What makes this different from regular N-Queens?

In addition to the standard N-Queens rules (one per row and column, no diagonal adjacency), Crown Quest adds colored regions — each region must also contain exactly one queen, adding another layer of constraint.

How does the hint system work?

The hint system runs a backtracking solver on the current board state and suggests the next correct queen placement. It reveals one valid position at a time.

Why are some of my queens highlighted in red?

Red highlighting indicates a conflict — two queens sharing a row, column, region, or diagonal adjacency. Remove one of the conflicting queens to resolve it.

Can I change the grid size?

Yes. The grid size is tied to difficulty: Easy is 6x6 with 6 regions, Medium is 8x8 with 8 regions, and Hard is 10x10 with 10 regions.

Crown Quest

Pick up where you left off

Continue your progress, start fresh or challenge yourself.

No saved game

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Start a fresh game

Jump right into a new game session.

All progress is saved automatically

You can continue anytime from this device.

How to Play Crown Quest

Objective

Place exactly one queen in each row, each column, and each colored region of the grid. No two queens may touch — not even diagonally.

Controls

Tap or click a cell to place a queen. Tap again to remove it. The grid is divided into colored regions, each requiring exactly one queen.

Step by Step

1Study the colored regions on the grid. Each region needs exactly one queen.
2Place a queen in a cell. The game highlights conflicts if the placement violates any rule.
3Ensure no two queens share the same row, column, or touch diagonally.
4Use the undo button to take back placements, or request a hint if stuck.
5Continue until every row, column, and region contains exactly one queen with no adjacency conflicts.

Winning

The puzzle is solved when every row, column, and colored region contains exactly one queen, and no two queens are adjacent in any direction (including diagonals).

Crown Quest Rules

Place exactly one queen in each row.
Place exactly one queen in each column.
Place exactly one queen in each colored region.
No two queens may be adjacent horizontally, vertically, or diagonally.
Every puzzle has a unique valid solution.

Tips & Strategies

1.Start with the smallest regions — a region with fewer cells has fewer possible queen placements, making it the easiest to solve first.

2.Mark cells that cannot contain a queen. When you place a queen, mentally (or physically) eliminate all cells in its row, column, and diagonal neighbors.

3.Look for rows, columns, or regions that have only one remaining valid cell after eliminations — these are forced placements.

4.On larger grids, work systematically from one corner. Solving part of the grid constrains the remaining placements significantly.

5.If you are stuck, try placing a queen in an uncertain spot and see if it leads to a contradiction. If it does, the other option must be correct.

About Crown Quest

Crown Quest is a constraint-based logic puzzle inspired by the N-Queens problem and Star Battle puzzles. It challenges you to place queens on a grid divided into colored regions while respecting row, column, region, and adjacency rules. Three difficulty levels are available: Easy (6x6 grid), Medium (8x8), and Hard (10x10). The game includes undo, a hint system that uses a backtracking solver to suggest the next placement, error highlighting to identify conflicts immediately, and a timer to track your solve time.

Frequently Asked Questions

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