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Tiny Tron

This is a Commodore 64 Tron port I made for Hackclub Say Cheese, a challenge where you have to make a program that fits into a QR code.

To play, you load the file as a disk into a Commodore 64 (or an emulator) and press space to start. Player 1 starts on the left and uses WASD to move, and player 2 starts on the right and uses IJKL to move. When someone loses, the game over screen shows who won and what the score is.

Download

Here's the QR code: (it's big so I hid it by default)

And if you're lazy, here's the binary that's encoded in the QR code:

tron.bin

Screenshots

About

The main challenge of fitting a program in a QR code is that the maximum amount of data one can handle is only 2953 bytes. To put that into perspective, here are some comparisons:

A typical 24 megapixel image would be ~12MB when using JPEG compression. This would fit in a mere 4,064 QR codes
A Windows install ISO (~4.5GB) would fit in 1,523,874 QR codes

It's written in C, compiled by cc65, and uses no external libraries, as they use too much space. It used to be a lot cooler, but then I realized that I can't just put the bytes into the QR code, it needs to be a URL. You can put a file into a QR code by using a data URL and putting the binary data in it with base64 encoding. This made the size limit even lower, down to 2193 bytes. Because of this, I ended up removing most of the cool things like the title screen and making a lot of optimizations.