Color Zen

Color Zen is a puzzle game about combining items to turn the game area into a single colour. A typical level is filled with objects with different colours. The pulsating ones can be dragged into another one to combine them, filling all the available background with that colour. By doing that with multiple objects the entire area can be cleared. There is a catch however as the final colour needs to be the one of the area's border, already shown at the start of the game. That way, the challenge is...