Cross Virus

This game is the 19th iOS game for the Web game site "DAN-BALL".
Game to be enclosed by a block, virus to grow in a cross direction.

You can place blocks in the locations that you have touched. Viruses can’t grow where there are blocks. After you have placed three blocks, the viruses will grow. It is the end of the game when a virus can not be growth. Place the block so that the number of virus is minimized.