There's a new Doomslayer in town and he's just as furry as he ferocious. A neuroscientist from Budapest, Hungary has trained his three pet rats to play Doom 64, proving just how intelligent--and lethal--these little critters can be.

According to The Daily Mail, scientist Viktor Toth began the process by constructing his own VR setup for the three rodents, aptly named Carmack, Romero, and Tom after the original Doom's creators. Toth did this by placing the rats on a moving ball in front of his computer screen, allowing them to play Doom in first-person. The three rats started off small with their training, playing only games with long corridors and simple layouts. Once it seemed like they had gotten the hang of it, Toth introduced more complex layouts, filled with dead ends and random turns.

"Rats can be taught very complex tasks and I wanted to teach them to move in the right direction of the game without me interfering." Toth said.