Protect the unattended bank
The guide keeps the ferry bank calm. Only the bank being left behind must contain no listed unsafe pair.
AYE.GG / RIVER-CROSSING LOGIC
Canopy Ferry
Move every passenger east without leaving an unsafe pair alone on the unattended bank.
River crossing
Crossing1 / 50
Moves0
Shortest route7
Capacity1
West bank
EAST →Guide only
East bank
Unsafe when left alone
The guide is always aboard. The ferry may cross empty or carry up to the listed passenger capacity.
Tap passengers to board or unload · Space/Enter sails · U undoes · H gives a shortest-route hint · R resets.
How to solve river-crossing puzzles
Plan the return
Moving everyone east requires return trips. Sometimes the guide should sail back alone; sometimes one passenger must return to keep the opposite bank safe.
Use the shortest-route clue
Every one of the 50 crossings is checked by a complete state-space solver. Route hint selects the next passenger group from a shortest valid route.