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 879th KatieLG 🇬🇧 712 57 37ms 2 Oct 2025 879th blaztoma 🇱🇹 712 57 36ms 12 Oct 2025 879th snoozingnewt 🇨🇦 712 57 36ms 14 Oct 2025 884th kmathis22 712 121 461ms 23 Oct 2025 885th alomiF 709 97 149ms 23 Aug 2024 886th verticallity 709 120 156ms 8 Apr 2022 887th error256 708 73 66ms 13 Sep 2024 888th tomh1012 708 76 10ms 3 Mar 2021 888th gilufin 708 76 11ms 23 Jun 2021 888th Mikey-Beep 🇬🇧 708 76 10ms 6 Oct 2022 888th DrPiranoid 708 76 10ms 7 Oct 2022 888th Troon 708 76 26ms 14 Oct 2022 888th ssbhatt4321 708 76 16ms 14 Oct 2023 888th m42km 708 76 16ms 17 Jan 2024 888th Schreipfelerer 708 76 10ms 26 Sep 2024 896th snoozingnewt 🇨🇦 707 94 98ms 8 Oct 2025 897th edsrzf 🇳🇿 706 83 4ms 2 Nov 2024 898th KrausRaus 🇺🇸 705 70 10ms 10 Jan 2021 898th Re-Adventures 🇮🇳 705 70 10ms 12 Mar 2021 900th rboath 704 69 77ms 8 Jan 2025 901st edsrzf 🇳🇿 703 92 3ms 12 Nov 2025 902nd MeWhenI 🇻🇦 703 97 1,021ms 3 Nov 2023 903rd elgan65536 🇺🇸 703 121 160ms 7 Feb 2026 904th rvdnieuwendijk 🇳🇱 702 60 260ms 28 Dec 2020 904th janbehrens 🇩🇪 702 60 268ms 29 Sep 2021 906th Natanaelel 🇸🇪 701 41 2ms 20 Jul 2023 906th emgordon154 701 41 4ms 7 Oct 2025 908th iczelia 🇩🇪 701 88 2ms 15 Oct 2025 909th Artemis21 🇬🇧 701 98 121ms 21 Dec 2024 910th tatzyr 🇯🇵 700 58 37ms 26 Mar 2025 911th MeWhenI 🇻🇦 699 64 920ms 15 Sep 2025 912th fynnkroeger 699 77 10ms 10 Jan 2021 912th asadullayev 699 77 11ms 4 Mar 2021 912th PYRiTEmonark 699 77 10ms 22 May 2021 912th RandGuy 699 77 9ms 4 May 2022 912th ValentinCassayre 699 77 10ms 10 Oct 2022 912th IshanPanpaliya 699 77 10ms 19 Oct 2022 912th dzshn 699 77 10ms 3 Dec 2022 912th KenanHanke 699 77 10ms 25 Feb 2023 912th namelessiw 699 77 30ms 11 Jan 2024 912th NickTheEASDude 🇺🇸 699 77 16ms 1 May 2024 922nd Alex-x90 🇺🇸 698 91 2ms 15 Feb 2023 923rd lynn 697 122 170ms 1 Apr 2022 924th Attero 🇸🇪 695 71 10ms 7 Feb 2021 924th c0d3-4-F00d 🇩🇪 695 71 10ms 6 Jun 2021 924th olivermrose 🇺🇸 695 71 10ms 28 Aug 2021 924th Giga-Bowser 695 71 10ms 5 Jan 2022 924th tomh1012 695 71 11ms 21 Nov 2025 924th Program-Pi 695 71 10ms 26 Feb 2026 930th lynn 695 98 1,023ms 8 Sep 2021 931st HumanEquivalentUnit 695 118 360ms 26 Nov 2023 931st Mikey-Beep 🇬🇧 695 118 385ms 2 Sep 2024 931st dokutan 695 118 362ms 7 Jun 2025 934th Yewzir 🇧🇪 695 197 1,846ms 14 Nov 2025 935th vgamula 🇺🇦 693 128 29ms 17 Jan 2024 936th GolfingSuccess 🇬🇷 692 39 42ms 22 Jul 2022 937th Andrey2001 692 74 425ms 28 Jan 2026 938th Shanethegamer 🇺🇸 692 85 6ms 15 Aug 2024 939th azure-blondon 692 123 163ms 2 Dec 2025 940th charlieharutaka 691 98 14ms 16 Nov 2021 941st richard-oelze 🇩🇪 690 78 17ms 13 May 2021 941st Kloppermand 🇩🇰 690 78 17ms 29 Nov 2021 941st Omega65536 🇩🇪 690 78 9ms 24 Nov 2022 941st Fanrco 690 78 11ms 4 Sep 2023 941st Techdude01 690 78 10ms 11 Jan 2024 941st Mabeloid 🇳🇴 690 78 10ms 3 Oct 2024 941st Alban-Boissard 690 78 11ms 14 Jun 2025 948th kg583 🇺🇸 690 85 6ms 5 Oct 2025 949th cure-honey 🇯🇵 690 133 24ms 10 Jul 2021 950th dokutan 689 68 135ms 15 Jun 2025 951st annaproxy 688 59 35ms 27 Aug 2022 951st Lv0Sys 🇵🇱 688 59 37ms 4 Dec 2025 953rd MeWhenI 🇻🇦 688 95 39ms 9 May 2023 954th hymanimy 687 100 155ms 19 Aug 2021 954th Andriamanitra 🇫🇮 687 100 116ms 28 Feb 2025 956th MeWhenI 🇻🇦 687 237 11ms 19 Apr 2025 957th ereztaiar 🇮🇱 686 72 12ms 7 Sep 2021 957th Yax42 🇫🇷 686 72 11ms 5 Sep 2025 959th MeWhenI 🇻🇦 686 121 1,310ms 14 Jun 2023 960th emgordon154 686 124 153ms 27 Feb 2025 First Prev 881–960 of 2,045 Next Last