Jeremy1026 has released a Yahtzee game for the PSP in the forums. Yahtzee is a game where you can score points by rolling certain combinations of numbers with five dice. You must roll at least a three of a kind of all six die face values (or an equal to or greater score of other combinations so that the total is at least 63 points) to achieve a bonus, and must further attain certain Poker hands such as four of a kind, full house, and straight. A Yahtzee is five of a kind.

Just unzip 'yahtzee.zip' and copy the folders in the '1.5' folder to x:/PSP/Game/. When you're done with that you're ready to start rolling those dice.

Instructions
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Select "Yahtzee" from the PSP browser (under Game->Memory Stick.)
At opening screen press 'X' to start the game.
Roll the dice with 'Circle'
Select which die/dice you want to hold with 'Up', 'Down' and 'X'.
After your third roll you will have to select where to score your final roll.
Select what category you with to place your roll with 'Up', 'Down', and 'X'.