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 481st prplz 🇦🇺 846 48 34ms 27 Dec 2020 481st Natanaelel 🇸🇪 846 48 35ms 28 Feb 2023 481st pardouin 🇫🇷 846 48 39ms 9 Aug 2025 484th bstrat 845 34 2ms 28 Aug 2024 485th frosster 🇨🇦 845 73 2ms 1 Feb 2026 486th edsrzf 🇳🇿 845 89 41ms 15 Apr 2025 487th AlephSquirrel 844 32 43ms 30 Dec 2022 487th ovs-code 🇩🇪 844 32 42ms 27 Jul 2024 489th DialFrost 🇸🇬 844 55 4ms 7 Jul 2024 490th emplv 🇱🇻 844 122 288ms 18 Jan 2022 490th stefangimmillaro 844 122 290ms 18 Sep 2023 492nd GolfingSuccess 🇬🇷 843 123 36ms 4 hours ago 493rd schachmattmatt 841 64 10ms 20 Aug 2021 493rd olivermrose 🇺🇸 841 64 16ms 28 Aug 2021 493rd tkr-sh 🇰🇵 841 64 15ms 25 Apr 2022 493rd P-Quentin 🇫🇷 841 64 26ms 3 Aug 2022 493rd suwat513 841 64 15ms 22 Sep 2022 493rd InigoK 🇺🇸 841 64 10ms 10 Jun 2023 493rd levavft 841 64 11ms 26 Oct 2023 493rd firegene 🇮🇪 841 64 16ms 24 Dec 2023 493rd JunkIce 841 64 16ms 3 Dec 2024 493rd dokutan 841 64 16ms 15 Jun 2025 503rd stefangimmillaro 839 52 1,274ms 6 May 2023 504th GrayJoKing 🇦🇺 839 61 462ms 16 Jan 2024 504th sisyphus-ppcg 🇦🇺 839 61 545ms 16 Jan 2024 504th m-tkach 🇺🇦 839 61 467ms 20 Jan 2024 504th CaedenHarper 🇨🇦 839 61 436ms 7 Feb 2025 508th Yewzir 🇧🇪 838 68 2ms 14 Oct 2023 509th DialFrost 🇸🇬 838 82 119ms 8 Aug 2024 510th Maznek 837 59 9ms 27 Dec 2023 511th sean-niemann 🇺🇸 835 75 2ms 18 Jan 2025 512th DialFrost 🇸🇬 834 49 3ms 30 Oct 2024 513th MeWhenI 🇻🇦 833 74 2ms 31 Dec 2022 514th bbakersmith 831 82 46ms 1 Aug 2021 515th argusdusty 🇺🇸 830 124 293ms 27 Dec 2020 515th Shanethegamer 🇺🇸 830 124 280ms 7 Apr 2022 517th sean-niemann 🇺🇸 829 54 962ms 6 Dec 2025 517th Steffan153 🇫🇮 829 54 710ms 13 Feb 2026 519th janbehrens 🇩🇪 829 56 5ms 8 Jun 2021 520th DialFrost 🇸🇬 829 82 2,675ms 25 Oct 2024 521st SirBogman 🇺🇸 828 49 35ms 28 Dec 2020 521st gilufin 828 49 36ms 8 Aug 2021 521st m-tkach 🇺🇦 828 49 36ms 14 Feb 2023 521st olleicua 🇺🇸 828 49 35ms 20 Jan 2024 525th rowboat1 828 65 25ms 21 Jun 2022 525th jsthope 828 65 10ms 28 Sep 2022 525th QuincyNash 🇺🇸 828 65 11ms 29 Nov 2022 525th Yewzir 🇧🇪 828 65 27ms 14 Apr 2023 529th alicethecatwhisperermeow 828 99 395ms 7 Aug 2024 530th DialFrost 🇸🇬 827 95 8ms 12 Dec 2024 531st lynn 826 82 12ms 16 Nov 2021 532nd AlephSquirrel 825 62 404ms 26 Jun 2024 532nd KatieLG 🇬🇧 825 62 441ms 28 Oct 2024 534th xkacer 🇨🇿 825 77 1ms 7 Feb 2021 534th iczelia 🇩🇪 825 77 2ms 16 Jan 2026 534th FoxInTheClouds 825 77 2ms 5 Feb 2026 537th DialFrost 🇸🇬 823 53 1,336ms 20 Jul 2024 538th Steffan153 🇫🇮 823 59 90ms 14 Dec 2022 539th coreynash 823 60 9ms 14 Feb 2024 539th penbuvt 823 60 10ms 7 Nov 2024 541st Salutations45 822 53 2ms 11 Dec 2024 542nd rak1507 🇬🇧 821 35 2ms 10 Jan 2022 542nd SirBogman 🇺🇸 821 35 2ms 17 Nov 2023 544th tigerdan2 🇩🇪 820 105 466ms 30 Nov 2025 545th DialFrost 🇸🇬 819 79 122ms 13 Jul 2024 546th Shanethegamer 🇺🇸 818 98 466ms 1 Mar 2022 547th Steffan153 🇫🇮 817 61 429ms 1 Jan 2023 548th kkoenig 817 126 287ms 3 Jan 2024 548th KasperKivimaeki 🇫🇮 817 126 302ms 4 Oct 2025 550th martinnorling 🇸🇪 816 66 15ms 27 Jan 2022 550th Powerroff 816 66 11ms 5 May 2024 552nd namcartoon06 815 78 2ms 30 Jun 2023 553rd edsrzf 🇳🇿 814 55 1,182ms 2 Sep 2025 554th GrayJoKing 🇦🇺 813 44 3ms 30 Apr 2021 554th o0lit3 🇺🇸 813 44 3ms 25 Jun 2021 554th perlebach 🇨🇿 813 44 3ms 19 Aug 2021 557th Shanethegamer 🇺🇸 812 50 38ms 11 May 2021 557th olivermrose 🇺🇸 812 50 37ms 21 Sep 2021 557th akshatj27 🇦🇶 812 50 37ms 11 Jan 2022 560th ovs-code 🇩🇪 812 63 498ms 15 Jan 2024 First Prev 481–560 of 2,040 Next Last