The most fun you can have mining acheviements.
Basically, you play as BK's Egnimatic mascot, The King, on a quest to quell the hunger of the denizens of his realm. After about 10 minutes, this premise runs very thin. You are given several challenges to complete, such as delivering a certain amount of food in a given time, and that's all the variety this game has to offer.
Still for anyone looking to pad their gamerscore, and anyone looking for a hot meal and four bucks to spare, this game's qurikyness and charm is worth a buy.