Haisu is a puzzle genre created by TheGreatEscaper.
- Draw a path from the starting cell to the goal cell. In puzz.link (and therefore most recent puzzle sources, including Covering Space Puzzles), the symbols used are “S” (for “Start”) and “G” (for “Goal”).
- The path passes through every cell on the grid.
- When a path passes through a cell marked with a number N, it must pass through that cell on the Nth time it has entered the region it is in.