Taiji

Taiji is an adventure puzzle-solving game set in a mysterious world full of puzzles. Unlike many adventure games, the puzzles in Taiji all use a consistent interface: a grid of tiles which can be toggled on or off.

Although this might seem simple, the consistency of the interface frees the player from guesswork or pixel hunting that happens in many adventure games. It is always clear what the player must interact with in order to solve the puzzle, but it is never entirely clear what they must do.