The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Forsyth–Edwards Notation 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 80th knutae 🇳🇴 587 143 9ms 13 Nov 2023 80th davecame 587 143 16ms 30 Nov 2023 80th keelimeguy 🇺🇸 587 143 32ms 7 May 2025 80th stefangimmillaro 587 143 11ms 23 May 2025 85th cros107 🇦🇺 583 144 10ms 26 Oct 2023 86th mathisfun271 579 145 9ms 18 Feb 2024 86th neihousaigaai 579 145 11ms 10 Apr 2025 88th OllieBoyne 🇬🇧 575 146 10ms 1 May 2023 88th Chimplement 575 146 10ms 13 Dec 2023 90th commandz0 🇺🇸 571 147 16ms 1 May 2023 90th SniperSmiley 🇺🇸 571 147 10ms 15 Aug 2023 90th fourth-bit 571 147 16ms 2 Jul 2024 90th logvp 571 147 10ms 7 Oct 2024 94th vhoulbreque 🇫🇷 568 148 10ms 2 Dec 2025 95th scpchicken 🇵🇼 564 149 10ms 1 May 2023 95th Vaekor 564 149 10ms 9 Jul 2023 95th Emutis 🇱🇹 564 149 10ms 26 Oct 2025 98th FranklinJiaChen 556 151 10ms 3 Aug 2024 98th Anonymousellama21 556 151 10ms 9 Aug 2024 100th AbhilashaTandon 553 152 10ms 21 Sep 2023 101st AlephSquirrel 549 153 10ms 1 May 2023 101st MaxElf999 549 153 10ms 2 May 2023 101st eiburns 549 153 10ms 5 May 2023 104th hellwue 538 156 10ms 3 May 2023 104th hiichbindermax 538 156 10ms 4 May 2023 106th alemelis 532 158 10ms 5 Oct 2024 106th Andrey135296 532 158 10ms 24 Nov 2024 108th andrewjc2000 528 159 10ms 30 Apr 2025 109th chartung17 522 161 10ms 1 Jan 2024 110th tobyLovick 519 162 9ms 29 Nov 2023 111th Babafaba 515 163 10ms 25 Oct 2025 112th adoxography 512 164 10ms 22 May 2023 112th nstearns96 🇬🇧 512 164 10ms 12 Nov 2024 112th snydej 512 164 9ms 21 Nov 2024 112th kitotch 512 164 10ms 6 days ago 116th rozium 509 165 11ms 11 Oct 2024 116th madex 🇩🇪 509 165 10ms 20 Jul 2025 118th msbranicky 506 166 10ms 5 Aug 2023 119th andre-lameirinhas 🇵🇹 500 168 11ms 5 May 2023 119th croc54 500 168 10ms 2 Dec 2024 119th BREMAUCY 🇫🇷 500 168 10ms 21 Aug 2025 122nd ehulinsky 🇺🇸 497 169 10ms 16 May 2023 122nd briankuder 497 169 9ms 20 Jun 2023 124th kaptsanovb 494 170 10ms 24 Sep 2023 125th TaserTheFox 🇺🇸 491 171 10ms 1 May 2023 126th CedricGebistorf 488 172 11ms 3 May 2023 126th inverseLorentz 🇦🇺 488 172 10ms 8 May 2023 126th stertooy 🇧🇪 488 172 32ms 20 Jun 2024 129th TheZwierzLF 🇵🇱 486 173 14ms 21 May 2025 130th Matter1024 🇮🇳 480 175 10ms 17 Feb 2026 131st celiendonze 🇨🇭 477 176 10ms 3 May 2023 132nd PhysicDev 🇫🇷 475 177 10ms 25 May 2023 133rd yuchuehw 472 178 11ms 3 Jan 2024 134th mbittner20 469 179 9ms 27 May 2023 134th Wildst 469 179 10ms 7 Jul 2023 136th KatieLG-Transpiler 🇬🇧 467 180 9ms 16 Aug 2024 137th bobbysq 462 182 10ms 25 May 2023 138th Stockoh 🇫🇷 457 184 10ms 1 May 2024 139th AstroOrbis 449 187 10ms 10 Feb 2026 140th Natanaelel 🇸🇪 447 188 10ms 5 May 2023 140th Kloppermand 🇩🇰 447 188 10ms 26 May 2023 140th mdnestor 447 188 10ms 27 May 2024 143rd Mikey-Beep 🇬🇧 440 191 16ms 28 Aug 2023 144th lelbal 438 192 10ms 17 Oct 2024 144th yjgnaw 438 192 10ms 24 Jul 2025 146th rollershutter 435 193 10ms 3 May 2023 147th te-chnical 431 195 10ms 19 Feb 2026 148th adamnielson42 🇺🇸 429 196 9ms 1 May 2023 149th elgan65536 🇺🇸 426 197 9ms 9 Nov 2024 149th Pyroan 426 197 9ms 3 Jan 2026 151st Masttest 424 198 9ms 31 Jan 2024 151st yokasuretsu 424 198 10ms 14 Jan 2025 153rd DrPrettyman 418 201 10ms 25 May 2023 153rd mrmena 🇦🇺 418 201 10ms 29 Mar 2024 155th m42km 416 202 10ms 3 Feb 2024 156th ridingqwerty 🇺🇸 414 203 10ms 30 Jan 2024 156th Andrey2001 414 203 10ms 1 Feb 2026 156th tomh1012 414 203 16ms 25 days ago 159th FortuiteMan 🇫🇷 412 204 16ms 11 Jul 2025 160th AbuzarN 410 205 17ms 22 Nov 2023 First Prev 81–160 of 191 Next Last