Speaking broadly on just pixelling as a function in-game, I got my wife Picross DS and it alllows you to pixel your own puzzles - 10x10, 15x15 or 20x20 - and then pixel a larger (I'd guess around 64x64) color portrait as a reveal shot. So you pixel the puzzle, the game automates the numbers, someone plays your puzzle and then when they solve it the higher-res pixel art is displayed. Fun little addition.