The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 241st JayXon 🇺🇸 887 82 454ms 22 Nov 2022 241st Steffan153 🇫🇮 887 82 475ms 14 Aug 2024 241st sean-niemann 🇺🇸 887 82 453ms 9 May 2025 244th canissimia 🇦🇶 887 192 3ms 7 Dec 2022 245th Lydxn 🇨🇦 886 98 24ms 27 Jun 2023 246th zacjl 885 84 53ms 14 Feb 2025 247th emgordon154 884 53 468ms 17 May 2025 248th GrayJoKing 🇦🇺 884 74 8ms 23 Jul 2023 249th DialFrost 🇸🇬 884 75 453ms 25 Mar 2025 250th btnlq 884 85 362ms 11 Mar 2023 250th stefangimmillaro 884 85 387ms 1 Apr 2023 252nd lynn 883 95 1,357ms 17 Feb 2023 253rd primo-ppcg 🇹🇭 882 41 46ms 25 Nov 2022 254th janbehrens 🇩🇪 882 56 12ms 21 Nov 2022 254th edsrzf 🇳🇿 882 56 9ms 27 Aug 2025 254th JOrE20 882 56 10ms 26 days ago 257th prplz 🇦🇺 881 56 37ms 20 Nov 2022 257th Shanethegamer 🇺🇸 881 56 35ms 22 Nov 2022 257th KatieLG 🇬🇧 881 56 32ms 7 Jan 2026 260th MeWhenI 🇻🇦 881 90 459ms 7 Nov 2025 261st ovs-code 🇩🇪 881 100 7ms 31 Mar 2023 262nd GrayJoKing 🇦🇺 880 107 29ms 26 Jun 2023 263rd janbehrens 🇩🇪 879 87 57ms 20 Nov 2022 263rd MeWhenI 🇻🇦 879 87 59ms 22 Jul 2024 265th ovs-code 🇩🇪 879 98 139ms 21 Jun 2023 266th Steffan153 🇫🇮 878 56 95ms 15 Aug 2024 267th Shanethegamer 🇺🇸 878 73 314ms 24 Nov 2022 267th Steffan153 🇫🇮 878 73 334ms 1 Dec 2022 269th MeWhenI 🇻🇦 878 75 96ms 8 Mar 2023 270th edsrzf 🇳🇿 877 50 1,106ms 22 Nov 2025 270th sean-niemann 🇺🇸 877 50 758ms 6 Dec 2025 270th Steffan153 🇫🇮 877 50 842ms 13 Feb 2026 273rd ovs-code 🇩🇪 877 66 2ms 20 Nov 2022 273rd sisyphus-ppcg 🇦🇺 877 66 2ms 22 Nov 2022 273rd inventshah 877 66 2ms 3 Feb 2024 276th clockworknazo 877 67 4ms 30 Aug 2023 277th ovs-code 🇩🇪 876 83 455ms 23 Jul 2024 278th primo-ppcg 🇹🇭 875 71 40ms 24 Nov 2022 278th Steffan153 🇫🇮 875 71 40ms 9 Apr 2023 280th Steffan153 🇫🇮 875 95 114ms 23 days ago 281st janbehrens 🇩🇪 874 86 375ms 20 Nov 2022 281st tomtheisen 🇺🇸 874 86 374ms 4 Dec 2022 281st MeWhenI 🇻🇦 874 86 391ms 8 Dec 2022 281st annaproxy 874 86 374ms 11 Dec 2022 281st AdrienHache 🇫🇷 874 86 422ms 17 Dec 2024 281st Yax42 🇫🇷 874 86 398ms 31 May 2025 281st DialFrost 🇸🇬 874 86 426ms 20 Nov 2025 288th Steffan153 🇫🇮 874 96 1,287ms 10 Apr 2023 289th canissimia 🇦🇶 874 130 1,802ms 6 Mar 2023 290th HPWiz 🇳🇿 873 37 3ms 22 Nov 2022 291st dvargas46 🇺🇸 873 46 1ms 21 Nov 2022 291st DialFrost 🇸🇬 873 46 2ms 20 Nov 2025 293rd duckyluuk 🇳🇱 873 55 16ms 17 Dec 2024 293rd DialFrost 🇸🇬 873 55 15ms 17 Dec 2024 295th primo-ppcg 🇹🇭 873 66 251ms 30 Apr 2023 295th Lydxn 🇨🇦 873 66 251ms 28 Aug 2023 297th GrayJoKing 🇦🇺 873 79 93ms 11 Dec 2022 298th m-tkach 🇺🇦 872 143 201ms 1 Apr 2023 299th JayXon 🇺🇸 871 44 1,261ms 19 Feb 2023 299th stefangimmillaro 871 44 1,296ms 29 Apr 2023 301st lifthrasiir 🇰🇷 870 24 2ms 28 Nov 2024 302nd primo-ppcg 🇹🇭 870 43 6ms 21 Nov 2022 302nd Steffan153 🇫🇮 870 43 6ms 14 Aug 2024 304th pardouin 🇫🇷 870 76 2,599ms 12 Sep 2025 305th JayXon 🇺🇸 870 160 1,642ms 15 Sep 2025 306th Steffan153 🇫🇮 869 56 389ms 15 Aug 2024 307th Shanethegamer 🇺🇸 869 76 128ms 21 Jun 2024 308th MeWhenI 🇻🇦 869 84 26ms 23 Feb 2026 309th GolfingSuccess 🇬🇷 869 88 56ms 20 Nov 2022 309th Shanethegamer 🇺🇸 869 88 62ms 22 Nov 2022 309th ovs-code 🇩🇪 869 88 58ms 3 Jun 2024 309th luuumine 🇫🇷 869 88 60ms 17 Nov 2025 313th nwellnhof 🇩🇪 868 31 242ms 25 Jun 2023 314th neel11235813 868 54 400ms 27 Mar 2024 314th DialFrost 🇸🇬 868 54 387ms 2 Aug 2024 314th lifthrasiir 🇰🇷 868 54 429ms 2 Dec 2024 314th ovs-code 🇩🇪 868 54 483ms 15 Jul 2025 318th Natanaelel 🇸🇪 867 28 34ms 3 Nov 2023 318th SirBogman 🇺🇸 867 28 35ms 14 Feb 2024 320th didion0 🇺🇸 867 57 10ms 22 Feb 2023 First Prev 241–320 of 1,662 Next Last