Hashi

About hard hashi

Larger grids (up to 15×15) with 18 to 30 islands. The forced-bridge pass solves less of the puzzle upfront, and you need to combine elimination with connectivity reasoning. If removing a candidate bridge would isolate an island cluster, that bridge is required.

Hard hashi rewards patience. Work outward from the forced bridges, tighten the constraints with elimination, and use connectivity as the tiebreaker. If you think you need to guess, you've missed a deduction.