I can't think of any DSiWare that I'd call a gem, at least not a hidden one - if it's good, chances are people know about it. The only ones I can recommend are the aforementioned Alphabounce, and Pop Island - even if you just get the $2 Paperfield version, it's still a freaking blast.
HungoverHero777 posted...I got Alphabounce on my DSi, but I can't transfer it without losing my progress :(
I was in the same boat, until a few weeks ago when my niece accidentally deleted my save. The worst part was that she was deliberately trying
not to alter my save data - she chose New Game to avoid changing my save. Only problem was, choosing New Game immediately deletes your old save, and doesn't even bother to warn you. >_<
I think I'll go ahead and transfer it now.
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You only need one T-Rex to make the point, though. ~ Samus Sedai