The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. 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 718th crhenley 🇺🇸 482 137 13ms 30 Oct 2023 718th Barry-Other-Barry 482 137 12ms 29 Jul 2025 723rd Matthewhine8 478 138 11ms 26 Aug 2025 724th Joashhh 475 139 11ms 1 Sep 2023 725th Lemonz-13223 471 140 11ms 12 May 2022 725th StoverGitHub 471 140 11ms 15 Jun 2022 725th NerdyMcNerd42 471 140 11ms 13 Aug 2022 725th Rythoka 471 140 11ms 17 Oct 2022 725th SkydivingSquid 471 140 10ms 29 Nov 2022 725th Pyro569 471 140 12ms 4 Jul 2023 725th tknight00 471 140 15ms 5 Mar 2024 732nd confy 468 141 11ms 28 Dec 2021 732nd doppelar0n 🇩🇪 468 141 12ms 2 Oct 2022 732nd desecaw13 468 141 11ms 24 Jan 2025 735th estomagordo 🇳🇱 465 142 12ms 9 Dec 2021 735th Armangharleghi1999 465 142 12ms 25 May 2022 735th roylucas 465 142 11ms 18 Jan 2023 735th sciencedjinn 465 142 11ms 8 Nov 2024 739th 201170 462 143 12ms 22 Aug 2022 739th Darknova2468 462 143 12ms 20 Nov 2022 739th N25CT13 462 143 12ms 20 Nov 2022 739th willdaspit 462 143 12ms 7 Aug 2023 743rd arinhyther 458 144 12ms 19 Jan 2023 743rd hidude562 458 144 11ms 1 Jul 2023 743rd ggmartin32 458 144 12ms 18 May 2024 746th jamespeilunli 455 145 18ms 20 Mar 2022 746th SaberSwordBoy 455 145 11ms 23 Apr 2022 746th PeterDekkers 455 145 12ms 7 Aug 2022 746th JackieAlacrity2373 455 145 12ms 12 Feb 2025 746th katss2 455 145 11ms 17 Aug 2025 751st Ole-Magnus-Hoi 452 146 11ms 12 Sep 2023 751st therealnumbers 452 146 11ms 17 Nov 2023 751st Neon-MT 452 146 12ms 18 Sep 2025 754th blankschyn 449 147 11ms 28 Dec 2021 754th enbyte 449 147 11ms 1 May 2023 754th quarl 449 147 12ms 12 Nov 2024 757th infinityTheorist 446 148 11ms 28 Jan 2024 758th CubingBadWolf 443 149 18ms 27 Feb 2022 758th Sharrrkkk 443 149 12ms 20 Jul 2025 760th ztaggart 440 150 11ms 5 Jan 2022 760th reni-hristova 440 150 11ms 28 Jan 2022 760th drewhead118 440 150 11ms 29 May 2022 760th DrPrettyman 440 150 11ms 23 Oct 2023 760th therandompersonn 440 150 10ms 28 Sep 2024 760th gelvetica 440 150 12ms 17 Nov 2024 766th BrysonHamlin 🇺🇸 437 151 12ms 2 Feb 2022 766th borosilicate 437 151 23ms 7 Apr 2022 766th HaiPaul 437 151 11ms 4 Mar 2024 769th rohith-kola 434 152 11ms 4 Oct 2024 770th Brain-Boy-53 429 154 11ms 17 Jun 2024 771st remijn 423 156 11ms 21 Mar 2023 771st dscarulla 423 156 11ms 11 Oct 2023 773rd Sturla22 420 157 17ms 1 Apr 2022 773rd haettead 420 157 10ms 19 Sep 2024 775th wvansolk 415 159 11ms 4 Oct 2023 775th joshua-el-samalouti 🇩🇪 415 159 11ms 26 May 2024 775th theonetruenerd 415 159 11ms 15 Aug 2024 778th RasmusBV 413 160 12ms 9 May 2022 778th pharmony01 413 160 11ms 24 Sep 2022 780th CllsPy 410 161 11ms 7 May 2024 781st katharine67 407 162 12ms 8 Oct 2022 782nd zt14427 405 163 13ms 28 Feb 2023 782nd Gusic06 405 163 18ms 13 Mar 2024 784th M053b 402 164 11ms 12 Sep 2022 784th brendantuckerman 402 164 11ms 19 Oct 2022 784th jmmographer 402 164 11ms 20 Oct 2023 787th contrick64 400 165 11ms 29 Mar 2024 788th pecholsjones 398 166 11ms 8 Dec 2021 788th Tagfox 398 166 11ms 16 Jul 2022 790th Bit125 395 167 12ms 28 Mar 2024 791st josephabbey 393 168 17ms 6 Apr 2022 792nd joeybranch 391 169 12ms 11 May 2024 793rd Mr-McChicken 388 170 13ms 4 Oct 2025 794th Ayushft 382 173 11ms 7 Dec 2021 794th Crabbex 382 173 11ms 14 Aug 2025 794th NoneTheFewer 382 173 11ms 25 Dec 2025 797th tterem 379 174 13ms 7 Jun 2022 798th Great-Gamer 377 175 12ms 24 Feb 2022 798th tmanternach 377 175 11ms 22 Nov 2022 800th a-penton 375 176 12ms 22 Sep 2022 First Prev 721–800 of 880 Next Last