Starting the app you will see 5 numbered discs that are going to be animated to their places randomly. These discs need to be linked in ascending order. The app has 3 modes:Practice,Countdown and Memory. I offer the 'Practice' mode at first use or for kids. Pressing the 'Countdown' button you can set time(seconds) while the discs should be linked. In the case of success a firework animation is coming otherwise the chaos. Regarding the 'Memory' mode: The point is while the discs take their position the numbers are disappearing. Have you got good memory? So you can take competition with your kids or friends. How to link the discs? Disc1 – down your finger, drag your finger to Disc2,Disc2-up your finger Next:Disc2-down your finger,drag your finger to Disc3,Disc3-up your finger. And so on. If you have failed you will see a back animation that takes 2 seconds. (Under the'new arrangement' button the surface is scrollable. You can read the rules mentioned before.) Enjoy the app!