Start a game in single player mode. Then while playing the game, enter one of the following codes:
Invincibility: jjinv
All weapons: jjguns
Full ammo: jjammo
Level skip: jjnxt
Sugar boost: jjrush
Power shield: jjshield
Fully light level: jjlight
Bird help: jjbird
Coins: jjcoins
Gems: jjgems
Quit to desktop: jjq
Power-ups: jjpower
Pass through obstacles: jjnowall
Commit suicide: jjk