"Masyu - Alternate Corners Puzzle" is a logical reasoning game available for iPhone users. The game presents players with a chessboard scattered with black and white pieces. The objective is to draw a closed loop on the board that passes through all the pieces, following specific rules.

Players must navigate the loop so that when it passes through a white piece, it goes straight, and when it passes through a black piece, it turns 90 degrees. Additionally, blank grids can be left untouched or crossed either straight through or with a turn.

The game offers a challenging and engaging puzzle experience for players looking to test their logical thinking skills on the go.