Fifty

This game, for two or more players, is one of the simplest dice games. It requires two dice, and the winner is the first player to score 50 points.

Each player in turn rolls the two dice, but scores only when identical numbers are thrown (two 1s, two 2s, and so on).

All these doubles, except two 6s and two 3s, score 5 points. A double 6 scores 25 points; and a double 3 wipes out the player's score, and he has to start again.

From 'The Official World Encyclopedia of Sports and Games'
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