Crush the Castle (Android and iOS)
The name says it all here. Why fling multicolored birds at pigs if you could trebuchet rocks at royalty? This game is like chess behind the scenes, as you invade the lands and spill the blood of kings, queens and the poorly constructed castles they live in. Unlike chess, expect little mental stimulation but complete boredom relief. It's free for iOS but 99 cents on Android.