The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 877th snoozingnewt 🇨🇦 712 57 36ms 14 Oct 2025 882nd kmathis22 712 121 461ms 23 Oct 2025 883rd alomiF 709 97 149ms 23 Aug 2024 884th verticallity 709 120 149ms 8 Apr 2022 885th error256 708 73 66ms 13 Sep 2024 886th tomh1012 708 76 10ms 3 Mar 2021 886th gilufin 708 76 11ms 23 Jun 2021 886th Mikey-Beep 🇬🇧 708 76 10ms 6 Oct 2022 886th DrPiranoid 708 76 10ms 7 Oct 2022 886th Troon 708 76 26ms 14 Oct 2022 886th ssbhatt4321 708 76 16ms 14 Oct 2023 886th m42km 708 76 16ms 17 Jan 2024 886th Schreipfelerer 708 76 10ms 26 Sep 2024 894th snoozingnewt 🇨🇦 707 94 81ms 8 Oct 2025 895th edsrzf 🇳🇿 706 83 4ms 2 Nov 2024 896th KrausRaus 🇺🇸 705 70 9ms 10 Jan 2021 896th Re-Adventures 🇮🇳 705 70 13ms 12 Mar 2021 898th rboath 704 69 77ms 8 Jan 2025 899th edsrzf 🇳🇿 703 92 3ms 12 Nov 2025 900th MeWhenI 🇻🇦 703 97 1,021ms 3 Nov 2023 901st elgan65536 🇺🇸 703 121 148ms 7 Feb 2026 902nd rvdnieuwendijk 🇳🇱 702 60 260ms 28 Dec 2020 902nd janbehrens 🇩🇪 702 60 268ms 29 Sep 2021 904th Natanaelel 🇸🇪 701 41 2ms 20 Jul 2023 904th emgordon154 701 41 4ms 7 Oct 2025 906th iczelia 🇩🇪 701 88 2ms 15 Oct 2025 907th Artemis21 🇬🇧 701 98 121ms 21 Dec 2024 908th tatzyr 🇯🇵 700 58 37ms 26 Mar 2025 909th MeWhenI 🇻🇦 699 64 920ms 15 Sep 2025 910th fynnkroeger 699 77 10ms 10 Jan 2021 910th asadullayev 699 77 11ms 4 Mar 2021 910th PYRiTEmonark 699 77 10ms 22 May 2021 910th RandGuy 699 77 9ms 4 May 2022 910th ValentinCassayre 699 77 10ms 10 Oct 2022 910th IshanPanpaliya 699 77 10ms 19 Oct 2022 910th dzshn 699 77 10ms 3 Dec 2022 910th KenanHanke 699 77 10ms 25 Feb 2023 910th namelessiw 699 77 30ms 11 Jan 2024 910th NickTheEASDude 🇺🇸 699 77 16ms 1 May 2024 920th Alex-x90 🇺🇸 698 91 2ms 15 Feb 2023 921st lynn 697 122 149ms 1 Apr 2022 922nd Attero 🇸🇪 695 71 10ms 7 Feb 2021 922nd c0d3-4-F00d 🇩🇪 695 71 10ms 6 Jun 2021 922nd olivermrose 🇺🇸 695 71 9ms 28 Aug 2021 922nd Giga-Bowser 695 71 10ms 5 Jan 2022 922nd tomh1012 695 71 9ms 21 Nov 2025 922nd Program-Pi 695 71 15ms 25 days ago 928th lynn 695 98 1,023ms 8 Sep 2021 929th HumanEquivalentUnit 695 118 360ms 26 Nov 2023 929th Mikey-Beep 🇬🇧 695 118 385ms 2 Sep 2024 929th dokutan 695 118 362ms 7 Jun 2025 932nd Yewzir 🇧🇪 695 197 1,846ms 14 Nov 2025 933rd vgamula 🇺🇦 693 128 29ms 17 Jan 2024 934th GolfingSuccess 🇬🇷 692 39 42ms 22 Jul 2022 935th Andrey2001 692 74 425ms 28 Jan 2026 936th Shanethegamer 🇺🇸 692 85 6ms 15 Aug 2024 937th azure-blondon 692 123 144ms 2 Dec 2025 938th charlieharutaka 691 98 14ms 16 Nov 2021 939th richard-oelze 🇩🇪 690 78 17ms 13 May 2021 939th Kloppermand 🇩🇰 690 78 17ms 29 Nov 2021 939th Omega65536 🇩🇪 690 78 9ms 24 Nov 2022 939th Fanrco 690 78 11ms 4 Sep 2023 939th Techdude01 690 78 10ms 11 Jan 2024 939th Mabeloid 🇳🇴 690 78 10ms 3 Oct 2024 939th Alban-Boissard 690 78 11ms 14 Jun 2025 946th kg583 🇺🇸 690 85 6ms 5 Oct 2025 947th cure-honey 🇯🇵 690 133 24ms 10 Jul 2021 948th dokutan 689 68 135ms 15 Jun 2025 949th annaproxy 688 59 35ms 27 Aug 2022 949th Lv0Sys 🇵🇱 688 59 37ms 4 Dec 2025 951st MeWhenI 🇻🇦 688 95 39ms 9 May 2023 952nd hymanimy 687 100 155ms 19 Aug 2021 952nd Andriamanitra 🇫🇮 687 100 116ms 28 Feb 2025 954th MeWhenI 🇻🇦 687 237 11ms 19 Apr 2025 955th ereztaiar 🇮🇱 686 72 10ms 7 Sep 2021 955th Yax42 🇫🇷 686 72 12ms 5 Sep 2025 957th MeWhenI 🇻🇦 686 121 1,310ms 14 Jun 2023 958th emgordon154 686 124 161ms 27 Feb 2025 959th cure-honey 🇯🇵 685 97 92ms 4 Jul 2021 960th razetime 684 42 2ms 2 Oct 2022 First Prev 881–960 of 2,040 Next Last