The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 hours. Why not try and solve them ahead of time?
Ordinal Numbers 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 477th AlephSquirrel 861 36 62ms 14 Jan 2024 477th pardouin 🇫🇷 861 36 225ms 26 Oct 2024 477th emgordon154 861 36 60ms 6 Sep 2025 484th inventshah 861 58 7ms 14 May 2022 484th frankgraziano 861 58 9ms 25 Apr 2025 486th sisyphus-ppcg 🇦🇺 860 50 2ms 3 Nov 2022 486th MeWhenI 🇻🇦 860 50 2ms 4 Nov 2022 486th Steffan153 🇫🇮 860 50 2ms 19 Dec 2022 486th DialFrost 🇸🇬 860 50 2ms 28 Jan 2023 490th prplz 🇦🇺 860 54 37ms 15 Feb 2021 490th primo-ppcg 🇹🇭 860 54 37ms 16 Feb 2021 492nd edsrzf 🇳🇿 859 118 115ms 28 Nov 2025 493rd acodon 858 86 3ms 11 Jul 2019 493rd DaDerpDuck 858 86 2ms 22 Jan 2021 495th JayXon 🇺🇸 858 180 1,723ms 22 Apr 2024 496th emgordon154 858 212 1,429ms 30 Mar 2025 497th marcin7Cd 857 91 12ms 22 Apr 2020 497th vezzick 857 91 13ms 11 Mar 2021 497th neihousaigaai 857 91 13ms 8 May 2021 497th thatbirdguythatuknownot 857 91 13ms 2 Jan 2023 497th firegene 🇮🇪 857 91 13ms 3 Jan 2023 497th AlephSquirrel 857 91 12ms 6 Jan 2023 497th AlexanderFair 857 91 12ms 13 Jul 2023 497th cefqrn 857 91 12ms 19 Jun 2024 497th Bulmenisaurus 857 91 13ms 9 Jul 2024 497th Mukundan314 857 91 12ms 26 Apr 2025 497th FoxInTheClouds 857 91 12ms 13 Feb 2026 497th KasperKivimaeki 🇫🇮 857 91 18ms 27 Feb 2026 509th jipsong 🇩🇪 857 102 171ms 9 Jun 2025 510th sean-niemann 🇺🇸 856 113 447ms 6 Feb 2022 510th nwellnhof 🇩🇪 856 113 439ms 21 Jun 2022 510th ovs-code 🇩🇪 856 113 443ms 3 Jun 2024 513th MeWhenI 🇻🇦 855 89 111ms 15 Oct 2022 513th Steffan153 🇫🇮 855 89 115ms 18 Oct 2022 513th stefangimmillaro 855 89 113ms 21 Oct 2022 513th sean-niemann 🇺🇸 855 89 118ms 25 May 2025 517th Attero 🇸🇪 855 94 2ms 24 May 2020 517th inventshah 855 94 2ms 25 Apr 2023 519th Yax42 🇫🇷 855 96 463ms 17 Dec 2024 520th stefangimmillaro 855 106 105ms 7 Oct 2022 520th primo-ppcg 🇹🇭 855 106 108ms 12 Apr 2025 522nd arjanadriaanse 🇳🇱 855 133 178ms 15 Nov 2021 523rd lifthrasiir 🇰🇷 855 172 51ms 13 Dec 2024 524th marcin7Cd 854 87 24ms 8 Feb 2021 525th Steffan153 🇫🇮 854 128 27ms 3 Mar 2026 526th moikaturns 🇬🇧 853 75 11ms 8 Dec 2022 526th biocommando 🇫🇮 853 75 11ms 29 Dec 2022 528th ovs-code 🇩🇪 853 77 446ms 16 Jan 2024 528th DialFrost 🇸🇬 853 77 389ms 16 Jan 2024 528th rucin93 🇵🇱 853 77 507ms 16 Jan 2024 528th neel11235813 853 77 499ms 16 Jan 2024 528th Shanethegamer 🇺🇸 853 77 444ms 17 Jan 2024 528th bizy-coder 853 77 440ms 17 Jan 2024 528th GrayJoKing 🇦🇺 853 77 463ms 17 Jan 2024 528th m-tkach 🇺🇦 853 77 428ms 20 Jan 2024 528th xsot 🇸🇬 853 77 469ms 25 Jan 2024 528th Yewzir 🇧🇪 853 77 452ms 4 Feb 2024 528th kg583 🇺🇸 853 77 420ms 5 Feb 2026 528th sean-niemann 🇺🇸 853 77 384ms 5 Feb 2026 528th pardouin 🇫🇷 853 77 540ms 5 Feb 2026 541st sean-niemann 🇺🇸 853 79 3ms 17 Jan 2024 541st Steffan153 🇫🇮 853 79 3ms 29 Jan 2024 543rd kg583 🇺🇸 853 94 5ms 29 Nov 2025 544th angel-p57 🇯🇵 852 120 4ms 11 Dec 2023 544th edsrzf 🇳🇿 852 120 77ms 8 days ago 546th primo-ppcg 🇹🇭 851 77 258ms 22 Oct 2020 547th ovs-code 🇩🇪 851 78 6ms 10 Feb 2023 547th GrayJoKing 🇦🇺 851 78 6ms 20 Mar 2023 549th DialFrost 🇸🇬 851 118 372ms 24 Sep 2025 549th sean-niemann 🇺🇸 851 118 534ms 24 Sep 2025 549th nwellnhof 🇩🇪 851 118 616ms 25 Sep 2025 549th MeWhenI 🇻🇦 851 118 557ms 7 Nov 2025 549th Steffan153 🇫🇮 851 118 414ms 11 Feb 2026 554th GrayJoKing 🇦🇺 850 105 10ms 3 Mar 2026 555th GrayJoKing 🇦🇺 850 109 22ms 24 Nov 2021 556th Shanethegamer 🇺🇸 850 117 515ms 19 Jan 2024 556th DialFrost 🇸🇬 850 117 467ms 2 Dec 2024 558th okhoel 🇳🇴 849 63 277ms 20 Sep 2022 559th guliyevemil1 🇦🇿 849 146 289ms 16 Apr 2020 559th MeWhenI 🇻🇦 849 146 296ms 8 Feb 2023 First Prev 481–560 of 1,904 Next Last