The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Recamán 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 721st Shanethegamer 🇺🇸 762 182 1,419ms 28 Mar 2025 722nd stefangimmillaro 761 85 118ms 3 Oct 2023 723rd Mikey-Beep 🇬🇧 761 89 16ms 5 Sep 2023 724th Shanethegamer 🇺🇸 761 95 13ms 28 Dec 2023 725th CaedenHarper 🇨🇦 760 65 11ms 6 Sep 2025 726th CaedenHarper 🇨🇦 759 108 361ms 20 Oct 2025 727th MeWhenI 🇻🇦 759 131 5ms 26 Aug 2023 728th andre-lameirinhas 🇵🇹 758 71 10ms 12 Jan 2021 728th Attero 🇸🇪 758 71 19ms 23 Jan 2021 728th ydevor 🇮🇱 758 71 17ms 18 Feb 2021 728th Indivicivet 758 71 17ms 26 Oct 2021 728th LiquidPulsar 758 71 11ms 29 Nov 2021 728th CedricGebistorf 758 71 10ms 11 Feb 2022 728th MichalMarsalek 🇨🇿 758 71 10ms 16 Mar 2022 728th Tess2662 758 71 10ms 28 Aug 2022 728th TaserTheFox 🇺🇸 758 71 25ms 25 May 2023 728th AlexanderFair 758 71 10ms 1 Jul 2023 728th quimey 758 71 10ms 28 Jul 2023 728th yourlefthandman 758 71 10ms 17 Aug 2023 728th FortuiteMan 🇫🇷 758 71 10ms 26 Aug 2023 728th PrathamMehta08 758 71 19ms 6 Dec 2023 728th jatloe 758 71 17ms 28 Jan 2024 728th mathisfun271 758 71 10ms 5 Feb 2024 728th jmfk 758 71 17ms 12 Apr 2024 728th aalec 758 71 18ms 4 May 2024 728th ahmetdemirag 🇨🇾 758 71 10ms 14 Jun 2024 728th azure-blondon 758 71 10ms 16 Jun 2024 728th CutSandstone 758 71 10ms 19 Jul 2024 728th CommandLeo 🇮🇹 758 71 10ms 22 Dec 2025 728th 77Tigers 758 71 16ms 9 Jan 2026 728th FoxInTheClouds 758 71 16ms 5 Feb 2026 752nd MeWhenI 🇻🇦 758 183 1,411ms 28 Mar 2025 753rd emgordon154 756 62 141ms 5 Jan 2025 754th edsrzf 🇳🇿 755 104 6ms 28 Sep 2024 755th Alex-x90 🇺🇸 755 111 61ms 11 May 2024 756th m-tkach 🇺🇦 754 83 2ms 26 Oct 2022 757th SirBogman 🇺🇸 752 44 133ms 3 May 2021 758th OhmNomNom 752 54 35ms 16 Oct 2022 759th yzhs 🇩🇪 752 58 1,269ms 3 Aug 2021 760th lynn 750 36 42ms 22 Jul 2022 760th SirBogman 🇺🇸 750 36 41ms 12 Sep 2022 760th emgordon154 750 36 40ms 10 Sep 2024 763rd DialFrost 🇸🇬 750 185 1,412ms 20 Jan 2025 764th edsrzf 🇳🇿 749 62 5ms 28 Sep 2024 765th aaronze 🇦🇺 748 66 10ms 27 Apr 2021 765th alasdair-greenland 748 66 10ms 28 Oct 2021 765th aksyristos 748 66 10ms 30 Dec 2022 768th jacklynnepenick 748 72 17ms 26 Aug 2021 768th hellwue 748 72 10ms 25 Feb 2022 768th nullie 748 72 9ms 14 Jun 2022 768th CheeseCake628 🇳🇴 748 72 10ms 6 Mar 2023 768th fourth-bit 748 72 16ms 3 Jul 2023 768th jipsong 🇩🇪 748 72 10ms 23 Jul 2024 768th Terobero 748 72 18ms 21 Aug 2024 768th edsrzf 🇳🇿 748 72 18ms 28 Sep 2024 768th jamesthekee 748 72 10ms 26 Jan 2025 768th dirckvdende 748 72 11ms 20 Jul 2025 768th Alex-Huggett 🇬🇧 748 72 11ms 14 Sep 2025 768th Emutis 🇱🇹 748 72 10ms 24 days ago 780th sean-niemann 🇺🇸 747 92 122ms 1 Jul 2023 780th TrueBoxGuy 747 92 120ms 17 Jul 2024 780th iczelia 🇩🇪 747 92 117ms 19 Oct 2025 783rd HumanoidCPU 746 89 90ms 23 Dec 2025 784th kurkale6ka 745 48 3ms 18 May 2021 785th MeWhenI 🇻🇦 745 97 7ms 9 May 2024 786th edsrzf 🇳🇿 745 107 6ms 15 days ago 787th postie77 745 110 401ms 8 Sep 2023 788th Bubbler-4 744 96 4ms 14 Jul 2023 789th jared-hughes 743 55 4ms 6 Oct 2022 790th commandz0 🇺🇸 742 69 446ms 1 Sep 2025 790th TheZwierzLF 🇵🇱 742 69 449ms 24 Nov 2025 792nd Shanethegamer 🇺🇸 742 79 4ms 22 Apr 2023 793rd TimCurwick 🇺🇸 739 57 276ms 26 Jan 2021 794th Kacarott 🇦🇺 739 70 67ms 13 Sep 2024 795th stefangimmillaro 739 92 2,520ms 10 Nov 2024 796th Shanethegamer 🇺🇸 739 120 29ms 27 Dec 2022 797th anter69 🇭🇺 738 55 49ms 25 Jan 2023 798th Dazza314 🇬🇧 737 67 11ms 15 Apr 2021 798th zakariamouhid 737 67 10ms 21 Jun 2023 800th AkashTandon167 737 73 17ms 28 Dec 2020 First Prev 721–800 of 2,041 Next Last