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?
Catalan 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 641st inventshah 865 127 456ms 5 May 2024 642nd MeWhenI 🇻🇦 864 59 3ms 1 Oct 2022 642nd DialFrost 🇸🇬 864 59 3ms 11 Feb 2023 642nd edsrzf 🇳🇿 864 59 3ms 28 Aug 2025 645th ovs-code 🇩🇪 864 72 468ms 27 Feb 2022 645th GrayJoKing 🇦🇺 864 72 461ms 28 Feb 2022 647th stefangimmillaro 863 136 301ms 9 Sep 2023 647th cduerm 863 136 298ms 19 Sep 2025 647th sean-niemann 🇺🇸 863 136 293ms 21 Sep 2025 650th rucin93 🇵🇱 862 191 389ms 17 Dec 2025 651st primo-ppcg 🇹🇭 862 348 12ms 13 Aug 2025 652nd DialFrost 🇸🇬 861 71 124ms 5 Dec 2025 652nd emgordon154 861 71 122ms 5 Dec 2025 652nd GolfingSuccess 🇬🇷 861 71 122ms 12 Dec 2025 652nd Steffan153 🇫🇮 861 71 115ms 27 Feb 2026 656th ovs-code 🇩🇪 861 138 673ms 19 Dec 2025 657th ovs-code 🇩🇪 861 276 17ms 8 Jul 2024 658th m-tkach 🇺🇦 861 372 104ms 20 Jun 2025 659th lifthrasiir 🇰🇷 859 45 446ms 2 Dec 2024 660th stefangimmillaro 859 191 118ms 3 May 2023 661st sean-niemann 🇺🇸 858 128 464ms 4 May 2024 662nd edsrzf 🇳🇿 858 131 1,674ms 13 Sep 2025 662nd ovs-code 🇩🇪 858 131 1,778ms 14 Sep 2025 662nd GolfingSuccess 🇬🇷 858 131 1,708ms 17 Sep 2025 662nd MeWhenI 🇻🇦 858 131 1,686ms 7 Nov 2025 666th jrm5399 🇰🇿 857 50 10ms 30 Jan 2022 666th Freddiechang 857 50 9ms 8 Mar 2024 668th inventshah 857 79 2,798ms 25 Oct 2024 668th error256 857 79 2,726ms 26 Oct 2024 668th emgordon154 857 79 2,639ms 1 Nov 2024 671st 386asm 🇺🇸 857 175 43ms 4 May 2023 672nd Codsilla 🇨🇦 856 44 489ms 3 Nov 2023 672nd Daniel-Ellison 856 44 360ms 10 Aug 2025 672nd Lv0Sys 🇵🇱 856 44 278ms 6 Dec 2025 675th MeWhenI 🇻🇦 856 59 48ms 13 Feb 2025 675th DialFrost 🇸🇬 856 59 42ms 13 Feb 2025 675th Shanethegamer 🇺🇸 856 59 39ms 13 Feb 2025 675th pardouin 🇫🇷 856 59 43ms 20 Mar 2025 679th sean-niemann 🇺🇸 856 218 10ms 17 Dec 2025 680th MeWhenI 🇻🇦 855 23 40ms 25 Jul 2022 680th AlephSquirrel 855 23 42ms 31 Dec 2022 682nd primo-ppcg 🇹🇭 855 129 40ms 14 Jan 2025 683rd Natanaelel 🇸🇪 854 58 1,326ms 3 Jan 2024 684th GolfingSuccess 🇬🇷 854 62 6ms 9 Feb 2026 685th arcpolaris 854 85 415ms 16 Dec 2024 686th primo-ppcg 🇹🇭 854 218 5ms 6 Aug 2023 687th albanian-laundromat 854 300 26ms 18 days ago 688th KatieLG 🇬🇧 853 36 37ms 10 Apr 2022 688th SirBogman 🇺🇸 853 36 37ms 17 May 2022 688th Babafaba 853 36 36ms 15 Oct 2025 688th JOrE20 853 36 35ms 11 Feb 2026 692nd MeWhenI 🇻🇦 853 73 488ms 28 Feb 2022 692nd Shanethegamer 🇺🇸 853 73 487ms 23 Mar 2022 692nd DialFrost 🇸🇬 853 73 504ms 26 Oct 2023 692nd jipsong 🇩🇪 853 73 476ms 1 Jul 2024 692nd emgordon154 853 73 513ms 25 May 2025 697th JayXon 🇺🇸 853 141 154ms 4 Apr 2025 698th ovs-code 🇩🇪 853 180 10ms 15 Jul 2023 699th FlyingPenguin223 850 20 2ms 17 Oct 2024 700th Natanaelel 🇸🇪 850 46 30ms 3 Jan 2024 701st j-Ewan 850 138 278ms 10 Mar 2022 702nd Shanethegamer 🇺🇸 849 72 119ms 22 May 2025 702nd blaztoma 🇱🇹 849 72 112ms 28 Nov 2025 704th sean-niemann 🇺🇸 849 194 11ms 17 Dec 2025 705th canissimia 🇦🇶 848 135 3ms 30 Jan 2022 705th btnlq 848 135 4ms 17 Nov 2022 707th dokutan 847 68 7ms 26 Feb 2026 708th duckyluuk 🇳🇱 847 215 20ms 29 Nov 2025 709th Shanethegamer 🇺🇸 846 48 75ms 11 Mar 2023 710th voytxt 🇨🇿 846 51 130ms 3 Aug 2024 711th SirBogman 🇺🇸 845 36 248ms 17 May 2022 712th DialFrost 🇸🇬 845 53 10ms 24 Mar 2025 713th GrayJoKing 🇦🇺 845 164 8ms 8 Apr 2022 714th annaproxy 844 86 385ms 5 May 2022 715th JRaspass 🇬🇧 844 139 311ms 7 Feb 2024 715th Shanethegamer 🇺🇸 844 139 302ms 7 Feb 2024 715th DialFrost 🇸🇬 844 139 290ms 7 Feb 2024 718th fuzzylojik-golf 🇺🇸 843 75 103ms 8 Sep 2025 718th sean-niemann 🇺🇸 843 75 116ms 21 Sep 2025 720th JOrE20 843 304 26ms 11 Feb 2026 First Prev 641–720 of 2,065 Next Last