Continuing the discussion from Multi-player linked Arduboys?:
There has been some desire to be able to extend the limited amount of storage available in the Arduboy, especially for the layouts of game levels, or similar data. Here's one approach that would work, although it would require tethering your Arduboy to a PC.
Game level info, or other data, would be stored on the PC. A program running on the PC would connect to and monitor the virtual serial port that the Arduboy's USB port is connected to. The Arduboy would send simple commands to the PC, such a request for the data for a specific game level. When the PC received a command, it would send the requested data to the Arduboy.
As I mentioned in a post under the the topic that this thread was linked from, the "PC" could be very small and quite portable.