Completion bonuses: Successfully complete the game to unlock the hard difficulty
setting. Start the game again on the cleared game file to begin
with the Ruby Key and a brass heart icon next to your saved game
file. Use the Ruby Key to unlock the door to the right of the
lobby to access the "Thou Art Dead" arcade game.
Doom Bringer 3000: Get over 50,000 points in the Thou Art Dead mini-game.
A passage way can now be accessed, which leads to a chest that
contains the Doom Bringer 3000 water gun.
