The goal of Top 15 is to align 15 counters ascending from 1 to 15. The quicker player wins.
Each player gets a small board with 3x 5 pits where the plastic counters will be placed face down (well mixed before). Ready, set, go! Both players are allowed to look the number of one counter and then to put it back. Only if they find the number one they may put it into a guideway to mark progress. Then they go on with number two, three etc.
To make it more difficult, players are only allowed to use one hand (the other holds the board).
This game was designed to train memory skills as well as fine-tune motor abilities.