Play the eight queens puzzle online

Give eight queens room to coexist. Tap a square to place or remove a queen. Place eight queens so none attacks another.

How to play

1. Tap a square to place a queen, or tap your queen again to remove it; given queens are fixed.
2. No two queens may share a row, column, or diagonal, and blocked squares cannot hold a queen.
3. Place eight nonattacking queens to pass; the Threats button helps show conflicting squares.

Logic

• Binary Balance — Find the balance hidden between zero and one.
• Skyscraper View — Use clues around the edge to deduce tower heights.
• Arithmetic Cages — Solve arithmetic and grid logic together.