There’s no C code in it, just comma-separated numbers that the main code will stick in an array at compile-time. Beyond that, it is a normal Arduino program and you can do what you like.

[Christian] must have gotten bored with his awesome creation one day, because he pulled the drum level display out of his Arduino Sequencer 808, and turned the LED array into a mini Tetris game.

That’s where CodeBender.cc comes in. CodeBender is a browser-based IDE that supports uploading to nearly any Arduino board. You can use the program to copy sample code, browse code uploaded by ...