Picross DS review at DS-x2.com.

"Thinking back to the classic puzzle games on the various Nintendo handhelds will inevitably lead you to the original Gameboy's Tetris, Columns or maybe even Puzzle League on the Gameboy Colour. You are unlikely to remember a little sleeper hit that was known as Mario's Picross. However, anyone that has played this game will know how addictive and ahead of its day it was."

Full Source: DS-x2.com