Complete the game 100% (all coins collected) with all the default skaters and 1 edited skater, then highlight the respective character and press X to play as these special characters:

Character - Code

Frogger - Steve Williams
Gorilla - Arto Sarri
Grey - Edited Skater
Gurlukovich 1 - Rick McCrank
Gurlukovich 2 - Chris Senn
Raiden - Mark Appleyard
Solid Snake - Colin McKay
Unknown - Danny Way
Vampire Killer - Kerry Getz

If you have any information regarding the unknown character, please notify us.