You have until the count of 5 to memorize the arrangement of the numbers 1 to 9. You then have until the count of 10 to press the buttons in order. If you get one wrong, the round will start over from the current time. When the timer reaches 0, the game is over. Each round will get faster!
Game play is super simple, but you'd be surprised at how challenging it can be, but also how addictive it can be to try to get the order right, before the time out.