One calm number puzzle a day: hit the target
Five numbers, one target, plus and minus only. It's simple enough to do in your head on the bus and just tricky enough to feel good when it clicks.
Free · no account · updates itself · remove any time · download .ics
What shows up next
Numbers: 15, 10, 3, 4, 9 Target: 24
Numbers: 6, 11, 5, 16, 7 Target: 6
Numbers: 3, 18, 11, 17, 12 Target: 21
Numbers: 16, 15, 3, 17, 5 Target: 17
Numbers: 3, 2, 10, 15, 5 Target: 27
Numbers: 13, 12, 1, 15, 6 Target: 10
Numbers: 4, 16, 2, 7, 13 Target: 17
Each day of the month brings five numbers and a target between 5 and 30. Use four of them, each once, with plus and minus, to land exactly on it. There's often more than one way. The event shows one answer below a gap so you can check yours.
Every puzzle was generated and checked by a solver, so each one has at least one answer.
Number Puzzles: Sumbriska: A calm number puzzle where flipping bridges brings each island to its target sum.
Get it free on the App StoreHow to add it on iPhone
- Open this page in Safari on your iPhone.
- Tap Add to iPhone Calendar, then tap Subscribe.
- Tap Add. Events appear in the Calendar app within a minute.
On a Mac, the same button opens Calendar. In Google Calendar, use the Google button, or paste https://honestlittleapps.github.io/calendars/daily-number-puzzle-calendar/number-puzzle-daily.ics into Other calendars › From URL.
Questions
Is there always an answer?
Yes. Every puzzle was solved by computer before it went in the calendar.
Can kids play?
Confident 9–12 year-olds usually can. Younger kids can try using all five numbers with plus only.
What's Sumbriska?
A calm number puzzle game where you flip bridges until each island reaches its target sum.
Is this calendar free?
Yes. It costs nothing, needs no account and shows no ads. You can unsubscribe at any time.
How do I remove it from my iPhone?
Open the Calendar app, tap Calendars at the bottom, tap the ⓘ next to this calendar and choose Delete Calendar. Or go to Settings › Apps › Calendar › Calendar Accounts › Subscribed Calendars.
Other ways to get it
A daily page you can add to your Home Screen · an RSS feed · a free widget for your website · the press kit