Queen Placement Puzzle Rules: Rows, Columns, Colors, and Diagonals

Sudoku Puzzle: ColorQueens is a queen-placement puzzle with a colorful twist. The rules are short, but the interactions between them create satisfying logic.

The Core Goal

Place queens on the board so every required area is satisfied and no queen conflicts with another queen.

In ColorQueens, that means:

Rule 1: One Queen Per Color

Color regions are the heart of ColorQueens. Each colored area needs exactly one queen.

If a region has only a few squares, it is often the best place to start. Small regions create strong constraints.

Rule 2: One Queen Per Row

Once a queen is placed in a row, no other queen can go in that row. This rule makes each placement affect the entire board.

Rows are useful for quickly eliminating squares in multiple color regions at the same time.

Rule 3: One Queen Per Column

Columns work the same way as rows. A confirmed queen blocks every other square in its column.

When a row and column cross inside a small color region, you may find a forced move.

Rule 4: Avoid Diagonal Conflicts

Queens cannot attack diagonally. This rule adds the most tactical pressure because diagonal conflicts can block distant squares.

Before placing a queen, check nearby diagonals and ask whether the move leaves each remaining color region with at least one legal square.

The Best Rule of Thumb

Do not ask, "Where could a queen go?"

Ask, "Where can a queen no longer go?"

ColorQueens becomes easier when you treat every rule as a filter. Remove illegal squares, find forced moves, and let the board solve itself one queen at a time.

For a beginner walkthrough, read How to Play ColorQueens.