When starting a level, you can check your energy timer. One Paw of energy is required to play each level. When you are out of energy, you have to it to recharge or purchase more. Paws recharge at a rate of one every ten minutes. To see your current recharge status, enter a level and examine at the "Entry Fee" box. It lists how many paws are required to play that level, and the bar below it shows how many paws you currently have. Each filled silver box is one paw, and each empty gray box represents a paw that has been spent. The leftmost empty gray box shows the current charge as it slowly fills with light gray. If you have no paws remaining, a countdown timer will appear, showing the amount of time needed until you get your next paw refill.