What were the 5 most popular puzzles?
These turned out to be the most popular puzzles of the year last year with the most entries, we finished on a high with the most popular puzzle being the final one of the year. This was probably due to the incredibly tight race for top spots in the school leaderboard.

All Answers Puzzle Number Name Topics Puzzle URL Solution URL
1 596 42 The Slight Changes Puzzle Number Puzzle Solution
2 459 30 The Padlock Puzzle Logic Puzzle Solution
3 452 23 The Handshake Puzzle Number, Permutations Puzzle Solution
4 439 31 The Minimum Notes Puzzle Number, Logic Puzzle Solution
5 397 27 The Really Cool Hat Puzzle Number Puzzle Solution

What were the 5 most correctly answered puzzles?
Some of these puzzles were easy but others were just really impressively solved. The cipher puzzle is a bit of an outlier because unlike other puzzles you are unlikely to make a mistake in your calculations.

% Correct Puzzle Number Name Topics Puzzle URL Solution URL
1 96% 29 The Cipher Puzzle Puzzle Solution
2 91% 20 The Fruit Shop Puzzle Algebra Puzzle Solution
3 84% 14 The Jack & Maddie Puzzle Algebra Puzzle Solution
4 83% 21 The Odd Addition Puzzle Number Puzzle Solution
5 82% 33 The Sliced Cube Puzzle Geometry & Measure, Number Puzzle Solution

What were the 5 least correctly answered puzzles?
These were the toughest puzzles of the year, are you able to solve them?

% Correct Puzzle Number Name Topics Puzzle URL Solution URL
1 20% 34 The Seating Plan Puzzle Permutations Puzzle Solution
2 30% 35 The Straw Fist Puzzle Probability & Statistics, Permutations Puzzle Solution
3 33% 24 The Chess Piece Puzzle Permutations Puzzle Solution
4 33% 28 The Larger Latte Puzzle Geometry & Measure Puzzle Solution
5 37% 38 The Right Puzzle Geometry & Measure, Logic Puzzle Solution

How was the difficulty distributed throughout the year?
Both the amount of answers submitted and the amount of correct answers submitted seem to have no pattern. However, the % correct seems to oscillate up and down, perhaps this is to do with the fact that nobody wants two really difficult puzzles back to back and so that was deliberately avoided.

How accurate are the difficulty ratings?
All the puzzles receive a difficulty rating between 1 and 5 stars, 5 being the hardest. Below is an analysis of the % correct for each of the 42 puzzles. The box plots below show the distribution of the % correct for each puzzle. You can see that easier puzzles are generally more successfully answered but that there is overlap between the star ratings. You can also see that I have spent far too much time analysis how accurate the difficulty ratings are.



All Puzzle Data
Below is everything about how every puzzle in last year's competition was answered. However, they are all much better browsed through the puzzle library page.

Puzzle Number All Answers Correct Answers % Correct Name Topics Puzzle Hyperlink Solution Hyperlink
12 228 93 41% The ABCD Puzzle Number, Permutations Puzzle Solution
13 256 96 38% The Mouse & Cheese Puzzle Permutations Puzzle Solution
14 145 122 84% The Jack & Maddie Puzzle Algebra Puzzle Solution
15 277 176 64% Bob's Post Office Puzzle Ratio & Proportion, Geometry & Measure Puzzle Solution
16 276 123 45% The 110m Race Puzzle Ratio & Proportion, Geometry & Measure Puzzle Solution
17 325 200 62% The 6 Digits Puzzle Number, Logic Puzzle Solution
18 186 127 68% The Cube Displacement Puzzle Ratio & Proportion, Geometry & Measure Puzzle Solution
19 164 81 49% Selina's Tiles Puzzle Ratio & Proportion, Geometry & Measure Puzzle Solution
20 178 162 91% The Fruit Shop Puzzle Algebra Puzzle Solution
21 65 54 83% The Odd Addition Puzzle Number Puzzle Solution
22 245 136 56% The Two Teams Puzzle Permutations Puzzle Solution
23 452 245 54% The Handshake Puzzle Number, Permutations Puzzle Solution
24 279 91 33% The Chess Piece Puzzle Permutations Puzzle Solution
25 294 177 60% The Gummy Bears Puzzle Ratio & Proportion Puzzle Solution
26 187 111 59% The Symmetrical Go Puzzle Geometry & Measure Puzzle Solution
27 397 320 81% The Really Cool Hat Puzzle Number Puzzle Solution
28 336 111 33% The Larger Latte Puzzle Geometry & Measure Puzzle Solution
29 347 332 96% The Cipher Puzzle Puzzle Solution
30 459 313 68% The Padlock Puzzle Logic Puzzle Solution
31 439 279 64% The Minimum Notes Puzzle Number, Logic Puzzle Solution
32 228 118 52% The Light Bulb Puzzle Number Puzzle Solution
33 100 82 82% The Sliced Cube Puzzle Geometry & Measure, Number Puzzle Solution
34 104 21 20% The Seating Plan Puzzle Permutations Puzzle Solution
35 98 29 30% The Straw Fist Puzzle Probability & Statistics, Permutations Puzzle Solution
36 246 138 56% The Truncated Truncated Cube Puzzle Geometry & Measure Puzzle Solution
37 343 270 79% The Camel Racing Puzzle Logic Puzzle Solution
38 208 76 37% The Right Puzzle Geometry & Measure, Logic Puzzle Solution
39 329 247 75% The Octagon Puzzle Number Puzzle Solution
40 269 123 46% Selina's Tiling Job Puzzle Geometry & Measure Puzzle Solution
41 116 69 59% The Smallest Swap Puzzle Logic Puzzle Solution
42 596 412 69% The Slight Changes Puzzle Number Puzzle Solution