Strategy Guide
Star Queen Battle is always solvable by pure logic. These techniques will take you from struggling on 5×5 boards to cracking 10×10 puzzles with confidence.
Fundamentals
Master these four habits and you will solve most puzzles cleanly.
Attack the most constrained region first
Find the colored region with the fewest cells and examine it first. A region with only two or three cells will have very few valid placements — or sometimes only one. Placing that queen early gives you free row and column eliminations across the rest of the board.
Mark rows and columns immediately
Every queen placement eliminates that entire row and column for all other queens. As soon as you place a queen, mark every other cell in its row and column with ✕. This visual feedback prevents you from accidentally considering invalid positions.
Mark diagonal neighbors immediately
After placing a queen, mark all four diagonal neighbors as eliminated. Queens cannot touch diagonally. On a dense board, diagonal exclusions often create forced placements in adjacent regions.
Look for forced placements
After eliminating cells from rows, columns, and diagonals, scan each region to see if only one cell remains. That is a forced placement — you know exactly where that queen must go. Forced placements cascade: each one eliminates more cells, revealing the next forced placement.
Advanced Techniques
For larger boards and harder configurations — when the fundamentals are not enough.
Cross-region elimination
If a row or column has all but one region's cells eliminated, that region's queen must be in that row or column — even if you have not placed it yet. You can use this knowledge to eliminate cells in that region that are not in the row or column. This "region lock" technique is powerful on larger boards.
Think in pairs
On hard boards, two regions sometimes compete for the same row or column. If placing region A's queen in row 3 forces region B into row 7, and placing region A in row 7 forces region B into row 3, both paths are viable until another constraint resolves them. Track which regions are linked and resolve other queens first.
Work the edges
Cells on the edge of the board have fewer diagonal and adjacency options. Corner cells in particular are highly constrained. If a region contains edge or corner cells, analyze those first — they are often part of the solution or force quick eliminations.
If stuck, find the smallest remaining region
When you run out of obvious deductions, return to the region with the fewest remaining valid cells. Pick the one with two or three options and test each. A single wrong choice usually creates an immediate contradiction (a region with no valid cells), which tells you exactly which option is correct.
The Golden Rule
Every Star Queen Battle puzzle has exactly one valid solution and can be reached entirely through logical deduction. If you find yourself guessing, step back — there is always a deduction you have not yet made. Look for the region with the fewest remaining valid cells, or check whether any row or column has been narrowed to a single region.
New to the game?
← Read the Beginner's Guide first