Hard fog
Hard is sixteen rooms under fog. Tap only walks revealed tiles. The walls are still a perfect maze — you just carry the map in memory.
The lamp sits on the gold marble. Tiles you already walked stay dim after the lamp moves on. Swipe or arrows help when a corridor ahead is still black.
Same walls, classic light
Open the same size in classic if you want to study the layout after a fog run. Seed chip shares either mode. Hint and Peek work; both leave Marks empty for that finish.
If you get stuck
Keep one hand on a wall — the right-hand rule still holds under fog. Bumps tell you where the doorways are. Hard is a preset; any size chip can run fog from the homepage.