The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 801st AkashTandon167 737 73 17ms 28 Dec 2020 801st NewDefectus 🇮🇱 737 73 10ms 28 Dec 2020 801st TobyBoyne 🇬🇧 737 73 16ms 30 Dec 2020 801st NanduBC 737 73 24ms 23 Mar 2021 801st face0xff 737 73 17ms 20 Oct 2021 801st RDShah 737 73 9ms 15 May 2022 801st StefanHabel 🇨🇦 737 73 10ms 31 Dec 2022 801st betaveros 737 73 18ms 31 Dec 2022 801st mstang107 737 73 17ms 20 Dec 2023 801st Andrey135296 737 73 11ms 17 Sep 2024 801st lhulinsky 737 73 11ms 22 Oct 2024 801st moustave 737 73 17ms 10 Dec 2024 801st Matter1024 🇮🇳 737 73 19ms 8 hours ago 814th Shanethegamer 🇺🇸 737 102 42ms 7 Sep 2024 815th inventshah 736 85 3ms 11 Sep 2022 816th DialFrost 🇸🇬 734 89 39ms 20 Dec 2024 817th LiquidPulsar 734 116 153ms 24 Jan 2023 818th janbehrens 🇩🇪 734 125 26ms 9 Jul 2021 819th MeWhenI 🇻🇦 732 64 138ms 25 Oct 2024 820th MeWhenI 🇻🇦 732 88 127ms 15 Nov 2022 821st MeWhenI 🇻🇦 730 49 3ms 16 Apr 2023 821st janbehrens 🇩🇪 730 49 3ms 5 Jan 2024 821st tungstengmd 730 49 3ms 18 Feb 2026 824th KatieLG 🇬🇧 730 91 100ms 15 Jan 2023 825th CaedenHarper 🇨🇦 730 141 287ms 10 Nov 2025 826th Natanaelel 🇸🇪 727 60 1,288ms 17 Jun 2021 827th qrico64 727 74 10ms 2 Feb 2021 827th bastienvoirin 🇫🇷 727 74 10ms 10 May 2021 827th mauro-1 🇮🇹 727 74 10ms 17 Aug 2021 827th petar-donchev 727 74 17ms 5 Dec 2021 827th knutae 🇳🇴 727 74 10ms 6 Dec 2021 827th clementblaudeau 727 74 18ms 27 Jan 2022 827th j-Ewan 727 74 17ms 1 Mar 2022 827th guilhem-roy 🇫🇷 727 74 16ms 3 Mar 2022 827th Trunksistor 🇫🇷 727 74 18ms 19 May 2022 827th nstearns96 🇬🇧 727 74 19ms 12 Dec 2022 827th vishwathg 727 74 11ms 7 Apr 2023 827th dranjohn 727 74 10ms 11 Sep 2023 827th rollershutter 727 74 16ms 23 Oct 2023 827th starfihs 727 74 28ms 5 Aug 2024 827th BREMAUCY 🇫🇷 727 74 10ms 12 Aug 2025 827th wobblybits 727 74 9ms 23 Aug 2025 827th michelebastione 🇮🇹 727 74 10ms 3 Nov 2025 827th TheSecondComing123 727 74 10ms 5 Feb 2026 845th btjones0 727 117 161ms 9 Jan 2021 846th albanian-laundromat 727 224 11ms 5 Dec 2025 847th duckyluuk 🇳🇱 726 73 8ms 7 Nov 2025 848th DialFrost 🇸🇬 726 81 10ms 16 Aug 2024 848th emgordon154 726 81 8ms 29 Aug 2024 850th KatieLG 🇬🇧 726 113 362ms 13 Oct 2022 851st yzhs 🇩🇪 725 56 32ms 20 Jul 2022 852nd janbehrens 🇩🇪 723 69 365ms 10 Nov 2021 853rd strout 723 95 123ms 15 Aug 2022 854th BlankSpruce 723 116 67ms 18 Sep 2024 855th CheeseCake628 🇳🇴 721 71 480ms 18 Oct 2025 856th luuumine 🇫🇷 721 118 149ms 13 Nov 2025 857th lifthrasiir 🇰🇷 719 40 2ms 27 Nov 2024 858th zbreit 🇺🇸 718 75 10ms 20 Aug 2021 858th itsjustfreekie 718 75 11ms 22 Sep 2021 858th amollberg 🇸🇪 718 75 10ms 27 Jan 2022 858th NerdyMcNerd42 718 75 9ms 13 Aug 2022 858th MaxElf999 718 75 16ms 3 Oct 2022 858th LeeCamp 718 75 10ms 13 Jan 2023 858th hiichbindermax 718 75 11ms 17 Feb 2023 858th mbittner20 718 75 10ms 27 May 2023 858th ImpressedByRocks 718 75 17ms 17 May 2024 858th Bulmenisaurus 718 75 10ms 4 Nov 2024 858th bltnppcnt 718 75 19ms 5 Jan 2025 858th 40fied4t 718 75 11ms 22 May 2025 858th Andrey2001 718 75 17ms 9 Dec 2025 871st MeWhenI 🇻🇦 717 57 4ms 17 Nov 2023 872nd MeWhenI 🇻🇦 716 95 2,718ms 24 Oct 2024 873rd rak1507 🇬🇧 716 96 122ms 21 Jan 2021 873rd scpchicken 🇵🇼 716 96 119ms 23 Mar 2022 875th luuumine 🇫🇷 714 89 2ms 1 Dec 2025 876th varhammer 714 110 6ms 13 Dec 2023 877th lynn 713 44 35ms 4 Apr 2021 878th JDiLenarda 🇫🇷 713 115 363ms 29 Nov 2023 879th hiddicop 🇸🇪 712 57 42ms 30 Jan 2021 879th aydamak 712 57 37ms 17 May 2024 First Prev 801–880 of 2,045 Next Last
