Mahjong Deluxe

A countdown clock separates Mahjong Deluxe from the more meditative mahjong solitaire games - you're still clearing matching pairs off the board, but you can't just sit and study the layout indefinitely. Power-ups and an undo button take some of the sting out of a bad match, and there are enough levels here that you'll see a good range of board shapes before things start repeating. Worth knowing going in that stalling is not really an option.