The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 717th Barry-Other-Barry 482 137 12ms 29 Jul 2025 722nd Matthewhine8 478 138 11ms 26 Aug 2025 723rd Joashhh 475 139 11ms 1 Sep 2023 724th Lemonz-13223 471 140 11ms 12 May 2022 724th StoverGitHub 471 140 11ms 15 Jun 2022 724th NerdyMcNerd42 471 140 11ms 13 Aug 2022 724th Rythoka 471 140 11ms 17 Oct 2022 724th SkydivingSquid 471 140 10ms 29 Nov 2022 724th Pyro569 471 140 12ms 4 Jul 2023 724th tknight00 471 140 15ms 5 Mar 2024 731st confy 468 141 11ms 28 Dec 2021 731st doppelar0n 🇩🇪 468 141 12ms 2 Oct 2022 731st desecaw13 468 141 11ms 24 Jan 2025 734th estomagordo 🇳🇱 465 142 12ms 9 Dec 2021 734th Armangharleghi1999 465 142 12ms 25 May 2022 734th roylucas 465 142 11ms 18 Jan 2023 734th sciencedjinn 465 142 11ms 8 Nov 2024 738th 201170 462 143 12ms 22 Aug 2022 738th Darknova2468 462 143 12ms 20 Nov 2022 738th N25CT13 462 143 12ms 20 Nov 2022 738th willdaspit 462 143 12ms 7 Aug 2023 742nd arinhyther 458 144 12ms 19 Jan 2023 742nd hidude562 458 144 11ms 1 Jul 2023 742nd ggmartin32 458 144 12ms 18 May 2024 745th jamespeilunli 455 145 18ms 20 Mar 2022 745th SaberSwordBoy 455 145 11ms 23 Apr 2022 745th PeterDekkers 455 145 12ms 7 Aug 2022 745th JackieAlacrity2373 455 145 12ms 12 Feb 2025 745th katss2 455 145 11ms 17 Aug 2025 750th Ole-Magnus-Hoi 452 146 11ms 12 Sep 2023 750th therealnumbers 452 146 11ms 17 Nov 2023 750th Neon-MT 452 146 12ms 18 Sep 2025 753rd blankschyn 449 147 11ms 28 Dec 2021 753rd enbyte 449 147 11ms 1 May 2023 753rd quarl 449 147 12ms 12 Nov 2024 756th infinityTheorist 446 148 11ms 28 Jan 2024 757th CubingBadWolf 443 149 18ms 27 Feb 2022 757th Sharrrkkk 443 149 12ms 20 Jul 2025 759th ztaggart 440 150 11ms 5 Jan 2022 759th reni-hristova 440 150 11ms 28 Jan 2022 759th drewhead118 440 150 11ms 29 May 2022 759th DrPrettyman 440 150 11ms 23 Oct 2023 759th therandompersonn 440 150 10ms 28 Sep 2024 759th gelvetica 440 150 12ms 17 Nov 2024 765th BrysonHamlin 🇺🇸 437 151 12ms 2 Feb 2022 765th borosilicate 437 151 23ms 7 Apr 2022 765th HaiPaul 437 151 11ms 4 Mar 2024 768th rohith-kola 434 152 11ms 4 Oct 2024 769th Brain-Boy-53 429 154 11ms 17 Jun 2024 770th remijn 423 156 11ms 21 Mar 2023 770th dscarulla 423 156 11ms 11 Oct 2023 772nd Sturla22 420 157 17ms 1 Apr 2022 772nd haettead 420 157 10ms 19 Sep 2024 774th wvansolk 415 159 11ms 4 Oct 2023 774th joshua-el-samalouti 🇩🇪 415 159 11ms 26 May 2024 774th theonetruenerd 415 159 11ms 15 Aug 2024 777th RasmusBV 413 160 12ms 9 May 2022 777th pharmony01 413 160 11ms 24 Sep 2022 779th CllsPy 410 161 11ms 7 May 2024 780th katharine67 407 162 12ms 8 Oct 2022 781st zt14427 405 163 13ms 28 Feb 2023 781st Gusic06 405 163 18ms 13 Mar 2024 783rd M053b 402 164 11ms 12 Sep 2022 783rd brendantuckerman 402 164 11ms 19 Oct 2022 783rd jmmographer 402 164 11ms 20 Oct 2023 786th contrick64 400 165 11ms 29 Mar 2024 787th pecholsjones 398 166 11ms 8 Dec 2021 787th Tagfox 398 166 11ms 16 Jul 2022 789th Bit125 395 167 12ms 28 Mar 2024 790th josephabbey 393 168 17ms 6 Apr 2022 791st joeybranch 391 169 12ms 11 May 2024 792nd Mr-McChicken 388 170 13ms 4 Oct 2025 793rd Ayushft 382 173 11ms 7 Dec 2021 793rd Crabbex 382 173 11ms 14 Aug 2025 793rd NoneTheFewer 382 173 11ms 25 Dec 2025 796th tterem 379 174 13ms 7 Jun 2022 797th Great-Gamer 377 175 12ms 24 Feb 2022 797th tmanternach 377 175 11ms 22 Nov 2022 799th a-penton 375 176 12ms 22 Sep 2022 799th LookAgain2 375 176 11ms 20 Dec 2022 First Prev 721–800 of 879 Next Last