ESPN X Games Skateboarding
Level select:
Press Up(3), Down(3), Up, Down(3), L1, R1 at the title screen.
Big head mode:
Press Up(3), Down(3), Left, Right(3), 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.