Here are some cheats and tips for the game Yoshi.
003-BBE-193 At random intervals, 1 block comes down instead of 2
3EC-70D-081 + 06C-71D-2AC + 22C-72D-F71 When setup screen appears,
go to level select, push right once to start on level 6
3EC-70D-081 + 08C-71D-2AC + 22C-72D-F71 When setup screen appears,
go to level select, push right once to start on level 8
00C-71B-3BA No timer for game B