The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Fibonacci in Elixir 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 1st Lydxn 🇨🇦 1,000 46 68ms 8 Jun 2022 1st GrayJoKing 🇦🇺 1,000 46 81ms 16 Jun 2022 1st Shanethegamer 🇺🇸 1,000 46 83ms 7 Nov 2022 1st Steffan153 🇫🇮 1,000 46 73ms 10 Dec 2022 1st JayXon 🇺🇸 1,000 46 73ms 21 Mar 2023 1st error256 1,000 46 73ms 16 Dec 2024 1st sean-niemann 🇺🇸 1,000 46 76ms 19 Apr 2025 8th btnlq 958 48 77ms 12 May 2023 8th DialFrost 🇸🇬 958 48 78ms 14 Nov 2024 8th pardouin 🇫🇷 958 48 77ms 23 Apr 2025 8th albanian-laundromat 958 48 69ms 15 Nov 2025 12th SirBogman 🇺🇸 920 50 72ms 10 Oct 2023 13th Yewzir 🇧🇪 868 53 67ms 9 Nov 2023 14th thomas9911 852 54 73ms 2 Jun 2022 14th MateuszPietrzak 🇵🇱 852 54 76ms 12 Dec 2023 14th edsrzf 🇳🇿 852 54 81ms 12 Sep 2024 14th jipsong 🇩🇪 852 54 77ms 8 Apr 2025 18th kgodara 821 56 78ms 18 Jan 2024 18th emgordon154 821 56 72ms 26 Jul 2024 18th evnu 821 56 72ms 20 Nov 2025 21st snoozingnewt 🇨🇦 807 57 72ms 8 Oct 2025 21st Andrey2001 807 57 80ms 23 Jan 2026 23rd tamanugi 🇯🇵 793 58 73ms 21 Nov 2022 23rd Yax42 🇫🇷 793 58 67ms 16 hours ago 25th nwunderly 697 66 81ms 26 Aug 2024 26th MeWhenI 🇻🇦 657 70 74ms 9 Apr 2024 27th cdevine49 648 71 72ms 17 May 2022 28th JRaspass 🇬🇧 582 79 71ms 17 May 2022 28th CaedenHarper 🇨🇦 582 79 72ms 26 Aug 2025 30th Zach1031 568 81 72ms 15 Nov 2025 31st Maximizer02 561 82 110ms 5 Oct 2023 31st epic-programmer-guy 561 82 78ms 3 Jan 2024 33rd mathisfun271 548 84 151ms 20 Feb 2024 33rd Pyroan 548 84 118ms 17 Dec 2025 35th HumanoidCPU 529 87 71ms 18 May 2024 36th voytxt 🇨🇿 505 91 69ms 15 May 2022 37th madeforlosers 495 93 113ms 21 Nov 2024 38th dokutan 489 94 166ms 21 Sep 2024 39th oceko 426 108 162ms 28 Nov 2022 40th CheeseCake628 🇳🇴 390 118 106ms 16 Jan 2024 41st Natanaelel 🇸🇪 351 131 80ms 16 May 2022 42nd Waffle3z 324 142 70ms 15 May 2022 42nd KatieLG 🇬🇧 324 142 84ms 16 May 2022 42nd KatieLG-Transpiler 🇬🇧 324 142 67ms 24 Jun 2022 42nd retrohun 324 142 73ms 27 Dec 2022 42nd StronkCheese 🇺🇸 324 142 77ms 25 Jan 2023 42nd Mabeloid 🇳🇴 324 142 76ms 18 Sep 2024 42nd gigaprofisi 🇺🇸 324 142 69ms 13 Nov 2025 49th Herbert00709 🇵🇱 279 165 72ms 31 Oct 2024 50th Adix-null 🇱🇹 266 173 75ms 30 Jul 2023 51st kkoenig 247 186 73ms 22 Dec 2023 52nd jtaxen 190 242 111ms 29 May 2024 1–52 of 52
