Zynx has written a guide for Digidrive, complete with screenshots! Digidrive is one of the bit Generations games for the Game Boy Advance (I wrote some guides for Orbital a few months ago). It's a rather complex puzzle game, so if you're going for the high score, be sure to read his guide!
It's available through the guides section, or right here:
http://crackedrabbitgaming.com/guides/gba/digidrive/faq/
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By the way, if anyone knows of other score records, or other high score guides to this game, I'm curious to see them, please post a comment or something to point them out to me. (If they're in Japanese or some other language, I'd appreciate a brief translation too.)