To unlock the Tranquilizer Gun hidden game, complete any mission.
Extra Level
Collect ALL pictures, use no continues and complete all missions.
Extra Missions
Beat the first three missions without running out of continues, and you will get Missions 4, 5, and 6 to play. These Missions are in the same areas, but they are extremely challenging.
Infinite Credits and Tranquilizer Gun
To unlock Infinite Credits and the Tranquilizer Gun complete mission 1, 2, 3 with out using any continues.
Infinite Tranquilizer Credits
Beat the first three missions without running out of continues and you will get unlimited credits on the tranquilizer gun game.
Play as Bruno from Die Hard Arcade
To play as Bruno from the orignal Die Hard aracde collect all the Picture Frames in the game to unlock Bruno from Die Hard Arcade.
Play as Cindy
To play as Cindy from the original Die Hard Arcade select Ivy and hold Start.
Unlimited Ammo
Pause the game and press L+A+B+Y. Un-pause it and then the ammo is unlimited for every weapon.