Pirate's Treasure

This is an an ancient math game.
Take gems in turns, and the one takes the COIN lose the game.

The concept is easy to understand. Easy to use.
Just drag the gems into the box.

**But! This puzzle is very very difficult to WIN!**

You can setup the number of gems, choose who go first.
It is a fair game, it's all about the secret of the math, can you find it out?

This game also provides a mode that you can play with your friends, on one device.
Once you find out the secret, play it with your friends will be very funny!