Zangeki no Reginleiv is an action game based on the Ragnarok story of Norse mythology. Two siblings, Frøy and Freia, serve the Norse gods, battling the Kyoshin Army giants that are invading Midgard.

Players run around a the battlefield, fighting the giants. Using their weapons, players can target specific enemy body parts, slicing off limbs and heads with much bloodshed. Other adventurers can be recruited to fight the giants.

The game is controlled via Wii MotionPlus in combination with the Nunchuk or Classic Controller. A blue line appears on the screen to show the player exactly where their slices will hit. The game also has cooperative online play via Nintendo Wi-Fi Connection, so players can play with other players from all over Japan.