Color Trail

Place blocks that have 2 paths on 4x4 tile and connect same color.
The longer the connecting path is, the more score you get.
Used paths are deleted, and used colors are changed.
Placed blocks that has no paths are deleted and you can place a block again on that position.
By getting many score, you can earn REPLACE POINT for replacing a placed block with a new one.
If there is no space for placing a block and no REPLACE POINT, the game is over.