CheatCC says, "Viking Invasion is a very solid title on the DSi. The touch screen interface for building turrets and buying upgrades works incredibly well and just feels right. Being able to pause the action is a great addition that not only allows you to better keep up with your foes, but it also lets you put more thought into turret placement and strategy. While the campaign is a little short, the survival mode and different difficulty levels help to add some replayability to the title. So if you like the tower defense genre or are just looking for an enjoyable DSiWare game, Viking Invasion is definitely worth checking out." 3.6/5