A simple browser game is a great school project because it combines creativity, logic, math, and visual design in one working product. Students can build games such as a clicker, platformer, maze, or Tetris-style puzzle using JavaScript Canvas or p5.js. The goal is to make a small game that runs in the browser, responds to player input, and clearly shows rules, score, and feedback.
Starting small helps you finish a polished project instead of getting stuck on too many features.
Key Facts
- A basic game loop repeats these steps: read input, update game state, check collisions, draw the screen.
- In JavaScript Canvas, ctx.clearRect(0, 0, width, height) clears the screen before redrawing each frame.
- Position update formula: x = x + vx and y = y + vy, where vx and vy are velocity values.
- Rectangle collision test: ax < bx + bw && ax + aw > bx && ay < by + bh && ay + ah > by.
- Score can be updated with score = score + points when the player completes a goal or hits a target.
- A good prototype should include one player action, one obstacle or target, one scoring rule, and one win or lose condition.
Vocabulary
- Game loop
- A repeating cycle that updates the game world and redraws the screen many times per second.
- Sprite
- A visual game object such as a player, enemy, platform, block, or item.
- Canvas
- An HTML element that lets JavaScript draw shapes, images, text, and animations in a browser.
- Collision detection
- The process of checking whether two game objects are touching or overlapping.
- Input handling
- The code that detects player actions such as key presses, mouse clicks, or screen taps.
Common Mistakes to Avoid
- Building too many features at once is a mistake because it makes debugging harder and can stop the project from being finished. Start with one core mechanic, then add polish after it works.
- Drawing new frames without clearing the old frame is a mistake because it can leave trails or messy graphics on the screen. Clear the canvas before redrawing the updated scene.
- Checking only one corner during collision detection is a mistake because two rectangles can overlap even when that corner is not inside the other object. Use a full rectangle overlap test for reliable results.
- Putting all code in one giant block is a mistake because it becomes difficult to read, test, and repair. Separate the project into functions such as setup, update, draw, handleInput, and checkCollisions.
Practice Questions
- 1 A player starts at x = 40 and moves right with vx = 3 pixels per frame. What is the player's x-position after 25 frames?
- 2 A target gives 10 points each time it is clicked. If a player clicks it 7 times and then loses 15 points for one mistake, what is the final score?
- 3 Your platformer character sometimes falls through a platform when moving very fast. Explain why this might happen and describe one way to improve the collision checking.