Flood Fill 2

Flood Fill is a great puzzle game with a colorful and a fresh design.
The game rule is quite simple.
Color the shapes within four color so that neighbors dont have the same color.
Using 4 colours to fill the picture and dont let the colours touch together.

In this game the goal is to fill in the pieces with at most 4 colors. Two pieces that touch can’t share the same color. The game is mathematically interesting since the Four Color Theorem says that for any such ‘map’, four colors is enough.