The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Factorial Factorisation in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Multitap Input Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 881st KatieLG 🇬🇧 136 871 3ms 13 Apr 2024 881st KatieLG-Transpiler 🇬🇧 136 871 3ms 16 Aug 2024 881st Mabeloid 🇳🇴 136 871 3ms 17 Sep 2024 884th dokutan 135 816 7ms 10 Sep 2025 885th HumanoidCPU 134 867 124ms 13 Apr 2024 885th Yewzir 🇧🇪 134 867 122ms 13 Apr 2024 885th bac0id 134 867 121ms 26 Jun 2024 885th Mabeloid 🇳🇴 134 867 123ms 17 Sep 2024 885th CaedenHarper 🇨🇦 134 867 124ms 22 Jan 2025 890th dokutan 132 757 2ms 2 Aug 2024 891st dokutan 132 821 42ms 9 Oct 2024 892nd KatieLG 🇬🇧 131 870 7ms 20 Apr 2025 892nd HumanoidCPU 131 870 6ms 26 May 2025 892nd CaedenHarper 🇨🇦 131 870 6ms 22 Feb 2026 895th Shanethegamer 🇺🇸 131 873 5ms 20 Apr 2025 896th dokutan 130 800 129ms 3 Feb 2025 897th KatieLG 🇬🇧 130 835 465ms 30 Nov 2025 898th CaedenHarper 🇨🇦 130 869 4ms 22 Jan 2025 899th MeWhenI 🇻🇦 130 870 69ms 13 Apr 2024 899th MeWhenI 🇻🇦 130 870 4ms 13 Apr 2024 899th HumanoidCPU 130 870 65ms 13 Apr 2024 899th HumanoidCPU 130 870 4ms 13 Apr 2024 899th Yewzir 🇧🇪 130 870 71ms 13 Apr 2024 899th KatieLG 🇬🇧 130 870 4ms 13 Apr 2024 899th Yewzir 🇧🇪 130 870 4ms 13 Apr 2024 899th bac0id 130 870 67ms 25 Jun 2024 899th bac0id 130 870 3ms 25 Jun 2024 899th KatieLG-Transpiler 🇬🇧 130 870 66ms 16 Aug 2024 899th KatieLG-Transpiler 🇬🇧 130 870 4ms 16 Aug 2024 899th Mabeloid 🇳🇴 130 870 4ms 17 Sep 2024 899th Mabeloid 🇳🇴 130 870 86ms 17 Sep 2024 899th xyangst 130 870 74ms 3 Oct 2024 899th CaedenHarper 🇨🇦 130 870 71ms 20 Jan 2025 899th gigaprofisi 🇺🇸 130 870 3ms 6 Nov 2025 915th dokutan 129 782 1ms 6 Oct 2024 916th KatieLG 🇬🇧 129 852 10ms 30 Nov 2025 917th HumanoidCPU 129 882 114ms 13 Apr 2024 917th Yewzir 🇧🇪 129 882 109ms 13 Apr 2024 917th dokutan 129 882 105ms 14 Apr 2024 917th RealAMC 🇳🇿 129 882 107ms 24 Apr 2024 917th bac0id 129 882 111ms 26 Jun 2024 917th JGDoerrer 129 882 103ms 17 Jul 2024 917th Mabeloid 🇳🇴 129 882 114ms 17 Sep 2024 917th CaedenHarper 🇨🇦 129 882 115ms 22 Jan 2025 925th MarkShcerbakov 128 780 425ms 14 Aug 2024 926th KatieLG 🇬🇧 128 826 107ms 30 Nov 2025 927th KatieLG-Transpiler 🇬🇧 128 886 107ms 16 Aug 2024 928th HumanoidCPU 127 870 65ms 13 Apr 2024 928th Yewzir 🇧🇪 127 870 65ms 13 Apr 2024 928th bac0id 127 870 63ms 26 Jun 2024 928th Mabeloid 🇳🇴 127 870 68ms 17 Sep 2024 928th The-Wolfson 127 870 70ms 18 Dec 2024 928th CaedenHarper 🇨🇦 127 870 62ms 22 Jan 2025 928th dokutan 127 870 64ms 3 Feb 2025 935th KatieLG 🇬🇧 127 871 68ms 13 Apr 2024 936th madeforlosers 127 3,559 2ms 8 Nov 2024 937th dokutan 126 695 1ms 21 Jun 2025 938th mrmena 🇦🇺 126 821 39ms 16 Apr 2024 939th dokutan 126 842 20ms 20 Jul 2025 940th HumanoidCPU 126 870 5ms 4 May 2024 940th bac0id 126 870 5ms 26 Jun 2024 940th KatieLG-Transpiler 🇬🇧 126 870 5ms 16 Aug 2024 940th Mabeloid 🇳🇴 126 870 5ms 17 Sep 2024 940th CaedenHarper 🇨🇦 126 870 5ms 20 Jan 2025 945th MeWhenI 🇻🇦 126 873 5ms 13 Apr 2024 946th dokutan 125 848 6ms 12 Dec 2024 947th OfficialCB 125 875 5ms 23 Apr 2024 948th KatieLG-Transpiler 🇬🇧 125 888 640ms 16 Aug 2024 949th mrmena 🇦🇺 124 805 3ms 15 Apr 2024 950th KatieLG 🇬🇧 124 807 1,216ms 30 Nov 2025 951st Shanethegamer 🇺🇸 124 871 40ms 22 Aug 2024 951st KatieLG 🇬🇧 124 871 41ms 22 Aug 2024 951st HumanoidCPU 124 871 38ms 25 Aug 2024 951st Mabeloid 🇳🇴 124 871 40ms 17 Sep 2024 951st CaedenHarper 🇨🇦 124 871 41ms 22 Jan 2025 951st gigaprofisi 🇺🇸 124 871 41ms 5 Nov 2025 957th KatieLG 🇬🇧 124 893 446ms 13 Apr 2024 957th HumanoidCPU 124 893 462ms 27 Jun 2024 959th Yewzir 🇧🇪 124 894 449ms 13 Apr 2024 959th bac0id 124 894 472ms 25 Jun 2024 First Prev 881–960 of 1,484 Next Last