I am going to show you a game. It costs about a buck on the Play Store and is very fun. However, once you begin playing it, you will have roughly five minutes until you either scream, demand a refund, or your head explodes. There are no other options. The game is called Puk. And it is insane.
The concept is simple. At the start of each level, you are given a set number of slingshot-able pucks (I get it!). You have to hit a number of large white circles on the play field with said pucks (...ohhh. Now I get it.) before time runs out. Sounds simple? You know nothing!! Some of the circles have to be hit more than once. Sometimes the puck gets stuck on the main board and you have to shake to get it to move or you lose! Sometimes it bounces all the way back into the starting area and you can fling it again. Sometimes your brain screams for you to stop.
This game is extremely fun, but in the interest of full transparency, there is a good chance that you will either become addicted to this game immediately, or become too frustrated to keep it up. The game is rapid and merciless. You should definitely take advantage of the 15-minute return window to see if you want to keep it. Grab it from the widget below, but don't say I didn't warn you.