end the game. The argument is the string to write gameOver(gameOverString){ // changing background color this .cameras.main.setBackgroundColor( "#ff0000" ); // displaying game over text this .questionText.setText( this .questionText.text + " = " + gameOverString); // now it's game over this .isGameOver = true ; // updating top score in local storage localStorage.setItem(gameOptions.localStorageName, Math.max( this .score, this .topScore)); // restart the game after two seconds this .time.addEvent({ delay: 2000, callback: function (){ this .scene.start( "PlayGame" ); }, callbackScope: this }); } } |
What is your best score? Have fun with the game and download the source code.
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