The free version of Amusewares super-fast Triple Yatzy game. Because of the "Magnify scoring" option, it is easy to touch a single scoring box (even on the smallest iPhone) to score your turn.
Play against computer opponents (there are 7 built in to the game) or against other human players (or by yourself).
See statistics like the Top 10 scores and the Standings. Many options like "fantasy" mode which gives an advantage to the human player, and a volume control option for the sound effects.