The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 78 mins. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar in Python 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 134th wobblybits 795 83 11ms 15 Aug 2025 134th shelerr 795 83 11ms 21 Aug 2025 134th BrunoVisnadi 🇧🇷 795 83 11ms 17 Oct 2025 134th 09cf 795 83 10ms 8 Nov 2025 134th CommandLeo 🇮🇹 795 83 11ms 12 Nov 2025 134th HPWiz 🇳🇿 795 83 11ms 25 Nov 2025 134th LostSyntax21 🇬🇧 795 83 11ms 30 Nov 2025 134th 77Tigers 795 83 11ms 9 Jan 2026 134th skaravind 795 83 11ms 19 Jan 2026 134th FranklinJiaChen 795 83 11ms 15 Feb 2026 134th netfri25 🇮🇱 795 83 11ms 17 Feb 2026 134th rotemkm 795 83 11ms 20 Feb 2026 134th hoomishalom 795 83 11ms 20 Feb 2026 134th Lv0Sys 🇵🇱 795 83 11ms 27 Feb 2026 134th solisolu 795 83 12ms 14 days ago 134th professor-l 795 83 12ms 2 days ago 134th blaztoma 🇱🇹 795 83 11ms 73 mins ago 258th Jaydosu 786 84 10ms 3 Dec 2021 258th bwat2 786 84 13ms 14 Dec 2021 258th Altrul 786 84 12ms 4 Feb 2022 258th dzybine 786 84 11ms 28 Feb 2022 258th Drew-j-Smith 786 84 11ms 28 Mar 2022 258th Jaca1878 786 84 11ms 13 May 2022 258th TrentGlimp 786 84 10ms 3 Sep 2022 258th NoahBolohan 🇨🇦 786 84 11ms 1 Feb 2023 258th DragonaireM 786 84 12ms 7 Feb 2023 258th Hortaros 786 84 11ms 15 Apr 2023 258th celiendonze 🇨🇭 786 84 11ms 28 Apr 2023 258th cgringmuth 786 84 11ms 29 Jun 2023 258th NanduBC 786 84 11ms 6 Sep 2024 258th Vexxter9 🇳🇱 786 84 12ms 25 Sep 2024 258th agreegious 786 84 11ms 17 Nov 2024 258th Natanaelel 🇸🇪 786 84 11ms 21 Jan 2025 258th Emutis 🇱🇹 786 84 12ms 44 mins ago 275th AshGriffiths 776 85 37ms 7 Aug 2022 275th fredrik-bakke 🇳🇴 776 85 41ms 3 Nov 2022 275th aeonsablaze 776 85 11ms 22 Nov 2022 275th oceko 776 85 36ms 24 Mar 2023 275th Griff95 776 85 38ms 19 Sep 2023 275th VictorStenvers 🇳🇱 776 85 11ms 13 Nov 2023 275th anarconic 776 85 36ms 6 Dec 2023 275th christensendaniel 776 85 39ms 15 May 2024 283rd tr0mb0n3man 767 86 11ms 6 Dec 2021 283rd Trunksistor 🇫🇷 767 86 11ms 21 Apr 2022 283rd Mikey-Beep 🇬🇧 767 86 12ms 30 Jun 2022 283rd nstearns96 🇬🇧 767 86 11ms 27 Oct 2022 283rd CodeAltF4 767 86 11ms 14 Mar 2023 283rd musicallyanna 767 86 11ms 3 Apr 2023 283rd jhu04 767 86 11ms 26 Apr 2023 283rd ritwinnarra 767 86 11ms 11 Jun 2023 283rd rollershutter 767 86 10ms 1 Jul 2023 283rd saladleaf 767 86 11ms 24 Jul 2023 283rd tobeannouncd 767 86 39ms 19 Sep 2023 283rd wen1now 767 86 12ms 6 Nov 2023 283rd janeclange 767 86 11ms 13 Nov 2023 283rd MrAleborg 767 86 11ms 19 Nov 2023 283rd mar-moraes 767 86 39ms 13 Feb 2024 283rd BoBz200 767 86 11ms 30 Sep 2024 283rd nemulilonala 767 86 11ms 22 Nov 2024 283rd KingReeve 767 86 12ms 25 Nov 2024 283rd JOrE-Softwares 767 86 11ms 1 Jun 2025 283rd EthanJantz 767 86 12ms 15 Aug 2025 283rd NicoPlayZ9002-YT 767 86 12ms 6 Jan 2026 304th IoLimmer 759 87 11ms 16 Jul 2024 304th imelxr 🇮🇱 759 87 11ms 14 Aug 2024 306th chayleaf 750 88 42ms 7 Jan 2022 306th mhenion8293 🇺🇸 750 88 11ms 23 Jan 2022 306th henrytranter 750 88 41ms 25 Jan 2022 306th Andriamanitra 🇫🇮 750 88 12ms 14 Jul 2022 306th Kacarott 🇦🇺 750 88 12ms 20 Sep 2023 306th bzijlema 🇳🇱 750 88 11ms 2 Nov 2023 306th fbe 750 88 37ms 14 Dec 2024 306th TheSecondComing123 750 88 11ms 5 Feb 2026 314th CuboidRaptor 🇨🇦 742 89 13ms 18 Jan 2022 314th PhysicDev 🇫🇷 742 89 11ms 15 Mar 2022 314th martinnorling 🇸🇪 742 89 43ms 20 Jun 2022 314th OllieBoyne 🇬🇧 742 89 11ms 11 Sep 2022 314th jsthope 742 89 11ms 28 Sep 2022 314th randolchance 742 89 11ms 20 Jan 2023 314th Skwerl23 742 89 11ms 19 May 2023 First Prev 241–320 of 880 Next Last