This is an implementation of the snake video game, written in 6502 assembly.
This implementation is based on Nick Morgan's implementation from easy 6502, itself based on Willem van der Jagt implementation.
I did this project as a first step with 6502 assembly (don't mind it, this is just a tiny personal project, I just like writing nice README.md files).
The game can be played on skilldrick's 6502js 6502 assembler and simulator. A web version of this tool can be found directly on his easy6502 website.
All the code is available in the steve.asm file.
If you played snake, you know how to play:
- You control a snake wanting to eat as much apples as it can.
- When your "head" collides with an apple, you grow and a new apple is generated somewhere else.
You lose if either:
- You go out of the screen boundaries.
- You eat yourself (your head collides with your body).
There are 4 controls to move steve arround:
| Key | Direction |
|---|---|
| w | Move up |
| a | Move left |
| s | Move down |
| d | Move right |
Steve cannot:
- move up if he already moves down
- move left if he already moves right
- ...
Once steve's head collides with an apple, he eats it!
There are 3 kind of apples, based on their colors. Rarer is the apple, more steve will grow after eating it:
| Apple color | probability | Steve growth, in pixel |
|---|---|---|
| Green | 5/8 | 1 |
| Red | 1/4 | 3 |
| Gold | 1/8 | 5 |
I did not add a winning mechanism yet, and after eating too much apples you might encounter a buffer overflow, leading to unwanted behaviors. This bug is also present in the original version. Let's just say that after eating to much apples, steve becomes sick or that the game goes into hard mode, as you wish.
- add a winning mechanism
- set a maximum duration for the gold apple
- add obstacles
- add bonus/malus