The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Forsyth–Edwards Notation 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 80th sean-niemann 🇺🇸 913 117 161ms 19 May 2025 80th Steffan153 🇫🇮 913 117 182ms 27 days ago 83rd Natanaelel 🇸🇪 912 75 34ms 24 Jun 2023 84th scpchicken 🇵🇼 911 68 3ms 1 May 2023 84th Steffan153 🇫🇮 911 68 4ms 2 May 2023 84th GrayJoKing 🇦🇺 911 68 4ms 2 May 2023 87th edsrzf 🇳🇿 911 93 1,524ms 30 Jan 2026 87th JayXon 🇺🇸 911 93 1,315ms 30 Jan 2026 89th AdrienHache 🇫🇷 910 73 47ms 26 Nov 2024 90th btnlq 907 126 9ms 6 May 2023 90th m-tkach 🇺🇦 907 126 10ms 13 May 2023 90th ZakkkkAttackkkk 🇵🇭 907 126 10ms 11 Nov 2023 93rd Shanethegamer 🇺🇸 907 146 125ms 8 May 2023 93rd ovs-code 🇩🇪 907 146 113ms 9 May 2023 93rd lynn 907 146 131ms 11 May 2023 93rd Sakisan 🇧🇪 907 146 135ms 26 Jun 2023 97th edsrzf 🇳🇿 904 150 597ms 19 Dec 2025 98th clockworknazo 902 135 4ms 23 Jun 2023 98th GrayJoKing 🇦🇺 902 135 7ms 9 Nov 2023 100th KasperKivimaeki 🇫🇮 902 177 283ms 8 Oct 2025 101st Sakisan 🇧🇪 901 116 1,024ms 25 May 2023 102nd ovs-code 🇩🇪 901 133 65ms 23 Mar 2024 103rd Seek64 🇩🇪 900 127 10ms 25 Jun 2025 104th rucin93 🇵🇱 899 148 2ms 6 Jan 2026 105th JayXon 🇺🇸 899 193 159ms 27 Mar 2025 106th Natanaelel 🇸🇪 898 69 5ms 24 Jun 2023 107th edsrzf 🇳🇿 896 142 109ms 17 Jun 2025 108th edsrzf 🇳🇿 896 143 6ms 17 Jun 2025 109th ovs-code 🇩🇪 894 99 1ms 3 May 2023 109th Shanethegamer 🇺🇸 894 99 2ms 14 Feb 2025 111th MeWhenI 🇻🇦 894 125 11ms 26 Feb 2025 112th GrayJoKing 🇦🇺 894 134 64ms 9 Dec 2025 113th edsrzf 🇳🇿 894 146 418ms 23 Jul 2025 114th pardouin 🇫🇷 893 115 2,683ms 21 Nov 2024 115th IanUtley 893 127 14ms 5 Dec 2023 116th b-illy 🇬🇧 893 128 10ms 15 Aug 2024 116th Bulmenisaurus 893 128 10ms 29 Jan 2025 116th ryyyn 🇺🇸 893 128 10ms 6 Feb 2026 119th JayXon 🇺🇸 893 157 2ms 9 Nov 2023 120th stefangimmillaro 892 95 1,369ms 24 May 2025 121st nwellnhof 🇩🇪 892 152 481ms 25 Sep 2025 122nd sean-niemann 🇺🇸 890 148 503ms 8 Jul 2025 123rd JayXon 🇺🇸 890 155 1,327ms 16 hours ago 124th AlephSquirrel 889 63 40ms 1 May 2023 125th ovs-code 🇩🇪 889 77 37ms 1 May 2023 125th prplz 🇦🇺 889 77 34ms 9 May 2023 127th emplv 🇱🇻 889 121 5ms 3 Jul 2023 128th Steffan153 🇫🇮 889 133 84ms 9 Jun 2023 129th edsrzf 🇳🇿 889 149 7ms 20 Feb 2025 130th sean-niemann 🇺🇸 888 94 755ms 6 Dec 2025 131st bizy-coder 888 109 458ms 11 Oct 2024 132nd edsrzf 🇳🇿 887 129 107ms 2 Dec 2025 133rd GrayJoKing 🇦🇺 887 146 38ms 23 May 2023 134th JayXon 🇺🇸 887 180 285ms 1 Nov 2023 135th hallvabo 🇳🇴 886 129 10ms 21 Oct 2023 135th 5cw 🇺🇸 886 129 10ms 2 Aug 2024 137th GrayJoKing 🇦🇺 886 139 10ms 20 Nov 2025 138th namelessiw 886 153 665ms 8 Oct 2025 138th Yax42 🇫🇷 886 153 396ms 14 Oct 2025 140th galloj 🇨🇿 885 100 2ms 8 May 2023 141st JayXon 🇺🇸 885 132 161ms 24 May 2025 142nd CLOStrophobic 🇮🇹 885 151 6ms 9 Feb 2025 142nd kg583 🇺🇸 885 151 6ms 10 Feb 2025 144th kg583 🇺🇸 884 150 9ms 13 Oct 2025 145th GrayJoKing 🇦🇺 883 121 143ms 12 Aug 2024 146th primo-ppcg 🇹🇭 883 145 4ms 21 Aug 2023 147th Steffan153 🇫🇮 883 150 127ms 21 May 2023 148th btnlq 882 120 413ms 9 May 2023 148th tomtheisen 🇺🇸 882 120 397ms 13 Feb 2025 148th Yax42 🇫🇷 882 120 460ms 2 Jun 2025 151st sean-niemann 🇺🇸 881 151 2ms 6 Jan 2026 152nd Shanethegamer 🇺🇸 881 154 357ms 24 Sep 2025 153rd Lydxn 🇨🇦 880 110 395ms 16 Jan 2024 154th dmrichwa 🇺🇸 879 127 9ms 28 May 2023 155th bzijlema 🇳🇱 879 130 10ms 23 Jul 2025 155th sean-niemann 🇺🇸 879 130 10ms 6 Feb 2026 157th Steffan153 🇫🇮 878 145 118ms 4 May 2023 158th Steffan153 🇫🇮 877 95 4ms 12 Feb 2026 159th Natanaelel 🇸🇪 876 101 1ms 5 May 2023 160th GrayJoKing 🇦🇺 876 135 77ms 22 May 2023 First Prev 81–160 of 858 Next Last