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 bytes. 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 Bytes Time Submitted 720th BrenSchaap 479 199 13ms 21 Oct 2021 720th scpchicken 🇵🇼 479 199 12ms 7 Mar 2022 720th thiccaxe 479 199 13ms 3 Oct 2022 720th DialFrost 🇸🇬 479 199 11ms 11 Feb 2023 720th jmerle 🇳🇱 479 199 15ms 17 Jul 2023 720th dainiak 479 199 14ms 23 Jul 2023 720th AbhilashaTandon 479 199 14ms 24 Sep 2023 720th Mabeloid 🇳🇴 479 199 11ms 7 Sep 2024 720th JunkIce 479 199 12ms 4 Oct 2024 720th wuduculfre 479 199 13ms 29 Jul 2025 720th katss2 479 199 14ms 14 Aug 2025 732nd tailorspy 478 229 77ms 25 Aug 2024 733rd Pimentero 🇷🇺 477 168 7ms 10 Nov 2022 734th dbkirk4211 477 178 11ms 3 May 2024 734th Salutations45 477 178 13ms 21 Dec 2024 736th SirFireball3521 477 200 45ms 25 Jan 2023 736th wuzekai518 477 200 14ms 28 Jun 2024 736th kistlerf 🇨🇭 477 200 13ms 14 May 2025 739th Bonjour27891 🇻🇳 475 201 13ms 4 Mar 2022 739th guilhem-roy 🇫🇷 475 201 15ms 9 May 2022 739th MaxElf999 475 201 12ms 19 Sep 2022 739th tri1212 🇻🇳 475 201 11ms 3 Jun 2024 739th cykim8811 475 201 11ms 10 Jul 2024 739th vgamula 🇺🇦 475 201 11ms 15 Jul 2025 739th Alex-Huggett 🇬🇧 475 201 14ms 14 Sep 2025 746th tetrogem 474 179 14ms 23 Aug 2025 747th marcin7Cd 472 202 13ms 25 Aug 2021 747th mbittner20 472 202 13ms 22 Sep 2024 749th danielphilpottwork 471 180 11ms 16 Sep 2024 749th kpal81xd 471 180 13ms 19 Sep 2024 751st dionjw 470 203 13ms 22 Mar 2022 751st pascscha 470 203 16ms 28 Mar 2022 751st za3k 470 203 14ms 12 Oct 2022 751st GolfingSuccess 🇬🇷 470 203 14ms 5 Dec 2022 751st suhren 470 203 13ms 1 Oct 2023 756th annaproxy 470 204 494ms 5 May 2022 757th Natanaelel 🇸🇪 469 317 168ms 25 Mar 2024 758th MeWhenI 🇻🇦 469 392 7ms 30 Nov 2022 759th MiffOttah 465 206 501ms 6 Oct 2024 760th Fishron 463 206 15ms 13 Jun 2022 760th ValentinCassayre 463 206 14ms 18 Oct 2023 762nd LostSyntax21 🇬🇧 461 207 13ms 6 Dec 2025 763rd Natanaelel 🇸🇪 460 124 156ms 2 Sep 2021 764th msbranicky 458 199 4,450ms 8 Jan 2025 765th KatieLG 🇬🇧 458 233 460ms 12 Oct 2024 766th p-vf 🇨🇭 456 210 435ms 24 Feb 2022 767th CaedenHarper 🇨🇦 455 184 546ms 18 Jan 2025 768th uttumuttu 🇫🇮 454 187 16ms 6 Jan 2022 769th bbakersmith 454 210 12ms 6 Jun 2022 770th dokutan 454 211 454ms 24 Nov 2025 771st CaedenHarper 🇨🇦 453 279 3ms 7 Nov 2025 772nd SniperSmiley 🇺🇸 452 211 13ms 18 Dec 2022 773rd madeforlosers 451 188 12ms 5 Mar 2025 773rd CaedenHarper 🇨🇦 451 188 17ms 23 Aug 2025 775th JRaspass 🇬🇧 450 144 4ms 26 Aug 2021 776th SB-945 450 212 13ms 14 Jul 2023 777th Yewzir 🇧🇪 450 243 475ms 15 Feb 2024 778th kyleclaassen 448 213 13ms 11 Mar 2022 778th yuchuehw 448 213 15ms 21 Jan 2024 778th RaBa21 🇭🇺 448 213 12ms 11 Aug 2025 781st postie77 448 214 467ms 19 May 2023 782nd NerdyMcNerd42 446 214 14ms 25 Oct 2022 783rd roavin 446 215 486ms 13 Jun 2022 784th HumanoidCPU 445 188 640ms 31 Oct 2024 785th prestosilver 🇺🇸 445 240 418ms 24 days ago 786th Yewzir 🇧🇪 445 287 385ms 3 Jan 2024 787th DialFrost 🇸🇬 444 191 16ms 28 Sep 2023 787th CarsonChr 🇺🇸 444 191 13ms 6 Apr 2024 789th CatsAreFluffy 444 215 13ms 30 Dec 2022 789th ridingqwerty 🇺🇸 444 215 14ms 13 Dec 2023 791st Maximizer02 444 294 7ms 26 Apr 2024 792nd alemelis 443 154 439ms 30 Sep 2024 793rd bbakersmith 443 200 16ms 7 Jun 2022 794th CaedenHarper 🇨🇦 443 254 781ms 16 Oct 2025 795th two-bad 🇬🇧 442 192 15ms 7 Feb 2024 795th Michiocre 442 192 13ms 20 Feb 2024 795th eranws 442 192 14ms 23 Dec 2024 798th amollberg 🇸🇪 442 216 12ms 8 Jan 2022 799th Ripick 441 242 480ms 11 Jul 2024 800th CaedenHarper 🇨🇦 441 290 350ms 2 Nov 2025 First Prev 721–800 of 1,330 Next Last
