Almost everyone knows sudoku and kakuro.
But there are many other great logic puzzles.
In the Netherlands we call them 'Japanse Puzzels'.
Other names are Paint by Numbers, Nonogram, Griddlers, Pixel Puzzles, Tsunami,.....
Pic-a-Pix puzzles are based on a grid with a pixilated picture logically "hidden" in it.
Using logic, the solver determines which squares are filled in and which should remain empty until the hidden picture is completely exposed.
you find samples and an online tuturial