Pop sheep - best funny cool game for kids

How to play:
Just tap two or more sheeps of the same color.
The more sheeps cleared with one time, the more score you will get.

classic:
No time limit.
Save game map automatically.
Score Formula:
Score = (sheeps cleared)*(sheeps cleared)*5
Bonus Formula:
Bonus = 2000 - (sheeps remain)*(sheeps remain)*20

Timing:
60 seconds every round.
spend 20 coins, win 0 - 150 coins.