Red Coloring

Red Coloring is a easy puzzle recreation wherein you want to color each coloured tile into one single shade to finish every level.

Each degree has a special goal color, indicated through the colour of the pinnacle bar at the display.
Rules are simple: You can circulate coloured tiles between white empty cells in vertical or horizontal directions (one cell at a time), or you can paint a neighbor tile by means of dragging one tile into another.