The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Arrows 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 161st kumavale 878 155 174ms 29 Aug 2025 162nd AlephSquirrel 878 160 6ms 21 Oct 2024 163rd GrayJoKing 🇦🇺 877 65 220ms 23 Aug 2021 163rd Steffan153 🇫🇮 877 65 246ms 31 May 2024 165th edsrzf 🇳🇿 877 105 148ms 20 Feb 2026 165th Steffan153 🇫🇮 877 105 138ms 18 days ago 167th MeWhenI 🇻🇦 875 60 3ms 15 Dec 2021 168th edsrzf 🇳🇿 875 87 2,434ms 19 Feb 2026 169th GrayJoKing 🇦🇺 875 106 5ms 1 Aug 2023 170th inventshah 875 109 14ms 20 Jul 2023 171st primo-ppcg 🇹🇭 875 122 504ms 29 Nov 2022 171st MeWhenI 🇻🇦 875 122 430ms 25 Dec 2022 173rd lynn 875 137 19ms 14 Jan 2022 174th GrayJoKing 🇦🇺 873 109 11ms 26 days ago 174th edsrzf 🇳🇿 873 109 10ms 26 days ago 176th GrayJoKing 🇦🇺 873 119 9ms 27 Nov 2025 177th m-tkach 🇺🇦 873 140 31ms 21 Jun 2022 178th emgordon154 871 96 645ms 16 Nov 2025 178th dokutan 871 96 551ms 18 days ago 180th Shanethegamer 🇺🇸 871 104 208ms 24 May 2025 180th sean-niemann 🇺🇸 871 104 212ms 25 May 2025 182nd MeWhenI 🇻🇦 871 124 6ms 7 Dec 2022 183rd 5cw 🇺🇸 870 46 5ms 16 May 2023 184th m-tkach 🇺🇦 870 136 4ms 14 Mar 2023 185th Steffan153 🇫🇮 870 149 38ms 31 May 2024 186th pardouin 🇫🇷 869 79 61ms 26 Jun 2025 187th inventshah 869 126 62ms 20 Jul 2023 188th emplv 🇱🇻 869 147 388ms 18 Jan 2022 189th primo-ppcg 🇹🇭 867 146 42ms 11 Jun 2025 190th primo-ppcg 🇹🇭 867 162 10ms 20 Jan 2023 190th edsrzf 🇳🇿 867 162 30ms 19 Feb 2026 192nd sean-niemann 🇺🇸 866 118 527ms 18 Sep 2023 193rd Waffle3z 865 98 15ms 25 Aug 2021 193rd itsh01 865 98 14ms 16 Nov 2021 195th emgordon154 864 103 5ms 4 Sep 2025 196th Steffan153 🇫🇮 864 140 192ms 28 Feb 2026 197th JayXon 🇺🇸 863 79 684ms 30 Jul 2024 198th MeWhenI 🇻🇦 863 111 487ms 8 Dec 2022 199th Shanethegamer 🇺🇸 862 97 731ms 16 Jan 2024 199th AlephSquirrel 862 97 739ms 21 Jan 2024 199th m-tkach 🇺🇦 862 97 647ms 29 Jan 2024 199th MeWhenI 🇻🇦 862 97 676ms 24 May 2024 203rd fgrosshans 🇫🇷 859 111 11ms 22 Jul 2024 204th GrayJoKing 🇦🇺 859 151 34ms 25 Aug 2023 205th orthoplex 🇨🇽 858 80 43ms 1 Apr 2022 205th GrayJoKing 🇦🇺 858 80 53ms 7 Jul 2023 205th prplz 🇦🇺 858 80 36ms 29 Jan 2024 208th GrayJoKing 🇦🇺 858 109 2ms 19 Jan 2023 208th MeWhenI 🇻🇦 858 109 2ms 20 Feb 2023 210th lynn 858 137 1,560ms 30 Nov 2021 211th namelessiw 856 112 510ms 8 Jun 2024 212th lynn 856 159 185ms 28 Oct 2025 213th primo-ppcg 🇹🇭 855 89 1,907ms 18 Sep 2021 214th edsrzf 🇳🇿 855 193 50ms 18 Feb 2026 215th snoozingnewt 🇨🇦 854 98 483ms 28 Feb 2026 216th ovs-code 🇩🇪 853 101 2ms 4 May 2022 216th inventshah 853 101 2ms 20 Jul 2023 216th Steffan153 🇫🇮 853 101 2ms 18 Jul 2024 216th KasperKivimaeki 🇫🇮 853 101 2ms 2 Apr 2025 220th sean-niemann 🇺🇸 853 112 43ms 18 Sep 2023 221st MeWhenI 🇻🇦 853 148 3ms 12 Sep 2022 222nd emplv 🇱🇻 852 94 8ms 23 Aug 2021 223rd sean-niemann 🇺🇸 852 132 661ms 24 Sep 2025 224th Shanethegamer 🇺🇸 852 150 384ms 23 Jun 2022 225th Shanethegamer 🇺🇸 852 165 9ms 27 Dec 2021 226th Shanethegamer 🇺🇸 851 120 508ms 14 Jul 2023 227th primo-ppcg 🇹🇭 850 111 5ms 30 Aug 2023 228th primo-ppcg 🇹🇭 849 144 32ms 4 Mar 2022 228th emplv 🇱🇻 849 144 26ms 30 Nov 2022 230th stefangimmillaro 848 81 52ms 28 Jan 2022 230th ovs-code 🇩🇪 848 81 36ms 9 May 2023 232nd MeWhenI 🇻🇦 848 129 60ms 7 May 2023 232nd ovs-code 🇩🇪 848 129 75ms 8 Jun 2024 234th error256 847 121 88ms 10 Dec 2025 235th sean-niemann 🇺🇸 846 90 1,815ms 26 Jul 2024 236th jared-hughes 844 113 13ms 22 Apr 2022 236th lifthrasiir 🇰🇷 844 113 13ms 12 Nov 2024 238th canissimia 🇦🇶 844 218 5ms 4 Mar 2023 239th MWI-polygolf 843 111 2ms 6 Dec 2023 240th sean-niemann 🇺🇸 842 101 3ms 7 Dec 2025 First Prev 161–240 of 1,320 Next Last