Lantern Causeway

Carry lantern oil between three beacons. Reuse two bridges, collect a bomb and reopen the causeway. Each new beacon refills your light. Walk mode moves one orthogonal tile and spends one oil. Build mode places a two-cell bridge adjacent to you; permanent land may overlap. Reclaim mode recovers a bridge within Manhattan distance two, unless you stand on it. Build, reclaim, bomb and lighting do not spend oil. First beacon grants a bomb; use beside the rock. Light each beacon explicitly. Undo restores every resource and crossing.