Skeeball is a simplistic game to which I have both the HD and non HD versions. Simply put, you toss your balls and try to get the best score. As you play game after game, you have the option of earning multipliers, which build up until you are getting more tickets and higher scores.
In order to curve the ball, you tilt you ipad left or right and it will cause the ball to curve in that direction. The re playability of the game comes with tickets. As you earn tickets, you go to the store. Each time you go to the store, a random list of toys appear. Some of them are rare and only rarely appear, others are very common and always appear. You also have the option of buying balls, which you can then change so that you are throwing new balls. An addition to the HD version gives you the ability to purchase new lanes as well.
Each time you play, a new list of toys appear and your job is to collect them all. If the toy you want isn't available, you go play another game and try again. If you lack enough tickets, then you go earn tickets and come back again.
My wife loves skeeball and is absolutely addicted to this game. My son also loves playing it, as one of the few games a child his age actually can play and play well. For a simply $1-2 game, it is well worth the price for anyone who likes collecting and unlocking things or skeeball for free.
My only complaints, which keep it from being the +5, is that they decided to jump on the inapp purchase bandwagon with the HD version and now sell extra balls/lanes/rare gifts at a $1 a piece, 4 packs in all. I really hate it when applications do this stuff, and it feels like a complete rip off on an app you already paid for. My other complaint is the curving by tilting can be frustrating if you are not perfectly strait, and leads to a little bit of unrealistic tendencies. They really should offer different ways to curve the ball, such as arrows to line the curve like in bowling games, or the ability to arc your finger to create spin.