Room for Murder Daily › Blog › 12 Christmas Brain Teasers for Adults (with Answers)
12 Christmas Brain Teasers for Adults (with Answers)
Twelve Christmas brain teasers for adults — quick holiday riddles, Secret Santa and reindeer logic puzzles, and three devious whodunits about unplugged lights and missing cookies. Answers under each one and a free printable PDF.
- Twelve original Christmas brain teasers for adults: five quick ones, four logic puzzles and three hard whodunits.
- Answers are hidden under each teaser; the set prints as a free PDF with an answer key.
- Every logic teaser was checked by computer: exactly one answer each.
- For a bigger holiday puzzle, print the free Christmas pack: six snowed-in floor-plan murder mysteries.
Somewhere between the last present and the first board game there's always a quiet hour. These twelve Christmas brain teasers for adults fill it: five quick riddles to read aloud, four logic puzzles for two heads together, and three whodunits worthy of a fireside.
All twelve are original, the logic ones were checked by computer (each has exactly one answer), and every answer is folded away until you tap Show the answer. Printing for the family? Here's the whole set:
Download the free printable PDFAll 12 puzzles on US Letter, with the answer key at the back
Quick Christmas teasers (1–5)
Read aloud, no pencil needed. Good for mixed ages and for the car journey to Grandma's.
1. The Twelve DaysEasy
In the old carol, on the first day of Christmas you get one gift. On the second day you get two turtle doves and another partridge; on the third, three French hens plus everything from day two again; and so on. Counting every gift from all twelve days, how many presents is that?
Show the answer
364 — one for every day of the year but one. Day n brings 1 + 2 + … + n gifts, so the twelve days add up to 1 + 3 + 6 + 10 + 15 + 21 + 28 + 36 + 45 + 55 + 66 + 78 = 364.
2. One Bulb OutEasy
A string of 64 Christmas lights has one dud bulb, and the whole string stays dark until you find it. Your tester can check any stretch of the string and tell you whether the dud is somewhere in it. What’s the smallest number of tests that is guaranteed to find the bad bulb?
Show the answer
Six. Test half the string each time and keep the half with the dud: 64 → 32 → 16 → 8 → 4 → 2 → 1.
3. The Toppled SnowmanEasy
On Christmas morning the snowman in the front garden lay in pieces. It had been −8 °C all night and was still −8 °C at breakfast. “It must have melted in the night and toppled over,” said nephew Pete. Who knocked the snowman down?
Show the answer
Pete. Snow doesn’t melt at −8 °C — and the only person explaining it away is the one who did it.
4. The Advent DoorEasy
Ella opens one advent calendar door every morning, starting on 1 December. This year, 1 December falls on a Tuesday. On which day of the week does she open door 24?
Show the answer
Thursday. Door 24 comes 23 days after door 1: three whole weeks and two days, so two days after Tuesday.
5. Ribbon Round the BoxEasy
A present is a box 30 cm long, 20 cm wide and 10 cm tall. The ribbon goes once round the box lengthwise and once round it widthwise — over the top and under the bottom both times — and 30 cm more makes the bow. How much ribbon do you need?
Show the answer
170 cm. Lengthwise: 2 × (30 + 10) = 80 cm. Widthwise: 2 × (20 + 10) = 60 cm. Plus 30 cm for the bow.
Christmas logic puzzles (6–9)
Pair up: one reads the clues, the other keeps track on the back of an envelope (there are always envelopes at Christmas).
6. The Gingerbread ThiefMedium
Four gingerbread men vanished from the cooling rack. One of four cousins took them; the thief lies and the other three tell the truth.
- Holly: “It wasn’t Ivy.”
- Ivy: “Jasper took them.”
- Jasper: “Ivy is lying.”
- Kris: “Holly is telling the truth.”
Who took the gingerbread?
Show the answer
Jasper. If Holly were the thief, her lie would make Ivy guilty too. If Kris were the thief, his lie would make Holly a liar as well. If Ivy were the thief, honest Holly would be wrong about her. That leaves Jasper: he lies about Ivy, Ivy rightly names him, and Holly and Kris are honest.
7. Secret SantaMedium
Ann, Bo, Cass, Dee and Eli drew names for the office Secret Santa. Each buys exactly one present for someone else, and the presents go round in one big loop.
- Ann buys for Cass.
- Dee buys for Bo.
- Eli doesn’t buy for Ann.
- Cass doesn’t buy for Dee.
Who buys Eli’s present?
Show the answer
Cass. Cass can’t buy for herself, for Dee (clue 4), for Bo (Dee does) or for Ann (Ann buys for Cass, and that would close a loop of two). So Cass buys for Eli. The whole loop: Ann → Cass → Eli → Dee → Bo → Ann.
8. The Reindeer Line-upMedium
Six reindeer pull the sleigh in three pairs — front, middle and back — each pair with a left and a right place.
- Dasher and Dancer pull side by side.
- Comet pulls front right.
- Vixen pulls on the left, somewhere in front of Cupid.
- Prancer isn’t in the middle pair.
- Dasher pulls on the right.
Who pulls front left?
Show the answer
Vixen. Dasher and Dancer share a pair, and it isn’t the front one (Comet is there). If they were at the back, Prancer would have to be front left, leaving the middle pair to Vixen and Cupid side by side — but Vixen must be in front of Cupid. So Dasher and Dancer are the middle pair and Prancer is at the back. Vixen is on the left and ahead of Cupid, so she pulls front left.
9. Gift TagsMedium
Four children each get one big present: a sled, a telescope, a puppet or a train set.
- Mia’s present isn’t the sled or the train set.
- Nate didn’t get the telescope or the train set.
- Olive didn’t get the telescope or the puppet.
- Pip’s present needs snow.
Who gets the puppet?
Show the answer
Nate. Pip’s present needs snow, so Pip gets the sled. Olive can’t have the telescope or the puppet, so she gets the train set. That leaves the telescope and the puppet for Mia and Nate, and Nate didn’t get the telescope.
Room for Murder Daily
A new floor-plan murder mystery every morning: place the suspects, find who was alone with the victim. No sign-up, works on phones.
Play today's caseHard Christmas whodunits (10–12)
Three classics of logic puzzling in festive dress: only one statement is true, truth-tellers and liars, and a timeline to untangle. Assume, follow the consequences, and throw out any story that breaks a rule.
10. Who Unplugged the Lights?Hard
Someone unplugged the Christmas lights in the middle of the carols. Only one of these three statements is true.
- Noel: “I didn’t do it.”
- Opal: “Noel didn’t do it.”
- Piers: “Noel did it.”
Who unplugged the lights?
Show the answer
Noel. Noel’s and Opal’s statements say the same thing, so they’re either both true or both false. Two true statements would be one too many, so both are false — Noel did it — and Piers’s is the one true statement.
11. Elves and ImpsHard
In the toy workshop every helper is either an elf, who always tells the truth, or an imp, who always lies. Whoever broke the train set is an imp.
- Bramble: “Clove didn’t break it.”
- Clove: “Fennel is an imp.”
- Fennel: “Bramble broke it.”
Who broke the train set?
Show the answer
Fennel. If Fennel were an elf, Bramble would be the culprit — an imp, whose lie would make Clove the culprit too. So Fennel is an imp. Then Clove’s statement is true, so Clove is an elf, and elves don’t break train sets. Fennel lies, so Bramble didn’t break it either. The culprit is Fennel.
12. Who Ate Santa's Cookies?Hard
On Christmas Eve the family went to bed one at a time, at 10:00, 10:30, 11:00, 11:30 and midnight. At a quarter to twelve the plate of cookies for Santa was still full — so the cookie thief was the last one up.
- Gran went to bed before Leo.
- Dad went to bed an hour after Mum.
- Ruby went to bed half an hour after Leo.
Who ate Santa’s cookies?
Show the answer
Ruby. Mum and Dad went to bed an hour apart: 10:00 and 11:00, 10:30 and 11:30, or 11:00 and midnight. Leo and Ruby need two times half an hour apart. With Mum at 10:30 and Dad at 11:30, the times left (10:00, 11:00, midnight) are never half an hour apart. With Mum at 11:00 and Dad at midnight, Leo and Ruby would need 10:00 and 10:30 — but Gran went to bed before Leo. So Mum 10:00, Gran 10:30, Dad 11:00, Leo 11:30 and Ruby at midnight.
A bigger puzzle for the holidays: the free Christmas pack
Our free Christmas logic puzzles pack has six snowed-in murder mysteries from Juniper Falls — a gingerbread bakery, the Christmas market, a frozen lake — each one a floor plan with a handful of suspects and one statement each. Place everyone, one person per row and column, and the killer is whoever was alone with the victim. Answers and step-by-step solutions are at the back.
From 30 November to 3 January, the free daily case on Room for Murder moves to the same snowy town — so you can open one every morning, like an advent calendar.
Christmas puzzles to give (or keep)
Room for Murder: Winter
90 cosy Christmas floor-plan mysteries in snowed-in Juniper Falls — a ski lodge, the Christmas market, a frozen lake and a snowbound train. A lovely stocking stuffer.
Solo or together · paperback or printable PDF
Paperback on Amazon PDF on Etsy
The Parcel Post Poisoner
Christmas 1952 at a Vermont post office: open one door a day — a new clue every morning — and unmask the poisoner on Christmas Eve.
1–4 solvers, 1–24 December
See it on EtsyTips for a Christmas puzzle hour
- Make it a team sport. Kids read the clues aloud; grown-ups keep the notes.
- Prizes from the stocking. The first correct answer picks the next chocolate from the tin.
- One a day in December. Twelve teasers fit neatly into the first twelve days of advent — answers on the 13th.
- Save the hardest for last. Teaser 12 works best after dinner, when everyone claims they were in bed by eleven.
Questions people ask
What are good Christmas brain teasers for adults?
A mix: a couple of quick riddles to read aloud (how many gifts in the twelve days of Christmas?), some logic puzzles for pairs (a Secret Santa loop, a reindeer line-up) and one or two proper whodunits for the puzzle lovers. All twelve on this page are original and come with answers.
Are these Christmas brain teasers suitable for kids?
Teasers 1–5 suit most kids from about nine, 6–9 confident readers from about eleven, and the last three are for teens and adults — or a mixed team. Nothing is scary: the worst crime here is eating Santa's cookies.
How can I use them at a Christmas party?
Print the free PDF and hand a page to each table or team, or read one aloud between games. They also make a good advent activity: one teaser a day from 1 December, with the answers on the 13th.
Where can I find more Christmas logic puzzles?
On our Christmas logic puzzles page: a free printable pack of six snowed-in murder mysteries, and from 30 November to 3 January a new free Juniper Falls case every day. The Room for Murder: Winter book has 90 more.
Keep reading
- 12 Thanksgiving Brain Teasers for Adults (with Answers)
- 25 Murder Mystery Riddles with Answers (Short Whodunits for Adults)
- Murder Mystery Advent Calendars 2026: The Best Ones + a Free Printable
We make the games mentioned in this guide — that's why we know them well. Links to Etsy go to our own shop, Midnight Motive.