The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 800th NewDefectus 🇮🇱 737 73 10ms 28 Dec 2020 800th TobyBoyne 🇬🇧 737 73 16ms 30 Dec 2020 800th NanduBC 737 73 24ms 23 Mar 2021 800th face0xff 737 73 17ms 20 Oct 2021 800th RDShah 737 73 9ms 15 May 2022 800th StefanHabel 🇨🇦 737 73 10ms 31 Dec 2022 800th betaveros 737 73 18ms 31 Dec 2022 800th mstang107 737 73 17ms 20 Dec 2023 800th Andrey135296 737 73 11ms 17 Sep 2024 800th lhulinsky 737 73 11ms 22 Oct 2024 800th moustave 737 73 17ms 10 Dec 2024 800th Googolplexo 🇷🇺 737 73 10ms 54 mins ago 813th Shanethegamer 🇺🇸 737 102 42ms 7 Sep 2024 814th inventshah 736 85 3ms 11 Sep 2022 815th DialFrost 🇸🇬 734 89 39ms 20 Dec 2024 816th LiquidPulsar 734 116 153ms 24 Jan 2023 817th janbehrens 🇩🇪 734 125 26ms 9 Jul 2021 818th MeWhenI 🇻🇦 732 64 138ms 25 Oct 2024 819th MeWhenI 🇻🇦 732 88 127ms 15 Nov 2022 820th MeWhenI 🇻🇦 730 49 3ms 16 Apr 2023 820th janbehrens 🇩🇪 730 49 3ms 5 Jan 2024 820th tungstengmd 730 49 3ms 18 Feb 2026 823rd KatieLG 🇬🇧 730 91 100ms 15 Jan 2023 824th CaedenHarper 🇨🇦 730 141 287ms 10 Nov 2025 825th Natanaelel 🇸🇪 727 60 1,288ms 17 Jun 2021 826th qrico64 727 74 10ms 2 Feb 2021 826th bastienvoirin 🇫🇷 727 74 10ms 10 May 2021 826th mauro-1 🇮🇹 727 74 10ms 17 Aug 2021 826th petar-donchev 727 74 17ms 5 Dec 2021 826th knutae 🇳🇴 727 74 10ms 6 Dec 2021 826th clementblaudeau 727 74 18ms 27 Jan 2022 826th j-Ewan 727 74 17ms 1 Mar 2022 826th guilhem-roy 🇫🇷 727 74 16ms 3 Mar 2022 826th Trunksistor 🇫🇷 727 74 18ms 19 May 2022 826th nstearns96 🇬🇧 727 74 19ms 12 Dec 2022 826th vishwathg 727 74 11ms 7 Apr 2023 826th dranjohn 727 74 10ms 11 Sep 2023 826th rollershutter 727 74 16ms 23 Oct 2023 826th starfihs 727 74 28ms 5 Aug 2024 826th BREMAUCY 🇫🇷 727 74 10ms 12 Aug 2025 826th wobblybits 727 74 9ms 23 Aug 2025 826th michelebastione 🇮🇹 727 74 10ms 3 Nov 2025 826th TheSecondComing123 727 74 10ms 5 Feb 2026 844th btjones0 727 117 161ms 9 Jan 2021 845th albanian-laundromat 727 224 11ms 5 Dec 2025 846th duckyluuk 🇳🇱 726 73 8ms 7 Nov 2025 847th DialFrost 🇸🇬 726 81 10ms 16 Aug 2024 847th emgordon154 726 81 8ms 29 Aug 2024 849th KatieLG 🇬🇧 726 113 362ms 13 Oct 2022 850th yzhs 🇩🇪 725 56 32ms 20 Jul 2022 851st janbehrens 🇩🇪 723 69 365ms 10 Nov 2021 852nd strout 723 95 123ms 15 Aug 2022 853rd BlankSpruce 723 116 67ms 18 Sep 2024 854th CheeseCake628 🇳🇴 721 71 480ms 18 Oct 2025 855th luuumine 🇫🇷 721 118 149ms 13 Nov 2025 856th lifthrasiir 🇰🇷 719 40 2ms 27 Nov 2024 857th zbreit 🇺🇸 718 75 10ms 20 Aug 2021 857th itsjustfreekie 718 75 11ms 22 Sep 2021 857th amollberg 🇸🇪 718 75 10ms 27 Jan 2022 857th NerdyMcNerd42 718 75 9ms 13 Aug 2022 857th MaxElf999 718 75 16ms 3 Oct 2022 857th LeeCamp 718 75 10ms 13 Jan 2023 857th hiichbindermax 718 75 11ms 17 Feb 2023 857th mbittner20 718 75 10ms 27 May 2023 857th ImpressedByRocks 718 75 17ms 17 May 2024 857th Bulmenisaurus 718 75 10ms 4 Nov 2024 857th bltnppcnt 718 75 19ms 5 Jan 2025 857th 40fied4t 718 75 11ms 22 May 2025 857th Andrey2001 718 75 17ms 9 Dec 2025 870th MeWhenI 🇻🇦 717 57 4ms 17 Nov 2023 871st MeWhenI 🇻🇦 716 95 2,718ms 24 Oct 2024 872nd rak1507 🇬🇧 716 96 122ms 21 Jan 2021 872nd scpchicken 🇵🇼 716 96 119ms 23 Mar 2022 874th luuumine 🇫🇷 714 89 2ms 1 Dec 2025 875th varhammer 714 110 6ms 13 Dec 2023 876th lynn 713 44 35ms 4 Apr 2021 877th JDiLenarda 🇫🇷 713 115 363ms 29 Nov 2023 878th hiddicop 🇸🇪 712 57 42ms 30 Jan 2021 878th aydamak 712 57 37ms 17 May 2024 878th KatieLG 🇬🇧 712 57 37ms 2 Oct 2025 First Prev 801–880 of 2,042 Next Last
