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?
Inventory Sequence 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 239th xnor-gate 887 73 171ms 23 Nov 2022 239th lynn 887 73 168ms 27 Jan 2023 239th Steffan153 🇫🇮 887 73 171ms 20 Feb 2023 239th jared-hughes 887 73 165ms 13 Sep 2023 245th JayXon 🇺🇸 887 82 454ms 22 Nov 2022 245th Steffan153 🇫🇮 887 82 475ms 14 Aug 2024 245th sean-niemann 🇺🇸 887 82 453ms 9 May 2025 248th canissimia 🇦🇶 887 192 3ms 7 Dec 2022 249th Lydxn 🇨🇦 886 98 24ms 27 Jun 2023 250th zacjl 885 84 53ms 14 Feb 2025 250th kg583 🇺🇸 885 84 56ms 80 mins ago 252nd emgordon154 884 53 468ms 17 May 2025 253rd GrayJoKing 🇦🇺 884 74 8ms 23 Jul 2023 254th DialFrost 🇸🇬 884 75 453ms 25 Mar 2025 255th btnlq 884 85 362ms 11 Mar 2023 255th stefangimmillaro 884 85 387ms 1 Apr 2023 257th lynn 883 95 1,357ms 17 Feb 2023 258th primo-ppcg 🇹🇭 882 41 46ms 25 Nov 2022 259th janbehrens 🇩🇪 882 56 11ms 21 Nov 2022 259th edsrzf 🇳🇿 882 56 11ms 27 Aug 2025 259th JOrE20 882 56 11ms 25 Feb 2026 262nd prplz 🇦🇺 881 56 37ms 20 Nov 2022 262nd Shanethegamer 🇺🇸 881 56 35ms 22 Nov 2022 262nd KatieLG 🇬🇧 881 56 32ms 7 Jan 2026 265th MeWhenI 🇻🇦 881 90 459ms 7 Nov 2025 266th ovs-code 🇩🇪 881 100 7ms 31 Mar 2023 267th GrayJoKing 🇦🇺 880 107 29ms 26 Jun 2023 268th janbehrens 🇩🇪 879 87 65ms 20 Nov 2022 268th MeWhenI 🇻🇦 879 87 58ms 22 Jul 2024 270th ovs-code 🇩🇪 879 98 139ms 21 Jun 2023 271st Steffan153 🇫🇮 878 56 95ms 15 Aug 2024 272nd Shanethegamer 🇺🇸 878 73 314ms 24 Nov 2022 272nd Steffan153 🇫🇮 878 73 334ms 1 Dec 2022 274th MeWhenI 🇻🇦 878 75 96ms 8 Mar 2023 275th edsrzf 🇳🇿 877 50 1,106ms 22 Nov 2025 275th sean-niemann 🇺🇸 877 50 758ms 6 Dec 2025 275th Steffan153 🇫🇮 877 50 842ms 13 Feb 2026 278th ovs-code 🇩🇪 877 66 2ms 20 Nov 2022 278th sisyphus-ppcg 🇦🇺 877 66 2ms 22 Nov 2022 278th inventshah 877 66 2ms 3 Feb 2024 281st clockworknazo 877 67 4ms 30 Aug 2023 282nd ovs-code 🇩🇪 876 83 455ms 23 Jul 2024 283rd primo-ppcg 🇹🇭 875 71 40ms 24 Nov 2022 283rd Steffan153 🇫🇮 875 71 40ms 9 Apr 2023 285th Steffan153 🇫🇮 875 95 114ms 27 days ago 286th primo-ppcg 🇹🇭 874 66 251ms 30 Apr 2023 286th Lydxn 🇨🇦 874 66 251ms 28 Aug 2023 286th kg583 🇺🇸 874 66 249ms 106 mins ago 289th janbehrens 🇩🇪 874 86 375ms 20 Nov 2022 289th tomtheisen 🇺🇸 874 86 374ms 4 Dec 2022 289th MeWhenI 🇻🇦 874 86 391ms 8 Dec 2022 289th annaproxy 874 86 374ms 11 Dec 2022 289th AdrienHache 🇫🇷 874 86 422ms 17 Dec 2024 289th Yax42 🇫🇷 874 86 398ms 31 May 2025 289th DialFrost 🇸🇬 874 86 426ms 20 Nov 2025 296th Steffan153 🇫🇮 874 96 1,287ms 10 Apr 2023 297th canissimia 🇦🇶 874 130 1,802ms 6 Mar 2023 298th HPWiz 🇳🇿 873 37 3ms 22 Nov 2022 299th dvargas46 🇺🇸 873 46 1ms 21 Nov 2022 299th DialFrost 🇸🇬 873 46 2ms 20 Nov 2025 301st duckyluuk 🇳🇱 873 55 16ms 17 Dec 2024 301st DialFrost 🇸🇬 873 55 15ms 17 Dec 2024 303rd GrayJoKing 🇦🇺 873 79 93ms 11 Dec 2022 304th pardouin 🇫🇷 872 76 2,599ms 12 Sep 2025 305th m-tkach 🇺🇦 872 143 201ms 1 Apr 2023 306th JayXon 🇺🇸 871 44 1,261ms 19 Feb 2023 306th stefangimmillaro 871 44 1,296ms 29 Apr 2023 308th lifthrasiir 🇰🇷 870 24 2ms 28 Nov 2024 309th primo-ppcg 🇹🇭 870 43 6ms 21 Nov 2022 309th Steffan153 🇫🇮 870 43 6ms 14 Aug 2024 311th GrayJoKing 🇦🇺 870 82 9ms 6 days ago 312th JayXon 🇺🇸 870 160 1,642ms 15 Sep 2025 313th Steffan153 🇫🇮 869 56 389ms 15 Aug 2024 314th Shanethegamer 🇺🇸 869 76 128ms 21 Jun 2024 315th MeWhenI 🇻🇦 869 84 26ms 23 Feb 2026 316th GolfingSuccess 🇬🇷 869 88 60ms 20 Nov 2022 316th Shanethegamer 🇺🇸 869 88 60ms 22 Nov 2022 316th ovs-code 🇩🇪 869 88 56ms 3 Jun 2024 316th luuumine 🇫🇷 869 88 61ms 17 Nov 2025 320th nwellnhof 🇩🇪 868 31 242ms 25 Jun 2023 First Prev 241–320 of 1,667 Next Last