Level select
Press [Up]x3, [Down]x3, [Up], [Down]x3,
[L1], [R1] at the title screen.
Big head mode
Press [Up]x3, [Down]x3, [Left], [Right]x3,
[L1], [R1] at the title screen. Alternately, Get 30
licenses in arcade mode with any character, then press [Square]
+ [X] at the character selection screen.
Another arcade mode
Get all 36 licenses in arcade mode, then press [Circle]
at the stage selection screen.
Additional characters
Hold [R1], [R2], [L1], or [L2]
at the character selection screen.
Additional boards
To get secret boards, complete X Games with a gold
five times in a row. Repeat this to keep getting new boards.