Picross Black is an Android puzzle game developed by Maum that challenges players to fill in squares on a grid based on the numbers listed above and to the left of the puzzle. The game's main objective is to solve the puzzle and reveal a drawing as a reward.

The game's puzzles range in size from 5x5 to 15x15, and it offers hints to help players who get stuck. The auto-fill feature is also available to assist players in filling in squares quickly. Additionally, the game supports tablets, making it more enjoyable to play on larger screens.

Overall, Picross Black is a challenging and addictive puzzle game that will keep you entertained for hours. The graphics are simple, and the gameplay is easy to understand. It is a great game to play when you want to test your brain and improve your problem-solving skills.