Pigment

Pigment is an educational yet challenging puzzle game

If you think that this kind of puzzle games are only for kids, I recommend you to give this one a go. It's true that first levels are easy: since there isn't any tutorial, best way to make you learn gameplay is by setting "introduction" levels. However, difficulty increases as you progress and you'll have to rack your brain to solve them.

In Pigment players have to connect color spots by drawing lines between them. There's a grid board and players can use as many cells as they want. Be careful though: leave enough space to draw lines to connect the others spots. This can seem quite easy if it wasn't because if one line cross another, color will change: for example, if a blue line cross a yellow one, it will switch to green (as a mix of both).

Graphics aren't awesome (there's no need), however, the game is highly challenging and addictive. I'm still begging for more levels.

There are up to 30 levels in this demo version (just 2 out of 6 worlds) and some bonus levels. Pro version unlocks all 6 levels and its 90 levels.