This would be a fun game if you fixed a lot of things with it.
First, add sound some music and sound effects.
Second, the computer is WAY too hard. I played a game of 301 and the computer only threw one single dart that wasn't at least a 20. Most of its darts were worth 50 points. Also, on it's last throw, the computer needed 31 points to win. It hit a double bullseye worth 50 points and won. That's not how the game is played. If you go over, your score is reset to whatever it was before your last round of throws.
Last, add Cricket to the game list. That's the only dart game worth playing. ;)