Friday, July 10, 2026
15×15 grid · 24–36 islands · ~30 min · 28 islands
Count the bridges twice,
each number holds its promise —
the grid breathes and clears.
Today's Hard 15×15 puzzle features 28 islands across a 15×15 grid. A challenging solve that rewards systematic elimination and careful connectivity checks.
Tips for Hard Hashi Puzzles
- Connectivity is your most powerful constraint. At every step ask: if I draw this bridge, could it strand a group of islands? If yes, it's forbidden.
- High-value islands (6, 7, 8) in dense areas leave very little freedom — enumerate their possible bridge combinations and eliminate any that break connectivity.
- Look for near-complete subgraphs: clusters of islands that can only connect to the rest of the grid through a single bridge. That bridge is forced.
- When direct deduction stalls, try assuming a bridge and following the chain of consequences. A contradiction anywhere means the assumption was wrong.
Hard puzzles are solved in layers. Each deduction round reveals new constraints — patience and systematic elimination always find the path.
Full solving guide with advanced strategies →