answer:I adjusted the movement of the entities so that they constantly move to the left while jumping. I moved and changed some lines related to entity movement in the code. Here's the updated full code: ```javascript class Platform { constructor(x, y, w, h) { this.x = x; this.y = y; this.w = w; this.h = h; } collidesWith(obj) { if (obj.y + obj.h <= this.y) return false; if (obj.y >= this.y + this.h) return false; if (obj.x + obj.w <= this.x) return false; if (obj.x >= this.x + this.w) return false; const objAbove = obj.y + obj.h - obj.vy <= this.y; const objBelow = obj.y - obj.vy >= this.y + this.h; const objLeft = obj.x + obj.w - obj.vx <= this.x; const objRight = obj.x - obj.vx >= this.x + this.w; if (obj.vy > 0 && objAbove && !objBelow) { obj.y = this.y - obj.h; obj.vy = 0; obj.jumping = false; return true; } if (obj.vy < 0 && !objAbove && objBelow) { obj.y = this.y + this.h; obj.vy = 0; return true; } if (obj.vx < 0 && objRight) { obj.x = this.x + this.w; obj.vx = 0; return true; } if (obj.vx > 0 && objLeft) { obj.x = this.x - obj.w; obj.vx = 0; return true; } return false; } } class Player { constructor(x, y, w, h) { this.x = x; this.y = y; this.w = w; this.h = h; this.vx = 0; this.vy = 0; this.jumping = false; } move(keys) { const friction = .9; const gravity = 1; if (keys[87] && !this.jumping) { this.vy -= 20; this.jumping = true; } if (keys[68]) { this.vx += 5; } if (keys[65]) { this.vx -= 5; } this.vx *= friction; this.vy += gravity; this.x += this.vx; this.y += this.vy; if (this.x < 0) { this.x = 0; } if (this.y < 0) { this.y = 0; } if (this.x + this.w > canvas.width) { this.x = canvas.width - this.w; this.vx = 0; } if (this.y + this.h > canvas.height) { this.y = canvas.height - this.h; this.vy = 0; this.jumping = false; } } } class Projectile { constructor(x, y, vx, vy) { this.x = x; this.y = y; this.vx = vx; this.vy = vy; this.radius = 10; this.color = "red"; } update() { this.x += this.vx; this.y += this.vy; } draw(ctx) { ctx.beginPath(); ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI); ctx.fillStyle = this.color; ctx.fill(); } } class Entity { constructor() { this.x = canvas.width; this.y = Math.random() * canvas.height; this.w = 20; this.h = 20; this.vx = -1 - Math.random() * 3; this.vy = 0; this.jumping = false; this.projectiles = []; this.color = "blue"; } jump() { if (!this.jumping) { this.vy -= 10; this.jumping = true; } } update(platforms) { for (let i = 0; i < platforms.length; i++) { platforms[i].collidesWith(this); } const friction = .9; const gravity = 1; this.vx *= friction; this.vy += gravity; this.x += this.vx; this.y += this.vy; if (Math.random() < .01) { this.projectiles.push(new Projectile(this.x, this.y, -2 - Math.random() * 6, -2 + Math.random() * 8)); } for (let i = 0; i < this.projectiles.length; i++) { this.projectiles[i].update(); if (this.projectiles[i].x < 0 || this.projectiles[i].y < 0 || this.projectiles[i].x > canvas.width || this.projectiles[i].y > canvas.height) { this.projectiles.splice(i, 1); i; } } if (Math.random() < .01) { this.jump(); } } draw(ctx) { ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y, this.w, this.h); for (let i = 0; i < this.projectiles.length; i++) { this.projectiles[i].draw(ctx); } } } class Game { constructor(canvas) { this.canvas = canvas; this.ctx = canvas.getContext("2d"); this.platforms = []; this.player = new Player(100, 100, 50, 50); this.scrollSpeed = 1; this.entities = []; this.entitySpawnRate = .1; this.entitySpawnTimer = 1; this.entityIncreaseFactor = .1; this.keys = {}; this.platforms.push(new Platform(0, canvas.height - 50, 50, 10)); for (let i = 0; i < 10; i++) { this.createRandomPlatform() } document.addEventListener("keydown", evt => { this.keys[evt.keyCode] = true; }); document.addEventListener("keyup", evt => { delete this.keys[evt.keyCode]; }); requestAnimationFrame(this.update.bind(this)); } createRandomPlatform() { const x = this.canvas.width; const y = Math.random() * this.canvas.height; const w = 200 + Math.random() * 500; const h = 10; this.platforms.push(new Platform(x, y, w, h)); } update() { this.player.move(this.keys); for (let i = 0; i < this.platforms.length; i++) { this.platforms[i].collidesWith(this.player); this.platforms[i].x -= this.scrollSpeed; } for (let i = 0; i < this.entities.length; i++) { if (this.entities[i]) { this.entities[i].update(this.platforms); if (this.entities[i].x < 0) { this.entities.splice(i, 1); i; for (let j = 0; j < this.entityIncreaseFactor; j++) { this.entities.push(new Entity()); } } else { for (let j = 0; j < this.entities[i].projectiles.length; j++) { if (this.entities[i].projectiles[j].x > this.player.x && this.entities[i].projectiles[j].x < this.player.x + this.player.w && this.entities[i].projectiles[j].y > this.player.y && this.entities[i].projectiles[j].y < this.player.y + this.player.h) { this.player.vy -= 20; this.player.jumping = true; this.entities[i].projectiles.splice(j, 1); j; } this.entities[i].draw(this.ctx); } } } } this.player.x -= this.scrollSpeed; if (this.platforms[this.platforms.length - 1].x < this.canvas.width - 200) { this.createRandomPlatform(); } this.entitySpawnTimer++; if (this.entitySpawnTimer >= 60 / this.entitySpawnRate) { this.entitySpawnTimer = 0; this.entities.push(new Entity); this.entitySpawnRate += .001; this.entityIncreaseFactor += .001; this.entityIncreaseFactor = Math.min(this.entityIncreaseFactor, .001); } this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height); for (let i = 0; i < this.platforms.length; i++) { let p = this.platforms[i]; this.ctx.fillRect(p.x, p.y, p.w, p.h); } for (let i = 0; i < this.entities.length; i++) { this.entities[i].draw(this.ctx); } this.ctx.fillRect(this.player.x, this.player.y, this.player.w, this.player.h); requestAnimationFrame(this.update.bind(this)); } } let canvas = document.createElement("canvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; document.body.appendChild(canvas); new Game(canvas); ``` With these changes, the entities should now move from the right side to the left side while jumping, as desired.

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