Twelve scientists settle their disagreements in the arena. Each one fights with their own field: the Meteorologist throws lightning and rides the wind, the Radiochemist irradiates you, the Mycologist roots you to the spot, and the Astrophysicist bends gravity round you.

Read the guard. Lock on, and your guard goes left, right or top with a flick of the mouse. Block from the side a blow comes, parry it just before it lands, break a guard that will not move, and dodge your own fighter's way. Fill the Ultimate Catalyst and finish it in style.

Ten arenas. Syracuse at sunset, a particle collider, a volcano's caldera, a coral atoll, a dome on the Moon, a mountain summit, a station on the sea floor, a court among giant redwoods, a station under a black hole, and the inside of a living cell. Possibly more in the future!

Play your way.

• Science vs. Machine: bots on three difficulties, one against one or two against two, with a tutorial to start.

• Casual and Mayhem: Mayhem hands every fighter a new rule-breaking modifier every 15 seconds.

• Ranked: climb the periodic table from Hydrogen, one proton per win, on a solo ladder and a two-player one.

• Private matches: a five-letter code or a Steam invite, and friends can watch.

• The Laboratory: a beach field station for up to 20. Walk about, chat, emote, and challenge anyone to a duel while everyone watches.

Built for online. Both players run and host the whole fight and only your button presses travel, so your own moves never wait for the connection.

Free, and fair. Every mode is free. Four fighters are yours from the start and the other eight are unlocked with Research, earned by winning. Skins come from the Synchrotron (for Research) or the Shop. Nothing you unlock or buy changes a single number in a fight!

Real science. Every fighter, arena and skin carries a real fact, from Cherenkov light to the speed of a karate strike.