Fill each row & column with 1–3. Cages must contain their listed numbers. Try it now — no signup needed.
A Noggin is a cage-style logic puzzle built around the idea that constraints — not guessing — should lead you to the answer. Every step can be proven. No trial and error needed.
Noggin puzzles are designed for curious minds of all ages: school children learning logical thinking, math teachers looking for classroom activities, puzzle fans who want something new, and anyone who enjoys a satisfying "aha!" moment.
Click a cell · type 1, 2, or 3 · Backspace to clear
Click a cell · type numbers · Backspace to clear
A Noggin puzzle in three steps.
Each row and column must contain every number from 1 up to the grid size — exactly once. Just like Sudoku rows and columns.
Dark outlines group cells into cages. If a cage lists numbers, those exact numbers must appear somewhere inside it.
The dots (•) give no number clue — they just stand for some unspecified number. In total, there are always exactly as many numbers plus dots as there are squares in the cage.
Easy Start here. Single logic steps.
Medium Two or three steps of reasoning.
Hard Requires careful bookkeeping.
Expert For experienced solvers only.
Three creatures live here. They are harmless.
Play in your browser, or download the PDF.