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Star Battle

Expert (10×10, 2★)

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Play Expert Star Battle — ThePuzzleLabs

Try this Expert Star Battle puzzle on ThePuzzleLabs.

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How to Play Star Battle

Rules

  • Place exactly 2 stars 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 expert Star Battle (10×10, 2★)

Expert Star Battle uses a 10×10 grid with 2 stars per row, column, and region. That doubles the stars from the hard level: 20 stars instead of 10. The adjacency constraint now interacts with itself: your first star in a region blocks cells that might be needed for the second. The reasoning chains become significantly longer.

Within each region, enumerate the valid pairs of cells that can hold two non-adjacent stars. Some regions have only 2 or 3 valid configurations. Cross-reference those configurations with row and column constraints to eliminate impossible placements. When a region has been narrowed to one configuration, place both stars and propagate.

Expert puzzles require patience and systematic tracking. Mark eliminated cells diligently. Use the star count indicators to spot rows or columns approaching their quota. If you find yourself stuck, look for confinement patterns: regions whose stars must be in specific rows or columns. For the ultimate challenge, try einstein.