Walk with arrows or A/D. The URL is part of the game: change x= to pass a wall. Back rewinds history and leaves an echo at the remembered position. Keys can also be recovered from history. Edit the hash below or use your browser’s own address bar. Apply commits an edit; Rewind equals browser Back. Finish three rooms; R replays, Esc returns to the title. Each replay changes the rooms and increases difficulty. Reload starts fresh in the same room.

MIT source: michaelfrancoodev/four-oh-four · Edition notes · License. Desktop or landscape recommended. Touch controls appear after a touch.