Mister Viking is a Viking-themed vertically-scrolling shoot 'em up game where you take control of a Viking searching for the lost treasure of his people.
As the character makes progress he has to fight of creatures who walk or fly in the screen from all directions. The player has the ability to shoot in all directions to fend them off. To aid the player a bit a Viking ship occasionally appears to drop special weapons like bombs and swords that can be thrown at the enemies. Some buildings also yield these special weapons when destroyed. The game can be played solo or with a friend in alternating turns.