In the circular tray in Last One Lost — previously released as Last Mouse Lost and Pop It — players confront six rows of raised bubbles, with each row holding 3-6 bubbles. At the start of the game, all of the bubbles protrude from their holes. Taking turns, each player selects one row with one or more upraised bubbles and presses one or more of those bubbles to leave only holes. Whoever presses down the final bubble loses.

Once you finish a game, you can flip the tray to the opposite side, and you're ready to play again immediately!