The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 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 Shanethegamer 🇺🇸 624 140 5ms 14 Mar 2025 722nd alexkunin 623 139 14ms 13 Oct 2020 723rd albanian-laundromat 623 245 44ms 5 Dec 2025 724th SirBogman 🇺🇸 621 111 464ms 16 Jan 2024 725th MeWhenI 🇻🇦 621 356 1,672ms 7 Nov 2025 726th hklemp 🇩🇪 620 235 409ms 21 Nov 2021 727th snoozingnewt 🇨🇦 620 284 363ms 2 Oct 2025 728th inventshah 619 95 2ms 15 Nov 2022 728th Salutations45 619 95 2ms 19 Jan 2025 730th AlephSquirrel 618 124 43ms 3 Aug 2023 730th bricknellj 618 124 43ms 9 Oct 2025 732nd retrohun 618 131 176ms 22 Feb 2026 733rd zakariamouhid 618 140 11ms 1 Mar 2023 734th KatieLG 🇬🇧 618 215 731ms 19 May 2021 735th KrausRaus 🇺🇸 615 177 5ms 20 Jan 2022 736th KatieLG 🇬🇧 615 273 244ms 20 May 2021 737th eiburns 615 286 450ms 18 Dec 2020 737th Vaekor 615 286 432ms 9 Jul 2023 739th o0lit3 🇺🇸 614 73 21ms 1 Jul 2021 740th pxeger 🇬🇧 614 125 40ms 14 Feb 2022 740th PeterTillema 🇳🇱 614 125 21ms 29 Mar 2023 740th lynn 614 125 39ms 17 Oct 2023 743rd dsntzn 🇸🇰 614 141 11ms 13 Oct 2020 743rd lynn 614 141 11ms 30 Aug 2021 743rd FlorianCassayre 🇫🇷 614 141 10ms 14 Jun 2024 743rd Protothor 614 141 11ms 23 Jun 2025 743rd acollett89 614 141 10ms 25 Jul 2025 748th c0d3-4-F00d 🇩🇪 613 218 3ms 23 May 2022 749th dokutan 612 210 244ms 4 Jul 2024 750th MeWhenI 🇻🇦 612 213 34ms 7 Jun 2023 751st MeWhenI 🇻🇦 611 185 397ms 30 Jan 2023 752nd ovs-code 🇩🇪 610 116 175ms 17 Apr 2025 753rd Maznek 610 142 10ms 31 Jan 2024 753rd junkondo-jp 610 142 12ms 5 May 2024 753rd Andrey-Plotnikov 610 142 10ms 17 May 2024 753rd Dataen 610 142 15ms 9 Jun 2024 757th KasperKivimaeki 🇫🇮 609 126 26ms 25 Oct 2025 757th ryyyn 🇺🇸 609 126 11ms 28 Jan 2026 759th balloffur 609 251 441ms 10 Dec 2025 760th boxjelly 609 289 435ms 21 Feb 2021 760th TeodorDyakov 🇧🇬 609 289 490ms 8 Jan 2026 762nd Mikey-Beep 🇬🇧 608 184 14ms 17 Aug 2025 763rd osmith93 608 220 2ms 10 Jun 2021 764th MeWhenI 🇻🇦 607 223 457ms 5 Mar 2022 765th ravnskjaer 🇩🇰 607 290 437ms 15 Dec 2025 766th LukeBridges 🇬🇧 606 210 2ms 17 Feb 2026 767th dokutan 605 117 134ms 15 Jun 2025 768th UBKorkut 605 143 11ms 12 Mar 2021 768th olleicua 🇺🇸 605 143 10ms 3 Feb 2024 770th andersk 🇺🇸 604 127 10ms 6 Oct 2020 770th scpchicken 🇵🇼 604 127 22ms 3 Jun 2024 772nd zolivier 604 220 123ms 8 Dec 2021 773rd iznax 604 241 427ms 21 Nov 2021 774th MeWhenI 🇻🇦 603 208 1,406ms 7 Jun 2023 775th Yewzir 🇧🇪 602 222 2ms 9 Feb 2024 775th prestosilver 🇺🇸 602 222 2ms 19 Feb 2026 777th daveberlin 601 144 12ms 21 Oct 2023 778th Jacob385 601 293 432ms 19 Mar 2024 778th yoshykai 601 293 438ms 28 Mar 2025 780th CaedenHarper 🇨🇦 599 128 30ms 29 Jul 2025 780th StefanHabel 🇨🇦 599 128 22ms 14 days ago 782nd Yewzir 🇧🇪 598 215 242ms 14 Sep 2023 783rd czylabsonasa 🇭🇺 597 116 257ms 15 Jun 2022 784th tomh1012 597 244 450ms 12 Jan 2026 785th AlephSquirrel 595 116 464ms 21 Jan 2024 785th m-tkach 🇺🇦 595 116 429ms 26 Jan 2024 787th mokymok 🇺🇸 595 129 11ms 23 Jul 2021 787th SirFireball3521 595 129 32ms 25 Jan 2023 787th adamnielson42 🇺🇸 595 129 19ms 21 Aug 2023 787th stertooy 🇧🇪 595 129 32ms 18 Jun 2024 787th edsrzf 🇳🇿 595 129 30ms 23 Oct 2025 792nd geofft 595 136 158ms 10 Dec 2020 793rd Frowny 594 51 34ms 28 May 2021 794th ryanlanegit 591 126 293ms 19 Jun 2022 795th marcin7Cd 590 130 11ms 8 Oct 2020 795th Attero 🇸🇪 590 130 10ms 27 Oct 2020 795th abailey2020 🇺🇸 590 130 11ms 12 Dec 2020 795th 0xtristan 590 130 10ms 18 Dec 2020 795th bastienvoirin 🇫🇷 590 130 10ms 4 Feb 2021 795th richard-oelze 🇩🇪 590 130 11ms 13 Feb 2021 First Prev 721–800 of 1,360 Next Last