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?
Spelling Numbers in all languages in chars. 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 Chars Time Submitted 79th juntuu 941 51 11ms 28 Mar 2019 79th yzhs 🇩🇪 941 51 9ms 29 Feb 2020 79th cameroncondry 941 51 12ms 7 Apr 2021 79th c0d3-4-F00d 🇩🇪 941 51 9ms 2 Jun 2021 79th klixel 🇨🇦 941 51 11ms 27 Oct 2024 86th Steffan153 🇫🇮 937 86 28ms 24 May 2024 86th emgordon154 937 86 31ms 29 Jul 2025 86th edsrzf 🇳🇿 937 86 18ms 16 Aug 2025 86th sean-niemann 🇺🇸 937 86 30ms 17 Aug 2025 86th DialFrost 🇸🇬 937 86 18ms 2 Jan 2026 86th kg583 🇺🇸 937 86 20ms 19 Feb 2026 92nd Steffan153 🇫🇮 937 119 36ms 15 Jul 2024 93rd JayXon 🇺🇸 930 113 363ms 5 Feb 2026 94th tomtheisen 🇺🇸 930 179 11ms 17 Oct 2020 95th kg583 🇺🇸 929 120 37ms 23 Nov 2024 95th sean-niemann 🇺🇸 929 120 33ms 5 Feb 2026 97th primo-ppcg 🇹🇭 928 125 192ms 16 Oct 2018 98th dokutan 926 87 29ms 1 Jul 2024 99th rucin93 🇵🇱 924 180 13ms 17 Oct 2020 99th Irratix 🇳🇱 924 180 16ms 7 Dec 2020 99th sean-niemann 🇺🇸 924 180 13ms 19 Jan 2025 102nd sisyphus-ppcg 🇦🇺 922 103 8ms 22 May 2022 103rd pardouin 🇫🇷 921 121 35ms 12 Jul 2024 104th b-illy 🇬🇧 914 122 35ms 2 Aug 2024 105th bitsandbeyond 🇳🇱 907 148 523ms 23 Feb 2026 106th MeWhenI 🇻🇦 907 263 646ms 7 Nov 2025 107th duikboot 906 53 10ms 28 Apr 2018 108th JayXon 🇺🇸 906 293 477ms 24 Jan 2025 109th MeWhenI 🇻🇦 905 89 18ms 9 May 2024 110th primo-ppcg 🇹🇭 905 105 4ms 9 Oct 2018 111th KasperKivimaeki 🇫🇮 901 240 4ms 15 Oct 2025 112th ETHproductions 🇺🇸 900 185 13ms 19 Dec 2018 113th btnlq 899 124 22ms 10 Dec 2021 114th sean-niemann 🇺🇸 898 117 401ms 5 Feb 2026 114th Steffan153 🇫🇮 898 117 384ms 25 days ago 116th AdrienHache 🇫🇷 897 296 500ms 19 days ago 117th MeWhenI 🇻🇦 894 113 303ms 25 Aug 2022 117th edsrzf 🇳🇿 894 113 44ms 7 Apr 2025 119th inventshah 893 294 3,280ms 4 Feb 2023 120th JayXon 🇺🇸 892 152 911ms 12 Mar 2023 121st Shanethegamer 🇺🇸 891 154 829ms 6 Apr 2022 122nd GrayJoKing 🇦🇺 891 212 6ms 23 Jul 2024 123rd kg583 🇺🇸 890 118 379ms 5 Feb 2026 123rd pardouin 🇫🇷 890 118 469ms 5 Feb 2026 125th kg583 🇺🇸 887 114 39ms 14 Feb 2025 125th GolfingSuccess 🇬🇷 887 114 43ms 8 Mar 2025 127th Lydxn 🇨🇦 886 153 918ms 12 Mar 2023 128th primo-ppcg 🇹🇭 885 126 20ms 3 Feb 2020 129th HPWiz 🇳🇿 885 335 229ms 13 Jul 2023 130th Waffle3z 883 214 3ms 8 Apr 2022 131st inventshah 883 245 6ms 5 Jun 2025 132nd Shanethegamer 🇺🇸 883 310 11ms 18 Mar 2024 133rd lynn 883 336 228ms 30 Mar 2021 134th primo-ppcg 🇹🇭 880 311 10ms 4 Jul 2023 135th JayXon 🇺🇸 879 162 141ms 11 Sep 2024 136th kkoenig 878 416 292ms 10 Sep 2025 137th saito-ta 🇯🇵 877 199 2,097ms 30 Jan 2024 138th thisishowmymindworks 🇳🇴 876 190 12ms 24 May 2023 138th emplv 🇱🇻 876 190 11ms 19 Jan 2025 140th JayXon 🇺🇸 876 407 261ms 15 Oct 2025 140th acotis 876 407 231ms 18 Oct 2025 142nd MostParsingVex 873 55 11ms 23 Oct 2024 143rd canissimia 🇦🇶 869 249 3ms 4 Jan 2026 144th JayXon 🇺🇸 869 276 1,366ms 19 Aug 2022 145th SirBogman 🇺🇸 867 86 656ms 23 Jan 2024 146th primo-ppcg 🇹🇭 867 192 10ms 13 Sep 2019 146th vlpx 🇫🇮 867 192 13ms 1 Aug 2024 148th ovs-code 🇩🇪 867 237 35ms 17 Jan 2025 149th canissimia 🇦🇶 866 220 2,850ms 20 Mar 2023 150th ovs-code 🇩🇪 864 209 4ms 18 Jan 2025 151st MeWhenI 🇻🇦 863 278 1,427ms 17 Aug 2022 152nd Alex-x90 🇺🇸 863 304 497ms 27 Sep 2025 153rd GrayJoKing 🇦🇺 862 217 12ms 1 Nov 2023 154th Alex-x90 🇺🇸 862 251 17ms 21 Nov 2025 155th janlelis 860 279 1,286ms 17 Aug 2022 156th albanian-laundromat 859 184 1,390ms 4 Nov 2025 157th sean-niemann 🇺🇸 859 268 1,033ms 26 Nov 2024 158th emgordon154 858 194 13ms 1 Aug 2024 159th massung 857 56 9ms 26 Mar 2019 159th CatsAreFluffy 857 56 11ms 15 Dec 2022 First Prev 81–160 of 1,079 Next Last