Kids' Puzzle Advent Calendar

One door a day, one quick brain puzzle behind it: number riddles, word builders and make-ten problems. Tap “Show answer” when you're ready.

24 puzzles with answersKindergarten to Grade 4Classroom-friendly projector view

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The reminder adds 24 all-day events (Dec 1–24) to Apple, Google or Outlook Calendar, each with a link back to that day's door.

All 24 days at a glance

Day 1 (Dec 1): Mystery number: I'm thinking of a number. If you add 3, you get 10. What's my number? Answer: 7
Day 2 (Dec 2): Word builder: Use all of these letters to spell a winter word: W, O, N, S Answer: SNOW
Day 3 (Dec 3): Stocking count: There are 4 stockings with 3 candies in each. How many candies in all? Answer: 12
Day 4 (Dec 4): Rhyme time: Which word rhymes with TREE: bee, cat or sock? Answer: bee
Day 5 (Dec 5): Double it: Add 8 + 2. Now double your answer. What do you get? Answer: 20
Day 6 (Dec 6): Unscramble: Unscramble these letters to make something that rings: L E B L Answer: BELL
Day 7 (Dec 7): What comes next?: 2, 4, 6, 8, ___ Answer: 10
Day 8 (Dec 8): Snowman math: Every snowman uses 3 snowballs. You build 5 snowmen. How many snowballs? Answer: 15
Day 9 (Dec 9): Hidden word: A small Christmas helper is hiding at the start of this word: ELFINALLY. Who is it? Answer: ELF
Day 10 (Dec 10): Half of it: What is half of 18? Answer: 9
Day 11 (Dec 11): Make ten: 6 + ___ = 10 Answer: 4
Day 12 (Dec 12): Which is longer?: Which is longer: one week or 10 days? Answer: 10 days (a week is 7 days)
Day 13 (Dec 13): Change one letter: Change one letter in COLD to make a shiny, precious metal. Answer: GOLD
Day 14 (Dec 14): Day detective: If today is Tuesday, what day will it be in 3 days? Answer: Friday
Day 15 (Dec 15): Vowel count: How many vowels are in REINDEER? Answer: 4 (E, I, E, E)
Day 16 (Dec 16): Cookie share: 12 cookies are shared equally by 3 friends. How many does each friend get? Answer: 4
Day 17 (Dec 17): ABC order: Put these in ABC order: sled, gift, bell Answer: bell, gift, sled
Day 18 (Dec 18): Clock puzzle: The clock says 3:00. What time will it be 45 minutes later? Answer: 3:45
Day 19 (Dec 19): Bigger number: Which is bigger: 47 or 74? Answer: 74
Day 20 (Dec 20): Compound word: SNOW + ___ = something you build in the yard Answer: SNOWMAN
Day 21 (Dec 21): Count by fives: 5 + 5 + 5 + 5 = ? Answer: 20
Day 22 (Dec 22): Opposites: What is the opposite of EARLY? Answer: LATE
Day 23 (Dec 23): Star sides: Bonus brain teaser: an outline of a 5-pointed star has how many straight sides? Answer: 10
Day 24 (Dec 24): Christmas Eve puzzle: 24 − 12 + 1 = ? Answer: 13

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Questions

What ages is this for?

Most puzzles suit kids around 5 to 10 years old (kindergarten to Grade 4). A few are marked as bonus brain teasers for older kids.

Can teachers use it in class?

Yes. Put the page on the classroom screen each morning and open the day's door together. The planner view shows all 24 puzzles and answers for preparing ahead.

When do the doors open?

Each door opens on its December date using your device's date, so kids can't peek ahead (but grown-ups can use the planner view).

Is it free?

Yes. No sign-up, no ads. It's made by the team behind Brainy Bucks: Math & Reading.