A free postal logic puzzle: set the arrows once, then deliver the whole parcel queue. Blue arrows flip when a parcel passes through, so a route that works for the first delivery can fail for the next. Includes 12 puzzles, hints, undo and an optional step-by-step route view. Play in a desktop browser, in English or Russian. No download or player account needed.
Click an arrow to choose its starting exit, then press Check delivery. Parcels leave from left to right in queue order. Red arrows stay put; blue arrows change only when a parcel passes through them. Inspect a failed parcel with Step through, or change the arrows and try again. Mouse and keyboard controls; no timer. To leave feedback, use the comments on the itch.io page and tell us the puzzle number and what you expected to happen.
Route Fault was submitted to SlowDen by Kaninc. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-24. It runs in the browser with no download, no install and no sign-up.