Object: To collect tokens and adjust the values of variables to end with the highest value.
Set-Up: The game board is a series of ramps with doors, each of which may be opened or closed. Each player's holding bin is shown, which initially contains three coins. At the bottom of the screen are two treasure chests, one representing the value of x, the other representing the value of y
Play: There is a cost to open or close each door on the game board. On each turn, you may open or close any of the doors using the coins in your holding bin, provided you can afford it. Once you've opened or closed the doors that you want to, press the Start button.
A ball will then be released onto the top ramp, and tokens will be collected as it rolls. The doors you've opened and closed will dictate when the ball drops to a lower level. When the ball reaches the pool below, your turn is over.
The collected tokens will be moved to your holding bin. Note that the space in your holding bin is limited, and if the ball rolls over too many tokens, not all of them will be collected.
Once your turn is complete, you may then combine coins. Drag coins with like terms to the Combination Area, and then enter their combined value. But be careful! If you make a mistake, those coins will become locked — you will not be able to combine them for the rest of the turn (though you may still use them to open and close doors).
If you've collected any power coins (the gold +/- coins), you may apply them to the treasure chests for x and y at the bottom of the screen. Although the exact value of x and y will remain unknown, the adjustment to be applied at the end of the game will be noted on the treasure chest. For instance, if a +2 shows on the chest for x, the value of x will be increased by 2 at the end of the game.
The game ends when both players have taken five turns.
Winning the Game: At the end of the game, the secret value of x and y will be revealed, and any adjustments based on the power coins will be applied. The values of the variables will then be applied, and the winner is the player whose expression has the higher value.