12 Days of Christmas
26th
99 Bottles of Beer
19th
Arrows
13th
Billiards
5th
Card Number Validation
9th
Christmas Trees
14th
Collatz
29th
CSS Colors
9th
Day of Week
10th
Divisors
26th
Emojify
8th
Factorial Factorisation
9th
Fibonacci
97th
Fizz Buzz
57th
Foo Fizz Buzz Bar
17th
Forsyth–Edwards Notation
7th
Happy Numbers
36th
ISBN
9th
Leap Years
38th
ln 2
7th
Morse Decoder
7th
Morse Encoder
8th
Niven Numbers
38th
Ordinal Numbers
12th
Pangram Grep
16th
Pernicious Numbers
37th
Prime Numbers
38th
Prime Numbers (Long)
23rd
Repeating Decimals
2nd
Rock-paper-scissors-Spock-lizard
5th9th
ROT13
6th
Seven Segment
14th
Sudoku
4th
Tic-tac-toe
6th
Tongue-twisters
13th
Trinomial Triangle
8th
United States
11th
π
11th
τ
8th
√2
9th