Hit "Start" and you will see a large grid of numbers. A question will be presented at the bottom of the screen. Choose numbers to fill in the formula and complete the equation. Click "Submit" to check if your equation is valid. If the equation is correct, the numbers you picked will be removed from the grid, and you can proceed to the next question. If the formula is wrong, 5,000 points will be deducted, and you need to click the "Reset" button above the equation to fill in the blanks again. The time you have spent will be recorded at the top of the screen.