Picture On

Picture On is a logic puzzle game with 25 levels.
The goal is to reveal the picture. The rules are very simple. There are 25 tiles on a 5x5 grid.
To complete a level you must flip them round so they all face up.
Each tile can be flipped by touching it.
Adjacent tiles will also be flipped.
There is always a solution and using logic, one can deduce the minimum number of flips to complete the level.