Defend the Highlands combines the genres of Tower Defence, Real Time Strategy, and Scotland. The player will have to build defences, recruit Scotsmen and manage their porridge stockpile as they fight off the English invasion of Scotland. The player will control a band of Scotsmen, led by the short, hairy and nationalistic pub owner Alfredo.

Making use of traditional Scottish weaponry, such as golf clubs and haggis catapults, the band of Scotsmen must defend locations around Scotland, Wales and England, as they defend their homeland, and then take the fight to the enemy.