Play as Solid Snake:
     Complete  100%  of  the  game  (get  all  coins) with all default
characters to unlock Solid Snake as a skater.

All Characters/Big Heads Code:
     Up, Down, Left, Right, Up, Down, Left, Right, Up, Down, Left, Right, O

All Stages Code:
     L2,  R2,  Left,  Right, Left, Right, Left, Right, Down, Down, Up,
Up, Down, Up