Doom (32X)/Hidden content
From Sega Retro
- Back to: Doom (32X).
Pause the game and press 
+
+ MODE +
. This will max out the player's health and armor, give him/her all three cardkeys and give a full set of weapons, each with maximum ammo.
Pause the game and press 
+
+ MODE +. This will make the player invincible.