THE DETECTIVE’S DESK
Try 15 puzzles at your desk or on your phone. No account needed. Open a hint if you get stuck.
PUZZLE 1
Triangle + triangle = 6. Triangle + square = 7. Square + circle = 11. Enter triangle, square, circle as a three-digit code.
Ready when you are.
Find triangle first, then substitute it into the next line.
Triangle is 3, square is 4 and circle is 7.
PUZZLE 2
Move every letter back one place in the alphabet: MJCSBSZ. Which room does it spell?
Ready when you are.
M becomes L and J becomes I.
Moving each letter back gives LIBRARY.
PUZZLE 3
A key is in one box. Exactly one label is true. Gold: “The key is in silver.” Silver: “The key is not in silver.” Bronze: “The key is not in gold.” Which box holds it?
Ready when you are.
Try each possible box and count the true statements.
Only a key in gold makes exactly one label true: the silver label.
PUZZLE 4
A=1, B=2, C=3, and so on. Decode 19–1–6–5.
Ready when you are.
19 is S.
19=S, 1=A, 6=F, 5=E.
PUZZLE 5
Each number doubles, then adds 1. Complete the sequence: 2, 5, 11, 23, ?
Ready when you are.
Apply the rule to 23.
23 × 2 + 1 = 47.
PUZZLE 6
Start at the fountain. Walk 3 squares north, 2 east, 1 south and 2 west. How many squares directly north of the fountain are you now?
Ready when you are.
East and west cancel.
3 north minus 1 south leaves 2 north.
PUZZLE 7
A word is written backwards: REWARD. Read it from right to left to discover where to search.
Ready when you are.
Start with the final R.
REWARD read backwards is DRAWER.
PUZZLE 8
Red, blue and green keys lie in a row. Green is immediately right of blue. Red is not in the middle. Blue is not at the left end. Which colour is in the middle?
Ready when you are.
Find the only possible place for the blue-green pair.
The order is red, blue, green.
PUZZLE 9
Your briefing starts at 14:35 and lasts 20 minutes. The game starts immediately and lasts 60 minutes. What time does the game end? Use HH:MM.
Ready when you are.
First add the briefing, then the game.
14:35 + 20 minutes = 14:55; another hour gives 15:55.
PUZZLE 10
Two identical keys and one coin weigh 17 grams. One key and one coin weigh 11 grams. How many grams does one key weigh?
Ready when you are.
Subtract the second weighing from the first.
17 − 11 = 6 grams.
PUZZLE 11
Read the first letter of each word: Gather All Tools Early. What word appears?
Ready when you are.
Gather starts with G.
The first letters are G, A, T, E.
PUZZLE 12
Four switches are worth 8, 4, 2 and 1 from left to right. ON adds its value; OFF adds zero. ON, OFF, ON, ON gives what total?
Ready when you are.
Add only the values of the three ON switches.
8 + 2 + 1 = 11.
PUZZLE 13
Shelf labels advance by 3 alphabet positions each time: B, E, H, K, ?. Give the next letter.
Ready when you are.
Count three letters after K.
L, M, N: the next label is N.
PUZZLE 14
Exactly one of Ada, Ben and Cora took a ticket. A camera proves Ada did not take it. Exactly one statement is true. Ada: “Ben took it.” Ben: “Cora took it.” Cora: “Ben is lying.” Who took it?
Ready when you are.
Ben and Cora make opposite claims, so one of those is already true.
Ben and Cora make opposite claims, so Ada must be false: Ben did not take it. The camera excludes Ada, leaving Cora.
PUZZLE 15
A three-digit code has no zeroes. The first digit is twice the last. The middle digit is one more than the last. The three digits add up to 13. What is the code?
Ready when you are.
If the last digit is x, the sum is 2x + (x+1) + x.
4x + 1 = 13, so x=3. The code is 643.
Practice puzzles only: no prizes, rankings or booking rewards.
THE CLASSIC RIVER-CROSSING CHALLENGE
Get yourself, a fox, a chicken and a sack of grain from Start Island to Finish Island. Your boat carries you and just one passenger or item. You can also cross alone.
You keep everyone safe while you are on their island. Leave them unsupervised and the fox eats the chicken, or the chicken eats the food. Can you solve it in seven crossings?
Ready to set sail. You and everyone else are on Start Island.
0 crossings
Tap a button to cross immediately. Unavailable passengers are on the other island. Every journey, including returning alone, counts as a crossing.
Start by taking the chicken. You may need to bring a passenger back rather than always moving everyone forward.
The fox and food can safely wait together.
Just for fun. This game has its own crossing counter and does not affect mini-puzzle progress, rewards or venue leaderboards. Refreshing starts a new game.
VENUE OWNERS
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