Memorize Flashing - airplanes

This game's goal is to memorize flashing airplanes and guess them.
There are 4 flying airplanes on the screen.
Among them, 3 airplanes are flashing.
Then memorize 3 flashing airplanes.
If they stops moving, touch previously flashed airplanes.
According game level goes up, appearing airplance count goes up.
This will be a chance to test your memorizing ability.
Memorize flashing airplanes with your instantaneous concentration ability and touch them.
Exert your surprising memorizing ability.
What will be your memorizing score?
How about escaping from normal things and focusing on this game?
Expect this game relaxes your body and mind.
Compare your score with other's in global leaderboard.