The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 hours. Why not try and solve them ahead of time?
φ 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 561st Yewzir 🇧🇪 826 108 469ms 6 Jun 2024 562nd annaproxy 824 42 2,065ms 28 Jan 2022 563rd inventshah 824 58 11ms 27 May 2021 563rd emgordon154 824 58 10ms 30 Nov 2021 563rd daniel-pedersen 🇸🇪 824 58 11ms 6 Mar 2022 563rd DialFrost 🇸🇬 824 58 29ms 29 Jul 2024 567th emplv 🇱🇻 824 128 283ms 20 Dec 2022 568th flawr 822 69 124ms 2 Jan 2019 569th DialFrost 🇸🇬 821 56 165ms 3 Aug 2024 570th MeWhenI 🇻🇦 821 88 555ms 28 Feb 2022 571st namelessiw 818 109 428ms 25 Nov 2025 572nd cduerm 818 129 294ms 12 May 2020 572nd MeWhenI 🇻🇦 818 129 287ms 9 Feb 2023 574th yokasuretsu 816 62 47ms 19 Apr 2018 574th thisishowmymindworks 🇳🇴 816 62 10ms 17 Oct 2020 574th Shanethegamer 🇺🇸 816 62 13ms 22 Mar 2021 574th KatieLG 🇬🇧 816 62 12ms 6 May 2021 574th QuincyNash 🇺🇸 816 62 13ms 14 Jan 2022 574th jmerle 🇳🇱 816 62 13ms 22 Jan 2022 574th hiichbindermax 816 62 12ms 25 Feb 2022 574th CarsonChr 🇺🇸 816 62 12ms 21 Sep 2022 574th ValentinCassayre 816 62 13ms 9 Oct 2022 574th hellwue 816 62 13ms 8 Feb 2023 574th crispshaker 816 62 12ms 18 Mar 2023 574th bac0id 816 62 13ms 26 Sep 2023 574th enbyte 816 62 13ms 9 Dec 2023 574th zwxzwxzwx21 816 62 13ms 30 Jan 2024 574th roupiq 🇵🇱 816 62 13ms 18 Apr 2024 574th Herbert00709 🇵🇱 816 62 19ms 8 May 2024 574th vgamula 🇺🇦 816 62 12ms 18 May 2024 574th JOrE20 816 62 213ms 19 Feb 2026 592nd ovs-code 🇩🇪 813 30 424ms 5 Jan 2024 593rd DialFrost 🇸🇬 812 89 584ms 29 Jul 2024 594th edsrzf 🇳🇿 812 100 470ms 17 Nov 2025 595th SirBogman 🇺🇸 811 72 1,430ms 4 Jan 2022 596th piano-miles 810 59 19ms 19 Feb 2023 596th CatsAreFluffy 810 59 12ms 19 Feb 2023 596th Steffan153 🇫🇮 810 59 7ms 12 Dec 2023 596th dokutan 810 59 6ms 31 Dec 2023 596th DialFrost 🇸🇬 810 59 6ms 16 Dec 2024 596th kg583 🇺🇸 810 59 7ms 15 Sep 2025 602nd DialFrost 🇸🇬 808 125 51ms 7 May 2025 603rd o0lit3 🇺🇸 806 28 39ms 29 Sep 2021 603rd tidalDisruptionEvent 🇨🇦 806 28 40ms 10 Mar 2023 605th MeWhenI 🇻🇦 804 101 1,611ms 7 Nov 2025 606th jhu04 803 63 10ms 24 Sep 2022 606th Command-Master 803 63 10ms 23 Sep 2023 608th DialFrost 🇸🇬 801 155 1,624ms 18 Jan 2026 609th elgan65536 🇺🇸 799 132 309ms 18 Nov 2023 610th ovs-code 🇩🇪 798 62 5ms 11 Mar 2023 611th cywong-amino 🇭🇰 797 60 41ms 2 Jul 2020 611th didion0 🇺🇸 797 60 11ms 9 Feb 2022 611th dmrichwa 🇺🇸 797 60 15ms 15 Jun 2022 614th ovs-code 🇩🇪 796 60 384ms 10 Dec 2023 615th DialFrost 🇸🇬 796 66 1,279ms 23 Aug 2024 616th DialFrost 🇸🇬 796 102 496ms 26 Sep 2025 616th stefangimmillaro 796 102 621ms 6 Oct 2025 618th SirBogman 🇺🇸 796 112 479ms 21 Nov 2021 619th MeWhenI 🇻🇦 792 89 141ms 15 Oct 2022 620th LucasBertocchini 790 64 10ms 11 Dec 2020 620th walterfeyman 790 64 12ms 30 Oct 2021 620th davidsaltacc 790 64 13ms 16 Nov 2023 620th MaxElf999 790 64 9ms 15 Feb 2024 620th KasperKivimaeki 🇫🇮 790 64 73ms 16 Jul 2025 625th ovs-code 🇩🇪 789 102 1,116ms 18 Dec 2025 626th annaproxy 789 113 492ms 5 Apr 2022 626th CaedenHarper 🇨🇦 789 113 807ms 19 Oct 2025 628th prplz 🇦🇺 788 56 592ms 25 Jun 2020 629th namelessiw 788 103 380ms 7 Oct 2025 630th primo-ppcg 🇹🇭 788 133 68ms 11 Dec 2025 630th sean-niemann 🇺🇸 788 133 76ms 23 Dec 2025 632nd roguh 🇬🇹 786 63 5ms 26 Jan 2024 633rd Yax42 🇫🇷 782 114 423ms 25 Dec 2024 634th SirBogman 🇺🇸 782 134 66ms 25 May 2023 635th MeWhenI 🇻🇦 781 43 43ms 29 Dec 2024 636th dokutan 781 59 345ms 14 Feb 2026 637th lifthrasiir 🇰🇷 781 316 1,392ms 15 Dec 2024 638th ovs-code 🇩🇪 779 59 263ms 3 Aug 2024 638th emgordon154 779 59 134ms 10 Aug 2024 640th yzhs 🇩🇪 778 65 13ms 25 Oct 2020 First Prev 561–640 of 2,495 Next Last