Thimbles

The game for attention and concentration.
There are three variants of it:
1) there are 3 thimbles in the game. Before starting one thimble is marked and then all the thimbles are
mixed. Player should trace and choise the thimble that was marked (classic variant)
2) Also 3 thimbles in the game. Their order is marked by number. After the thimbles are mixed the player
should choise them in right order.
3)The classic game (1) + you should select the correct answer to the simple arithmetic example, which
appears for short time, during thimbles mixing.

The are two game modes:
a) free game ("training") - where player can choose complexity and play one of three variants of the game,
earning points.
b) game ("game") - there are ten steps for everygame variant, with fixed raising of complexity.