RTX Red Rock

Go to the options screen, and select "Codes" after enter any
of the following codes bellow. A message will appear if the
game accepted the code.

Level Select:
Down, Left, Left, Down, Left, Down, Right, Down, Left, Down
Hold R at the main menu to select level.

Extra Special Features:
Left, Down, Up, Left, Right, Up, Down, Left, Right, Down

Bonus Items:
Right, Right, Right, Right, Right, Left, Left, Left, Up, Up

Better Weapons:
Right, Up, Down, Down, Up, Right, Right, Up, Down, Down

Unlock Easy Mode:
Up, Down, Down, Down, Down, Down, Down, Down, Down, Up

Unlock Normal Mode:
Up, Down, Up, Down, Up, Down, Up, Down, Up, Down

Unlock Hard mode
Down, Up, Up, Up, Up, Up, Up, Up, Up, Down.