Magic Square Ultimate is a free puzzle game developed by ssm for Android devices. The game is a math puzzle that requires logical thinking and basic arithmetic skills to solve. The objective of the game is to complete a magic square, a grid of numbers where each row, column, and diagonal adds up to the same number, known as the magic number.

The game provides the player with two number grids, one in the upper side as a puzzle grid and the other in the lower side as numbers to solve the puzzle. The player needs to fill the puzzle grid in such a way that it forms a magic square, with the magic number given at the top. The game offers puzzle grids of three sizes - 3X3, 4X4, and 5X5.