The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 33 hours. Why not try and solve them ahead of time?
Intersection 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 alexkunin 623 139 14ms 13 Oct 2020 722nd albanian-laundromat 623 245 44ms 5 Dec 2025 723rd SirBogman 🇺🇸 621 111 464ms 16 Jan 2024 724th MeWhenI 🇻🇦 621 356 1,672ms 7 Nov 2025 725th hklemp 🇩🇪 620 235 409ms 21 Nov 2021 726th snoozingnewt 🇨🇦 620 284 363ms 2 Oct 2025 727th inventshah 619 95 2ms 15 Nov 2022 727th Salutations45 619 95 2ms 19 Jan 2025 729th AlephSquirrel 618 124 43ms 3 Aug 2023 729th bricknellj 618 124 43ms 9 Oct 2025 731st retrohun 618 131 176ms 22 Feb 2026 732nd zakariamouhid 618 140 11ms 1 Mar 2023 733rd KatieLG 🇬🇧 618 215 731ms 19 May 2021 734th KrausRaus 🇺🇸 615 177 5ms 20 Jan 2022 735th KatieLG 🇬🇧 615 273 244ms 20 May 2021 736th eiburns 615 286 450ms 18 Dec 2020 736th Vaekor 615 286 432ms 9 Jul 2023 738th o0lit3 🇺🇸 614 73 21ms 1 Jul 2021 739th pxeger 🇬🇧 614 125 40ms 14 Feb 2022 739th PeterTillema 🇳🇱 614 125 21ms 29 Mar 2023 739th lynn 614 125 39ms 17 Oct 2023 742nd dsntzn 🇸🇰 614 141 11ms 13 Oct 2020 742nd lynn 614 141 11ms 30 Aug 2021 742nd FlorianCassayre 🇫🇷 614 141 10ms 14 Jun 2024 742nd Protothor 614 141 11ms 23 Jun 2025 742nd acollett89 614 141 10ms 25 Jul 2025 747th c0d3-4-F00d 🇩🇪 613 218 3ms 23 May 2022 748th dokutan 612 210 244ms 4 Jul 2024 749th MeWhenI 🇻🇦 612 213 34ms 7 Jun 2023 750th MeWhenI 🇻🇦 611 185 397ms 30 Jan 2023 751st ovs-code 🇩🇪 610 116 175ms 17 Apr 2025 752nd Maznek 610 142 10ms 31 Jan 2024 752nd junkondo-jp 610 142 12ms 5 May 2024 752nd Andrey-Plotnikov 610 142 10ms 17 May 2024 752nd Dataen 610 142 15ms 9 Jun 2024 756th KasperKivimaeki 🇫🇮 609 126 26ms 25 Oct 2025 756th ryyyn 🇺🇸 609 126 11ms 28 Jan 2026 758th balloffur 609 251 441ms 10 Dec 2025 759th boxjelly 609 289 435ms 21 Feb 2021 759th TeodorDyakov 🇧🇬 609 289 490ms 8 Jan 2026 761st Mikey-Beep 🇬🇧 608 184 14ms 17 Aug 2025 762nd osmith93 608 220 2ms 10 Jun 2021 763rd MeWhenI 🇻🇦 607 223 457ms 5 Mar 2022 764th ravnskjaer 🇩🇰 607 290 437ms 15 Dec 2025 765th LukeBridges 🇬🇧 606 210 2ms 17 Feb 2026 766th dokutan 605 117 134ms 15 Jun 2025 767th UBKorkut 605 143 11ms 12 Mar 2021 767th olleicua 🇺🇸 605 143 10ms 3 Feb 2024 769th andersk 🇺🇸 604 127 10ms 6 Oct 2020 769th scpchicken 🇵🇼 604 127 22ms 3 Jun 2024 771st zolivier 604 220 123ms 8 Dec 2021 772nd iznax 604 241 427ms 21 Nov 2021 773rd MeWhenI 🇻🇦 603 208 1,406ms 7 Jun 2023 774th Yewzir 🇧🇪 602 222 2ms 9 Feb 2024 774th prestosilver 🇺🇸 602 222 2ms 19 Feb 2026 776th daveberlin 601 144 12ms 21 Oct 2023 777th Jacob385 601 293 432ms 19 Mar 2024 777th yoshykai 601 293 438ms 28 Mar 2025 779th CaedenHarper 🇨🇦 599 128 30ms 29 Jul 2025 779th StefanHabel 🇨🇦 599 128 22ms 14 days ago 781st Yewzir 🇧🇪 598 215 242ms 14 Sep 2023 782nd czylabsonasa 🇭🇺 597 116 257ms 15 Jun 2022 783rd tomh1012 597 244 450ms 12 Jan 2026 784th AlephSquirrel 595 116 464ms 21 Jan 2024 784th m-tkach 🇺🇦 595 116 429ms 26 Jan 2024 786th mokymok 🇺🇸 595 129 11ms 23 Jul 2021 786th SirFireball3521 595 129 32ms 25 Jan 2023 786th adamnielson42 🇺🇸 595 129 19ms 21 Aug 2023 786th stertooy 🇧🇪 595 129 32ms 18 Jun 2024 786th edsrzf 🇳🇿 595 129 30ms 23 Oct 2025 791st geofft 595 136 158ms 10 Dec 2020 792nd Frowny 594 51 34ms 28 May 2021 793rd ryanlanegit 591 126 293ms 19 Jun 2022 794th marcin7Cd 590 130 11ms 8 Oct 2020 794th Attero 🇸🇪 590 130 10ms 27 Oct 2020 794th abailey2020 🇺🇸 590 130 11ms 12 Dec 2020 794th 0xtristan 590 130 10ms 18 Dec 2020 794th bastienvoirin 🇫🇷 590 130 10ms 4 Feb 2021 794th richard-oelze 🇩🇪 590 130 11ms 13 Feb 2021 794th neihousaigaai 590 130 11ms 17 Mar 2021 First Prev 721–800 of 1,360 Next Last