diffuculty ui button could have set invalid icon regarding difficulty level, this has been fixed
also difficulty description has been made even more descriptive so player will know wjhat to expect.
New hint option for rotated pieces.
Playing at NORMAL and DIFFICULT levels will be backed by "rotation hint".
The more piece is far from valid orientation the more red outline of the selected piece will be.
If piece is rotateed towards valid rotation, outline color will shift towards green color.
If piece is at the correct orientation ( inside given threshold value ) outline will be turned off.
From now on, all you have to do is to find correct spot :)
With this update this game is finnaly playable by me :D

Many thanks for playing :)
Adam
