Daily
Missing Number
Every shape follows the same hidden rule: the corners make the number in the middle. Work out the rule and fill in the question mark.
How to play
- The first two shapes show the rule at work. The third is missing its middle number.
- Rules use the corner numbers with +, − and ×. Where each number sits matters.
- Stuck? Hint gives you a nudge. After two wrong tries you can reveal the answer.
- Daily is one shared puzzle a day at medium difficulty — share your result and keep your streak going.
- Or practise as much as you like: Easy sticks to + and −, Medium brings in ×, Hard uses corners twice and brackets.
- You'll see every rule of a difficulty once before any comes back. Each difficulty keeps its own progress in this browser.