Presented with vibrant, cel-shaded aplomb, When Vikings Attack is essentially a game of crowd-versus-crowd control. You maneuver a cluster of portly citizens, brought together in the face of an inexplicable, anachronistic viking invasion of 1970s England. The number of people in your crowd is an indicator of your speed, health and strength, and more able bodies can lift larger and heavier objects.
That's right: the secret to thwarting the Norsemen of the apocalypse is to pick up the manufactured detritus of civilization, such as benches, cars, ambulances and phone booths, and hurl it at incoming streams of invaders. It's a bit like bowling, with mismatched, costumed people for pins, and balls coming in every shape, size and seriously you can throw everything at everyone.