Play ULTRAKILL as V1, with all its dashing, sliding and speed, holding DOOM 64's guns.
- DOOM 64 guns on screen. Revolver → Pistol, Shotgun → Shotgun, Jackhammer → Super Shotgun, Nailgun → Chaingun, Railcannon → Unmaker, Rocket Launcher → Rocket Launcher, and punches throw DOOM 64's fist. You get the firing frames, muzzle flashes and weapon bob.
- DOOM 64 gun sounds replace ULTRAKILL's for every shot, punch and rocket.
- DOOM 64 status bar shows health, stamina and style points in DOOM 64's red numbers.
- The DOOM 64 arsenal in every shop. Each ULTRAKILL shop terminal has a DOOM 64 page with all 9 DOOM 64 guns: Chainsaw, Pistol, Shotgun, Super Shotgun, Chaingun, Rocket Launcher, Plasma Rifle, BFG 9000 and Unmaker. Pick the ones you want and they go in weapon slot 6 (press 6 to cycle). They fire like DOOM 64, with bullet puffs and blood, rockets, plasma and BFG balls with DOOM 64 explosions, and the Unmaker's piercing laser.
- Explosive charge on every DOOM 64 gun. The secondary fire is ULTRAKILL's own explosive core from the Shotgun's Core Eject: hold right mouse to charge, then release to throw it. The longer you hold, the farther it flies. It blows up enemies and breakables like the real one, so you can finish levels with DOOM 64 guns.
- The Chainsaw kills any enemy in one hit.
Solo. ULTRAKILL's levels, enemies and movement are unchanged.
Needs ULTRAKILL and DOOM 64 (2020). Every DOOM 64 sprite and sound is read from your own copy of DOOM 64 while you play, and nothing from either game is included in the download.