Use all four numbers, and the operations available from the buttons below, to make an expression that evaluates to 24. Click a button to add an operator tile, and then build up expressions by dragging the tiles on top of each other in the shaded area — the borders will turn red when combination is possible. (You can also drag two numbers together to join them.)

You can continue to play after the "This round" timer reaches 0, but will not be awarded any points for the solution. If you hit New without solving, you will get new numbers, but the timer will not reset. There is always at least one solution for any set of numbers shown.

For easier play, restrict the operations to addition and subtraction only.