How players use Jak's DEBUG mode
konami code on stereoids
/ scorpaxtm
While holding L3, press Up, Up, Down, Down, Left, Right, Left, Right, X, X, Square, Circle, Square, Circle
While holding L3, press Circle, Square, Circle, Square, X, X, Right, Left, Right, Left, Down, Down, Up, Up
In Jak2 you need to do the 2nd part while in a menu