Complete the game once to unlock both Hard Mode and the Secret Room. Both will be appear on the main menu.

• Skimpy: Complete the game.
• Alternate Dog: Complete the game.
• Alternate Enemies: Play the game on Hard mode.
• Cowboy: Complete the game.
• Frog: Complete the game on Hard mode.
• Stuffed Dog: Complete the game on Hard mode.

Instead of typing "METH", type "EMETH" at the very first card slot in the game. A different cutscene will be seen, then look on the floor in front of the door and you'll find a useful Obsidian Choker.

In the mausoleum area of the game (mid-way through) there is a golem that turns in response to the commands cut into the mimeograph (typewriter). Create a keyplate with the letters SALTATIO for an interesting effect. You may want to save the game first.