Nonogram, Paint by Numbers, Griddlers, Pic-a-Pix, Picross, Hanjie, Logic Art!
Call it what you want but you are always really pushing the boundaries of your brain when solving these graphical puzzles. Nothing makes you feel smarter than filling in those squares that, by process of elimination, have to be filled.
The goal of picross is to find out the positions of the right blocks from the grid using the hints presented in the edges. There's always an image hidden in the grid and your job is to find it. More information about picross from http://en.wikipedia.org/wiki/Nonogram
Griddlers Picross has 3 difficulty levels: 5x5 , 10x10 and 20x20
The first two are really fun and the last one will really make you think. You can have a few false guesses but get too many and it's game over.
To help you solve these puzzles you can mark the blocks that you think are not correct or you can try and beat this game without using the mark feature.
Griddlers Picross is made by Qperience and published by SnowGrains