Hamtaro Ham Ham Heartbreak may quite possibly be the most awesome non pokemon GBA game in all of history.
You serious bro? o-o
Anyways, picked up a few random titles today.
Pokemon Emerald (I can't resist! I've been wanting another for awhile xD), Reign of Fire (no clue but it was $1, what do I have to lose?), Digimon Battle Spirit 2 (looks like a semi-decent fighter, at least for when I wanna kill a few minutes), Boktai (actually really excited about trying this one once the sun comes out- looks like it'll be a blast).
