Viking Invasion

They come from the North, and they’re about to invade your Nintendo DSi
system! Beware, it’s Olaf the Viking and his motley crew! Even now,
their drakkars are sailing up the rivers to attack your castles. And it
is up to you to construct fortifications so they do not pillage
everything you own! The more you defend yourself, the more ferocious
they’ll become. Before you know it they’ll be invoking legions of
fantastic creatures straight out of the mythical land of Asgard.
Fortunately the experience you gain will help you to build even more
powerful defenses. Thwart all your assailant’s ruses and unlock new
kinds of buildings: tornado blowing windmills to repel the ships,
monoliths that strengthen your fortifications or canons firing studded
shells. Discover over ten levels, tons of units, a Campaign mode as well
as a Survival mode and three difficulty levels - there’s even a little
surprise at the end... Can you rise to the challenge and stop Olaf from
taking your treasure home to his sweetheart Olga?