ThePuzzleLabs

Star Battle

Hard (10×10, 1★)

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Play Hard Star Battle — ThePuzzleLabs

Try this Hard Star Battle puzzle on ThePuzzleLabs.

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How to Play Star Battle

Rules

  • Place exactly 1 star in each row, column, and region.
  • Stars cannot touch each other — not even diagonally.
  • The thick borders show the region boundaries.
  • Each region is tinted with a subtle color for visibility.

Strategies

  • Look for small regions — fewer cells means fewer possible star placements.
  • Mark cells with × where stars definitely cannot go.
  • Use the adjacency rule to eliminate cells around placed stars.
  • Count remaining candidates per row, column, or region.

Controls

  • Click a cell to place/remove a star (or mark in mark mode).
  • Right-click to quickly toggle a mark.
  • Use arrow keys to navigate.
  • Press S for star, X for mark, M to toggle mark mode.
  • Press H for a hint.

Solve This Puzzle?

This will fill in the complete solution. The puzzle will be marked as “solved with reveal” rather than self-solved.

About hard Star Battle (10×10, 1★)

Hard Star Battle uses a 10×10 grid with 10 irregular regions and 1 star per row, column, and region. A hundred cells with only 10 stars makes the grid feel sparse, and region shapes get more complex. Some regions snake across the grid, giving many possible star positions that must be narrowed through multiple constraint layers.

Multi-region elimination chains become necessary at this level. Region confinement and reverse confinement work together: if region A can only place its star in row 3, and row 3's only valid cells outside region A belong to region B, then region B's star is forced into row 3 as well. Following these chains across the grid is what distinguishes hard from medium.

Take your time with the initial scan. Identify the most constrained regions and rows first, resolve what you can, and let the cascading eliminations do the work. These puzzles are still 1-star, so the jump to expert (2★) will feel like a different puzzle entirely.