The next day I and my nerdy friends raided the library. We found 101 Games in BASIC, a book with code for making versions of checkers, Battleship, and the like. It was our Necronomicon.

The BASIC interpreter eats up around 600 bytes in the Arduino RAM, leaving about 1.4 kB for BASIC code. Not much, but more than the lowest-end BASIC Stamp.