All hidden games
Highlight the "Start" option at the title screen, then press L2, R2, R1, L1, Select, Start to unlock Elevator Action, Front Line, Gun Frontier, New Zealand Story, and Qix.
Elevator Action
Accumulate at least one hour of game play in Cadash, Arabian Magic, Violence Fight, Rastan Saga 2, The Legend Of Kage, Chack'n Pop, Mizubaku Daibouken, and Wild Western.
Gun Frontier
Accumulate at least one hour of game play in Insector X, Gekirindan, G-Darius, Raystorm, Space Invaders, Akkanvader, and Space Invaders Part 2.
Qix
Accumulate at least one hour of game play in Crazy Balloon, Puzzle Bobble 2, Raimais, Hat Trick Hero, and Balloon Bomber.
All hidden games...