Arithmagon
Each side of the shape shows the sum of the two corners it joins.
⏱10–20 min🧠Easy🔢Numbers & Patterns🖨Printer Optional
How to play
- Each box on a side equals the sum of the two circles it joins.
- Use the boxes to work out the missing circle values.
- Fill in every circle.
Tips for solving it
None of these give anything away — they are just how people who do these all the time get unstuck.
- Add all the side totals together: for a triangle that is twice the sum of the corners.
- From that total, subtract a side to get the opposite corner outright.
- Once one corner is known, every side touching it gives you another corner by subtraction.
- Check the last side you did not use - it should come out right for free.
An example puzzle
Have a go at this one first — it is smaller than the real thing. The answer key is hidden until you ask for it.
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Show the answer key
Answer Key
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What to expect on Patreon
It’s a puzzle party in here
Members get something new to solve three times a week — print it, play it, whenever you have the time.
- Monday Weekly puzzle Logic, number and word puzzles — a different kind each week.
- Wednesday Detective mystery A case to crack: suspects, clues, and one answer that fits.
- Friday Weekend Challenge A bigger one, built to last you all weekend long.
- Early access to elimination puzzles
- Early access to mystery party games
- Solve at your own pace — nothing expires
Think you can solve the puzzle?
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