Games that are excellent but remain largely unknown! And I mean properly obscure games, not something that didn't sell well but most reasonably knowledgeable gamers will be aware of.
Movod II
also System's Twilight, for that matter
bump for the Choro Q series. (also localised under various titles like Road Trip, Gadget Racers, Penny Racers, Seek and Destroy or just ChoroQ)
Hard Hat Mack
Idol Janshi Suchi-pai.
The most fun mahjong game out there - character designs by Ken'ichi Sonoda, cute but meaningless plot events, and all sorts of weird cheat powerups you can use. (Your opponent draws a winning tile? Scorch it blank with a fireball! ha!)
narcissu ~