The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. 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 159th sean-niemann 🇺🇸 879 109 534ms 9 Aug 2024 159th prplz 🇦🇺 879 109 484ms 23 Jan 2025 163rd kumavale 878 155 181ms 29 Aug 2025 164th AlephSquirrel 878 160 6ms 21 Oct 2024 165th GrayJoKing 🇦🇺 877 65 188ms 23 Aug 2021 165th Steffan153 🇫🇮 877 65 192ms 31 May 2024 167th edsrzf 🇳🇿 877 105 148ms 20 Feb 2026 167th Steffan153 🇫🇮 877 105 138ms 15 days ago 169th MeWhenI 🇻🇦 875 60 3ms 15 Dec 2021 170th edsrzf 🇳🇿 875 87 2,434ms 19 Feb 2026 171st GrayJoKing 🇦🇺 875 106 5ms 1 Aug 2023 172nd inventshah 875 109 14ms 20 Jul 2023 173rd primo-ppcg 🇹🇭 875 122 504ms 29 Nov 2022 173rd MeWhenI 🇻🇦 875 122 430ms 25 Dec 2022 175th lynn 875 137 19ms 14 Jan 2022 176th GrayJoKing 🇦🇺 873 109 11ms 23 days ago 176th edsrzf 🇳🇿 873 109 11ms 23 days ago 178th GrayJoKing 🇦🇺 873 119 9ms 27 Nov 2025 179th m-tkach 🇺🇦 873 140 31ms 21 Jun 2022 180th emgordon154 871 96 645ms 16 Nov 2025 180th dokutan 871 96 551ms 15 days ago 182nd Shanethegamer 🇺🇸 871 104 208ms 24 May 2025 182nd sean-niemann 🇺🇸 871 104 212ms 25 May 2025 184th MeWhenI 🇻🇦 871 124 6ms 7 Dec 2022 185th 5cw 🇺🇸 870 46 5ms 16 May 2023 186th m-tkach 🇺🇦 870 136 4ms 14 Mar 2023 187th Steffan153 🇫🇮 870 149 38ms 31 May 2024 188th pardouin 🇫🇷 869 79 61ms 26 Jun 2025 189th inventshah 869 126 62ms 20 Jul 2023 190th emplv 🇱🇻 869 147 388ms 18 Jan 2022 191st primo-ppcg 🇹🇭 867 146 42ms 11 Jun 2025 192nd primo-ppcg 🇹🇭 867 162 10ms 20 Jan 2023 192nd edsrzf 🇳🇿 867 162 30ms 19 Feb 2026 194th sean-niemann 🇺🇸 866 118 527ms 18 Sep 2023 195th Waffle3z 865 98 15ms 25 Aug 2021 195th itsh01 865 98 14ms 16 Nov 2021 197th emgordon154 864 103 5ms 4 Sep 2025 198th Steffan153 🇫🇮 864 140 192ms 26 days ago 199th JayXon 🇺🇸 863 79 684ms 30 Jul 2024 200th MeWhenI 🇻🇦 863 111 487ms 8 Dec 2022 201st Shanethegamer 🇺🇸 862 97 731ms 16 Jan 2024 201st AlephSquirrel 862 97 739ms 21 Jan 2024 201st m-tkach 🇺🇦 862 97 647ms 29 Jan 2024 201st MeWhenI 🇻🇦 862 97 676ms 24 May 2024 205th sean-niemann 🇺🇸 859 106 4,501ms 7 Jan 2026 206th fgrosshans 🇫🇷 859 111 11ms 22 Jul 2024 207th GrayJoKing 🇦🇺 859 151 34ms 25 Aug 2023 208th orthoplex 🇨🇽 858 80 43ms 1 Apr 2022 208th GrayJoKing 🇦🇺 858 80 53ms 7 Jul 2023 208th prplz 🇦🇺 858 80 36ms 29 Jan 2024 211th GrayJoKing 🇦🇺 858 109 2ms 19 Jan 2023 211th MeWhenI 🇻🇦 858 109 2ms 20 Feb 2023 213th lynn 858 137 1,560ms 30 Nov 2021 214th namelessiw 856 112 510ms 8 Jun 2024 215th lynn 856 159 185ms 28 Oct 2025 216th primo-ppcg 🇹🇭 855 89 1,907ms 18 Sep 2021 217th edsrzf 🇳🇿 855 193 50ms 18 Feb 2026 218th snoozingnewt 🇨🇦 854 98 483ms 26 days ago 219th ovs-code 🇩🇪 853 101 2ms 4 May 2022 219th inventshah 853 101 2ms 20 Jul 2023 219th Steffan153 🇫🇮 853 101 2ms 18 Jul 2024 219th KasperKivimaeki 🇫🇮 853 101 2ms 2 Apr 2025 223rd sean-niemann 🇺🇸 853 112 43ms 18 Sep 2023 224th MeWhenI 🇻🇦 853 148 3ms 12 Sep 2022 225th emplv 🇱🇻 852 94 8ms 23 Aug 2021 226th sean-niemann 🇺🇸 852 132 661ms 24 Sep 2025 227th Shanethegamer 🇺🇸 852 150 384ms 23 Jun 2022 228th Shanethegamer 🇺🇸 852 165 9ms 27 Dec 2021 229th Shanethegamer 🇺🇸 851 120 508ms 14 Jul 2023 230th primo-ppcg 🇹🇭 850 111 5ms 30 Aug 2023 231st primo-ppcg 🇹🇭 849 144 32ms 4 Mar 2022 231st emplv 🇱🇻 849 144 26ms 30 Nov 2022 233rd stefangimmillaro 848 81 52ms 28 Jan 2022 233rd ovs-code 🇩🇪 848 81 36ms 9 May 2023 235th MeWhenI 🇻🇦 848 129 64ms 7 May 2023 235th ovs-code 🇩🇪 848 129 75ms 8 Jun 2024 237th error256 847 121 88ms 10 Dec 2025 238th sean-niemann 🇺🇸 846 90 1,815ms 26 Jul 2024 239th jared-hughes 844 113 13ms 22 Apr 2022 239th lifthrasiir 🇰🇷 844 113 13ms 12 Nov 2024 First Prev 161–240 of 1,328 Next Last