Saturday, July 25, 2026
15×15 grid · 24–36 islands · ~30 min · 29 islands
Isolated stone:
follow the rule to its end —
no island stands alone.
Today's Medium 15×15 puzzle features 29 islands across a 15×15 grid. The extra space means more islands to track — work in sections.
Tips for Medium Hashi Puzzles
- Look for islands where the sum of their maximum possible bridges exactly equals their number — every connection must be used.
- If drawing a bridge would completely isolate a group of islands from the rest of the grid, that bridge is forbidden even if the counts allow it.
- Double bridges are powerful constraints. If an island needs 6 bridges and has only 3 neighbors, at least some must be doubles — work out which.
- When you get stuck, revisit islands you partially solved earlier. New bridges elsewhere may have eliminated options you didn't notice before.
Medium puzzles often have one or two pivotal islands that unlock the rest of the grid once solved. Find them first.
Full solving guide with advanced strategies →