MJK Games has released the full version of Picross Mania for free. Actually it looks like they released it a while ago but didn't post it on the main page because they were testing for bugs. This is a good game to play whenever you have free time. You can just listen to the music and relax, there's no need to rush. This game was also updated to include all the downloadable level packs.
Three game modes: Challenge, Time Attack and Custom Level. Test your abilities and proceed towards the most challenging levels, or play unlimited amount of random generated puzzles. Download more picross fun or make your own levels. Compete with your friends and other players in online high score boards. Picross Mania is the ultimate picross experience.
The type of puzzles in this game is called a nonogram. The objective is to fill in squares on a grid to form a picture based on the given clues. Each row and column is labeled with numbers that show the sets of consecutive filled in squares and their order. For example, "3 4 2" means there are possibly blank spaces to start, a set of 3 filled in squares, blank spaces, 4 filled in squares, blank spaces, 2 filled in squares, and possibly more blank spaces to end. By successfully using these clues to solve the puzzle, you are rewarded with a picture which makes the game fun to solve.
Controls:
Left mouse button: paint a block
Right mouse button: erase a block / mark it empty
Middle mouse button: enter a question mark
Wikipedia article on nonograms and how to solve them:
http://en.wikipedia.org/wiki/Nonogram
Download (5 MB):