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 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 561st Lydxn 🇨🇦 808 40 8ms 24 Jun 2023 562nd edsrzf 🇳🇿 807 75 5ms 10 Nov 2025 563rd stefangimmillaro 807 82 2,512ms 7 Nov 2024 564th pandapawskat 806 73 2ms 6 Dec 2022 564th elgan65536 🇺🇸 806 73 2ms 5 Mar 2024 564th blaztoma 🇱🇹 806 73 2ms 16 Aug 2025 564th Emutis 🇱🇹 806 73 2ms 16 Aug 2025 568th snyderek 🇺🇸 806 77 2ms 19 Jan 2025 569th marshallward 🇺🇸 805 82 39ms 20 Jun 2023 570th luuumine 🇫🇷 805 107 126ms 17 Nov 2025 571st CaedenHarper 🇨🇦 805 118 299ms 4 Nov 2025 572nd janlelis 803 45 44ms 8 Dec 2023 572nd DialFrost 🇸🇬 803 45 42ms 2 Aug 2024 572nd snoozingnewt 🇨🇦 803 45 45ms 10 Oct 2025 572nd emgordon154 803 45 40ms 17 Nov 2025 576th Shanethegamer 🇺🇸 803 50 1ms 19 Nov 2022 576th MeWhenI 🇻🇦 803 50 6ms 29 May 2023 578th mrnomm 803 65 15ms 6 Apr 2023 578th suwat513 803 65 37ms 19 Jun 2023 578th 2011-Chan-Ethan 803 65 39ms 10 Jul 2023 578th neihousaigaai 803 65 16ms 13 Feb 2024 578th Stockoh 🇫🇷 803 65 40ms 26 Apr 2024 578th CLOStrophobic 🇮🇹 803 65 11ms 31 Jan 2025 578th TheZwierzLF 🇵🇱 803 65 34ms 27 May 2025 578th Bmrl7 803 65 15ms 23 Dec 2025 586th rucin93 🇵🇱 802 53 137ms 6 Dec 2024 587th ovs-code 🇩🇪 801 39 312ms 30 Dec 2023 588th SirBogman 🇺🇸 800 25 77ms 22 Nov 2022 589th emgordon154 799 48 1,329ms 18 Nov 2024 590th RedzGoose 🇦🇺 799 62 414ms 10 Sep 2024 590th alemelis 799 62 2,097ms 20 Sep 2024 590th albanian-laundromat 799 62 416ms 4 Aug 2025 593rd MeWhenI 🇻🇦 799 69 140ms 24 Nov 2022 594th MeWhenI 🇻🇦 798 108 135ms 22 Jul 2024 595th blaztoma 🇱🇹 798 119 288ms 16 Aug 2025 596th Shanethegamer 🇺🇸 797 62 12ms 19 Nov 2022 596th jared-hughes 797 62 11ms 16 Mar 2023 596th raphaelimahorn 797 62 12ms 24 Mar 2023 596th Maznek 797 62 11ms 28 Jun 2023 596th unfinishedprogram 797 62 13ms 5 Jul 2023 601st Shanethegamer 🇺🇸 797 83 2,692ms 28 Oct 2024 602nd DialFrost 🇸🇬 796 47 13ms 25 Sep 2024 603rd blaztoma 🇱🇹 796 96 61ms 17 Aug 2025 604th prestosilver 🇺🇸 795 83 124ms 31 Dec 2025 605th GolfingSuccess 🇬🇷 792 111 37ms 6 days ago 606th mdnestor 791 66 41ms 23 Dec 2022 606th jared-hughes 791 66 11ms 16 Mar 2023 606th fgrosshans 🇫🇷 791 66 44ms 14 Jul 2024 606th codingisgreatbutiamnot 791 66 40ms 9 Aug 2024 606th hellwue 791 66 44ms 4 Sep 2024 606th iczelia 🇩🇪 791 66 32ms 23 Oct 2025 606th Europe2048 791 66 15ms 12 days ago 613th bac0id 791 95 398ms 30 Jun 2024 614th albanian-laundromat 791 177 1,477ms 15 Oct 2025 615th emplv 🇱🇻 790 82 117ms 25 Nov 2022 615th tobeannouncd 790 82 169ms 21 May 2024 617th 09cf 790 109 136ms 26 Sep 2023 618th rucin93 🇵🇱 789 70 16ms 26 Jul 2025 619th Natanaelel 🇸🇪 788 41 7ms 30 Dec 2022 619th o0lit3 🇺🇸 788 41 7ms 20 Jun 2023 621st MeWhenI 🇻🇦 786 46 42ms 24 Nov 2022 621st m-tkach 🇺🇦 786 46 38ms 31 Aug 2023 623rd 09cf 785 33 5ms 5 Sep 2023 623rd mousetail 🇳🇱 785 33 4ms 15 Mar 2024 623rd MeWhenI 🇻🇦 785 33 4ms 17 Feb 2025 626th Natanaelel 🇸🇪 784 63 12ms 21 Jul 2023 627th bac0id 784 75 2ms 27 Sep 2023 628th Shanethegamer 🇺🇸 784 120 27ms 27 Dec 2022 629th albanian-laundromat 783 56 1,170ms 22 Sep 2025 630th Andriamanitra 🇫🇮 782 49 1,314ms 18 Oct 2023 631st msbranicky 782 178 1,674ms 16 Sep 2025 632nd Alessandro-Balconi 🇮🇹 780 63 84ms 12 Jul 2023 633rd Irratix 🇳🇱 780 98 62ms 3 Aug 2023 633rd Emutis 🇱🇹 780 98 64ms 15 Aug 2025 635th vishwathg 779 67 29ms 4 Feb 2023 635th jamesthekee 779 67 14ms 25 Jan 2025 637th MeWhenI 🇻🇦 778 85 2,708ms 24 Oct 2024 638th albanian-laundromat 777 80 40ms 2 Sep 2025 639th Shanethegamer 🇺🇸 776 80 2ms 19 Nov 2022 639th frosster 🇨🇦 776 80 2ms 8 Feb 2026 First Prev 561–640 of 1,680 Next Last