The Arduboy is a micro handheld based on Ardiuno hardware. Most software for the Arduboy is free and open source.
There are a number of places to find Arduboy games.
Currently Arduous only supports
.hex files, which are compiled Arduboy games. Games are also distributed with the
.arduboy extension, which is not currently supported (but may be in the future).
.arduboy files are really just zip files that contain a
.hex file and some other metadata and screenshots, so if you have a
.arduboy game, you can rename it to
.zip and extract it to get the
Other extensions (e.g.
.ino) are source code files and must be compiled into
.hex before they can be played using Arduous.