A little strategy. Three darts. Double out.
Pick a square. Check out its number. Claim an X.
Three chances per square. Three X's in a line to win.
Your next move
Choose any empty square to reveal your checkout number.
Your board is ready.
Finish on a double, using no more than 3 darts.
This is a game of Tic-Tac-Toe where 3 X's in a row (horizontal, vertical, or diagonal) wins the game. If your "opponent" scores 3 O's in a row, you lose.
When you select a square, you will be given a score to "Check out", like in a game of 501, ending with a double. You have 3 chances to successfully complete each number with 3 darts. If you hit it, you get an X in that square. If you miss with all 3 chances, your opponent gets the square and the square becomes an O.
Easy: 2–60 / Medium: 45–100 / Hard: 60–140