It is a game that obtains iron ball that the enemy on the screen throws out,
and defeats the throw return enemy. Iron ball that can be obtained is one
though iron ball is obtained by the automatic operation. When it hits other
iron ball with Tetstama, it is game over. If the enemy is continuously
defeated, it becomes a high score.

Operation method
Right movement:
The right side of the player character is pushed.
Left movement:
The left side of the player character is pushed.
Iron ball is thrown out straight:
It pushes on the player character.
Iron ball is thrown out right:
The upper right of the player character is pushed.
Iron ball is thrown out left:
It pushes on the left of the player character.