If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
NNNumbers is just a simple but yet thrilling game about reaction. Hover 8 numbers in the right order to survive each round of the game. If you're able to reach round 16 or 17 you're a master... ;)
Hover numbers 1 to 8 with your mouse in the right order.