Hexen

Enable cheat menu:
Press Start to pause game play. Press C-Up, C-Down, C-Left, C-Right. A cheat option will appear at the bottom of the menu.

Invincibility:
Enter the cheat menu and immediately press C-Left, C-Right, C-Down. The sound of rushing air will confirm correct code entry.

Level select:
Enter the cheat menu and immediately press C-Left(2), C-Right(2), C-Down, C-Top. The sound of rushing air will confirm correct code entry.

Kill all visible enemies:
Enter the cheat menu and immediately press C-Down, C-Up, C-Left(2). The sound of rushing air will confirm correct code entry.

Full health:
Enter the cheat menu and immediately press C-Left, C-Up, C-Down(2). The sound of rushing air will confirm correct code entry.

Walk through walls:
Enter the cheat menu and immediately press C-Up(20), C-Down. The sound of rushing air will confirm correct code entry.

All keys:
Enter the cheat menu and immediately press C-Down, C-Up, C-Left, C-Right. The sound of rushing air will confirm correct code entry. Enter the collect menu to activate the code.

All artifacts:
Enter the cheat menu and immediately press C-Up, C-Right, C-Down, C-Up. The sound of rushing air will confirm correct code entry. Enter the collect menu to activate the code.

All weapons:
Enter the cheat menu and immediately press C-Right, C-Up, C-Down(2). The sound of rushing air will confirm correct code entry. Enter the collect menu to activate the code.

All puzzle items:
Enter the cheat menu and immediately press C-Up, C-Left(3), C-Right, C-Down(2). The sound of rushing air will confirm correct code entry. Enter the collect menu to activate the code.

Hint: Hidden rooms:
Many of the levels in the game contain hidden rooms. To access them easily, enable the "Walk through walls" code. Then, leave the main rooms and look for rooms that are cut off from the main level.
Information in this section was contributed by PimpDogg84.

Hint: Last level:
Once you open the second door, dodge the green flames. Switch to a more powerful weapon and watch out for the spikes.
Information in this section was contributed by Jacob and Becky Ellis.

Glitch: Early progression:
There are three sets of stairs that must be raised in the center of the hub to progress through the game. Raise the first set of stairs and climb up halfway. The platforms that the other stairs will eventually reach will be visible. Try jumping from the current location to the lower ledge to skip part of the hub and progress through the game earlier than normally possible.
Information in this section was contributed by megacortex.

Glitch: Falling after game restart:
Save the game before a jump. When such a game is reloaded, your character may be in mid-jump and end up falling. Press Analog-stick Down while the game loads to try to prevent this from happening.
Information in this section was contributed by megacortex.