Level 16 stage 3, i was waiting to win this one in order to write a review but lets go.
The game is awesome. There has been some changes as i saw it (more seconds at ext.selection time) that made the game a bit easier. still challenging.
Here is the secret i use: Look at the screen at the middle, when the tiles flash, even when they are later turned again, your mind will fill the tiles with a negative color (black).
So its like selecting tiles while you see them.
Be fast, for the effect ends fast.
Dont stop looking in the middle.
4 Stars!