In the game Endless Siege, you set up turrets throughout a pathway. A wave of enemies is released into the battlefield and your turrets are supposed to beat the enemy as it walks by. For every enemy eliminated you earn tokens which can be used to purchase more turrets. The further you go into the game the more enemies you'll face and the tougher they'll be. The enemies get bigger and tougher so you'll need to really strategize as ou get deeper and deeper into the game. This is an amazingly addictive game that will give you fun for hours. It also gives you the option to pause the game if a break is needed. Your score is kept in the upper left hand corner and continues to rise as you defeat more enemies.