The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Arrows 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 721st bastienvoirin 🇫🇷 543 133 13ms 14 Sep 2021 721st adoxography 543 133 11ms 28 Sep 2021 721st martinnorling 🇸🇪 543 133 14ms 25 Feb 2022 724th Shnapster 543 164 487ms 28 Sep 2023 725th johanrosenson 541 151 15ms 8 Dec 2021 726th ovs-code 🇩🇪 540 136 4ms 27 Sep 2024 727th janbehrens 🇩🇪 540 165 469ms 21 Nov 2021 728th zbreit 🇺🇸 539 134 14ms 6 May 2023 728th yousefalizadeh 539 134 13ms 7 Apr 2024 730th LukeBridges 🇬🇧 537 152 16ms 11 Apr 2024 731st postie77 536 166 467ms 19 May 2023 732nd rschwa6308 🇺🇸 535 135 12ms 5 May 2023 732nd Bmrl7 535 135 14ms 29 Mar 2024 732nd moustave 535 135 13ms 29 Nov 2024 732nd LostSyntax21 🇬🇧 535 135 13ms 6 Dec 2025 732nd ahmetdemirag 🇨🇾 535 135 11ms 4 Jan 2026 737th amazingalek 🇳🇴 533 167 492ms 1 Jan 2026 738th BlankSpruce 531 136 15ms 7 Sep 2022 739th Florian-Mt 530 154 14ms 9 Jul 2024 740th adriweb 🇫🇷 528 176 3ms 9 Aug 2023 741st The3gs 527 137 15ms 16 Aug 2023 741st alexjurkiewicz 🇦🇺 527 137 11ms 7 Nov 2023 743rd Giga-Bowser 527 155 15ms 6 Jan 2022 743rd smclaughlin-cf 527 155 13ms 6 May 2025 745th billings7 🇬🇧 527 169 421ms 21 Nov 2021 745th c0d3-4-F00d 🇩🇪 527 169 453ms 21 Nov 2021 747th bitsandbeyond 🇳🇱 527 172 132ms 17 Dec 2025 748th Yewzir 🇧🇪 525 194 689ms 4 Feb 2023 749th NicoAdams 523 138 15ms 25 Nov 2021 749th bbakersmith 523 138 12ms 6 Jun 2022 749th jacekwladzinski 523 138 11ms 8 Oct 2025 752nd Yewzir 🇧🇪 523 197 10ms 18 Dec 2024 753rd PlatoHero 522 119 240ms 11 Dec 2023 754th Mabeloid 🇳🇴 521 127 505ms 18 Sep 2024 755th AshyIsMe 🇦🇺 520 117 47ms 24 Jul 2022 756th CaedenHarper 🇨🇦 520 145 2,243ms 24 Aug 2025 757th Ephellon 520 157 13ms 16 Dec 2023 758th janAkali 🇷🇺 520 194 461ms 20 May 2024 758th Ripick 520 194 480ms 11 Jul 2024 760th angel-p57 🇯🇵 519 516 2ms 21 Nov 2023 761st blaztoma 🇱🇹 517 111 45ms 16 Oct 2025 762nd inventshah 517 279 7ms 30 Dec 2022 763rd kistlerf 🇨🇭 516 140 13ms 14 May 2025 763rd Emutis 🇱🇹 516 140 14ms 27 Oct 2025 765th Apataras 516 210 679ms 29 Jul 2025 766th arcpolaris 515 173 558ms 14 Jan 2026 767th janbehrens 🇩🇪 513 158 2ms 21 Mar 2022 768th Mabeloid 🇳🇴 513 181 2ms 21 Sep 2024 769th msbranicky 512 141 24ms 11 Aug 2023 769th MWI-polygolf 512 141 14ms 6 Dec 2023 771st aresok 511 212 659ms 2 Jul 2023 772nd marcin7Cd 509 142 13ms 25 Aug 2021 772nd smartiel 509 142 44ms 18 Sep 2022 772nd NerdyMcNerd42 509 142 14ms 25 Oct 2022 772nd b10011 🇫🇮 509 142 14ms 7 Jan 2023 776th kimbo 🇺🇸 509 238 382ms 28 Dec 2022 776th msbranicky 509 238 389ms 31 Aug 2023 778th Yewzir 🇧🇪 507 304 2,675ms 14 Nov 2025 779th ian-h-chamberlain 🇺🇸 506 271 54ms 2 Nov 2025 780th Mikey-Beep 🇬🇧 505 143 11ms 25 Aug 2023 780th gamk3 505 143 14ms 6 May 2025 782nd Natanaelel 🇸🇪 504 117 3ms 24 Aug 2021 783rd Irratix 🇳🇱 504 161 3ms 21 Dec 2021 784th FrederikHutfless 🇩🇪 504 162 15ms 12 Jan 2023 784th BambooleanLogic 🇸🇪 504 162 13ms 19 Oct 2023 786th CaedenHarper 🇨🇦 503 177 459ms 16 Oct 2025 787th dokutan 502 131 271ms 4 Feb 2026 788th InigoK 🇺🇸 502 144 18ms 12 Aug 2022 788th thiccaxe 502 144 13ms 3 Oct 2022 788th StefanHabel 🇨🇦 502 144 13ms 14 Nov 2022 788th TaserTheFox 🇺🇸 502 144 14ms 3 Jan 2023 788th codingisgreatbutiamnot 502 144 11ms 24 Aug 2024 793rd msbranicky 502 270 268ms 3 Oct 2023 794th Shanethegamer 🇺🇸 501 97 163ms 8 Dec 2021 795th lewdev 🇺🇸 501 163 13ms 14 Mar 2024 796th CaedenHarper 🇨🇦 501 168 2ms 23 Aug 2025 797th roguh 🇬🇹 498 145 14ms 22 Jan 2024 798th CatsAreFluffy 498 163 2ms 15 Jan 2023 799th MeWhenI 🇻🇦 496 148 4ms 2 Oct 2022 800th bobbysq 495 146 13ms 10 May 2023 First Prev 721–800 of 1,327 Next Last