形独 app for iPhone and iPad

The “orthogopuzzle” (Xingdu in Chinese) was inspired by Sudoku. It is a mathematic game which requires players to draw in the grid a single polyline whose starting and ending points should overlap with the given polyline and be orthogonal to the corresponding line. Every puzzle in the game has one and only one answer. We designed 4 parts, and each part includes 6 games with increasing difficulty.

The APP will record minimum steps you used for each game. During the game, you can freely switch the starting point of your polyline.

The background picture of the game is starry sky, means exploring the interesting mathematic world. Hope you enjoy it : )