The Audio cube is meant primarily to assist people with disabilities that would benefit from audio cues and tactile interaction. It is designed to be rechargeable, portable and fun. At the moment is is still, after a couple of years, lingering in the prototype phase. It's progress reflects my own progress with learning electronics, from playing with pre-made modules to designing my own power system and circuit boards.
I hope to allow the cube to be solar powered (already possible with the charging circuit I have implemented) and the audio to be easily altered for the users needs.
The project uses open source libraries from TMRPCM (WAV playback) and for now the Adafruit ADXL345 library.
I have completed one large prototype, it actually freakin' works! Ans I am now working on a smaller cube, not too small though, with SMD parts and an integraded Lithium polymer battery boosted to 5v.
There is scope to create a second cube and have it communicate with the other to add up dice rolls and communicate the combined score.
You can find more details and all of the code and current eagle files here - http://davidjwatts.com/audio-cube-thehackadayprize/