One of each

Every board is a grid of coloured regions. Place one specimen in every row, every column and every region, and never let two specimens touch, not even diagonally. Each puzzle has exactly one answer, and you can always reason your way to it. No guessing.

What's inside

• Hundreds of levels, from gentle 4×4 boards to devious 9×9 cabinets
• A new Daily Puzzle every day, the same for everyone
• Rankings of real players only, no bots
• The Specimen Journal, with rare finds for keeping your streak
• Play as a guest, or sign in with Google to keep your progress on any phone

Ads are rare and never interrupt a puzzle. Watching one is always your choice.