• TNTWEAP followed by a weapon number gives or removes this weapon (8 = Chainsaw, 9 = SSG). Try to load Doom 1 with DOOM2.WAD as a PWAD and type TNTWEAP9 to play with the SSG in Doom 1.
• TNTWEAP0 takes away all weapons and ammo except for the pistol and 50 bullets.
• TNTEM, KILLEM or FHHALL kill all monsters on the current map (and disables all cube spitters).
• SPECHITS triggers all Linedef actions on a map at once, no matter if they are enabled by pushing, walking over or shooting, or if they require a key. It also triggers all boss monster and Commander Keen actions if possible.
• NOTARGET or FHSHH toggle deaf and blind monsters that do not act until attacked.
• TNTHOM toggles the flashing HOM indicator (disabled by default).
• SHOWFPS or IDRATE toggle printing the FPS in the upper right corner.
• NOMOMENTUM toggles a debug aid for pixel-perfect positioning on a map (not recommended to use in-game).
• GOOBERS triggers an easter egg, i.e. an "homage to an old friend". ;-)
• IDBEHOLD0 disables all currently active power-ups (since 2.2).
• IDCLEV00 restarts the current level (since 2.0).
• IDMUS00 restarts the current music (new in 5.1).
• VERSION shows the engine version, build date and SDL version (new in 5.1).
• SKILL shows the current skill level (new in 5.5.2).