Sly 2 Demo:
Title Screen Menu
Hold L1, L2, R1, and R2

Wrench Replacement:
Pause Menu
Circle, Square, Circle, Square, Up, Down, Left, Left

Wrench Replacement (Japan):
Pause Menu
Right, Right, Down, Up, Up, Down, Left, Left

Santa Ratchet Skin (Japan):
Pause Menu
Up, Down, Up, Down, Square, Square, Square

Bombs Away! Minigame:
Vidcomic Select
Square, Enter "YING TZU"

Pirate vs. Ninja Minigame:
Vidcomic Select Menu
Square, Enter " MEGHAN "

Qwark Tutu Skin:
Vidcomic Gameplay
Up, Up, Down, Down, Left, Right, Circle, Square, Square

Squat Stats:
Online Menu
Highlight "Stats", Up, Down, Left, Right, Square

Dan Skin:
Edit Profile Menu with "Smithy Jones" as your Username
Hold L2, Press Up, Right, Right, Right, Down, Right, Down, Up

Nefarious Skin:
Edit Profile Menu with "Smithy Jones" as your Username
Hold L2, Press Right, Left, Right, Down, Up, Right, Left, Up

You can find this game's playlist here.
   • Ratchet & Clank: Up Your Arsenal (PS2)