The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 26 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 560th h3ra993huskp 🇯🇵 696 253 411ms 30 Nov 2025 562nd johnnythedoggie 695 191 117ms 8 Feb 2021 563rd MeWhenI 🇻🇦 695 220 429ms 8 May 2022 564th JRaspass 🇬🇧 694 228 275ms 12 Aug 2023 565th DrPiranoid 693 193 2ms 5 Apr 2023 566th annaproxy 693 210 415ms 22 Feb 2022 566th Shanethegamer 🇺🇸 693 210 409ms 1 Jun 2022 566th postie77 693 210 398ms 31 May 2023 566th GodlyProgrammer1 693 210 412ms 2 Dec 2025 570th Shanethegamer 🇺🇸 692 79 36ms 24 Mar 2023 571st alemelis 692 100 353ms 3 Sep 2024 572nd btjones0 692 117 7ms 9 Jan 2021 573rd trinityy-7 692 125 10ms 25 Jul 2025 573rd madeforlosers 692 125 10ms 6 hours ago 575th albanian-laundromat 692 351 1,503ms 27 Oct 2025 576th Rubiksmath 691 111 22ms 26 Aug 2024 577th Irratix 🇳🇱 691 221 440ms 3 Jan 2022 578th raphaelimahorn 690 255 381ms 18 days ago 579th dymowski 689 158 5ms 3 Aug 2021 580th MathisBullinger 687 126 11ms 15 Nov 2021 581st MeWhenI 🇻🇦 687 187 183ms 3 days ago 582nd snoozingnewt 🇨🇦 686 123 363ms 14 Oct 2025 583rd bbonenfant 686 245 240ms 21 Nov 2020 584th sisyphus-ppcg 🇦🇺 685 112 22ms 30 Nov 2025 584th zacjl 685 112 23ms 30 Nov 2025 584th xnor-gate 685 112 23ms 2 Dec 2025 587th Shanethegamer 🇺🇸 685 165 403ms 6 Nov 2021 588th jared-hughes 685 223 2,929ms 23 Oct 2022 588th 386asm 🇺🇸 685 223 43ms 27 Apr 2023 588th MateuszPietrzak 🇵🇱 685 223 449ms 9 Jan 2024 591st betaveros 684 38 63ms 10 Aug 2022 592nd DialFrost 🇸🇬 683 80 40ms 5 Jan 2023 593rd Bubbler-4 683 101 429ms 16 Jan 2024 594th cbrt-x 683 178 145ms 19 Sep 2023 595th omurakazuaki 🇯🇵 682 127 11ms 17 Feb 2021 595th levinwinter 682 127 11ms 14 Nov 2025 597th lynn 682 164 15ms 17 Nov 2021 598th dokutan 682 184 43ms 4 Oct 2024 599th janbehrens 🇩🇪 682 219 2ms 14 Sep 2022 600th adriweb 🇫🇷 680 165 2ms 14 Sep 2023 601st JDiLenarda 🇫🇷 680 214 390ms 18 Nov 2023 602nd MeWhenI 🇻🇦 677 128 11ms 9 May 2024 603rd billings7 🇬🇧 677 215 409ms 21 Nov 2021 604th ovs-code 🇩🇪 676 102 562ms 1 Dec 2025 605th jared-hughes 676 128 11ms 7 Sep 2021 605th janbehrens 🇩🇪 676 128 12ms 2 Dec 2021 605th dokutan 676 128 11ms 15 Jun 2025 608th jared-hughes 675 120 103ms 17 Jul 2022 609th djeedjay 🇳🇱 675 198 2ms 25 Oct 2020 609th LorenzoDeGaspari 675 198 2ms 2 May 2024 611th snoozingnewt 🇨🇦 674 197 108ms 2 Oct 2025 612th Jacob385 673 114 17ms 24 Feb 2024 612th Seek64 🇩🇪 673 114 18ms 30 Nov 2025 614th snoozingnewt 🇨🇦 673 227 2,934ms 6 Oct 2025 615th Laellekoenig 671 129 10ms 14 Nov 2025 615th alexsave 671 129 10ms 15 Nov 2025 617th janAkali 🇷🇺 670 190 3ms 17 Feb 2026 618th jgbaldwinbrown 670 236 300ms 29 Jun 2021 619th stefangimmillaro 669 153 2,718ms 31 Oct 2024 619th emgordon154 669 153 2,651ms 24 Jul 2025 619th jkelly467 669 153 2,888ms 16 Feb 2026 622nd KatieLG 🇬🇧 668 163 5ms 19 May 2021 623rd KatieLG 🇬🇧 668 218 406ms 1 May 2024 624th blaztoma 🇱🇹 667 115 40ms 24 days ago 625th mdznr 667 199 124ms 14 Dec 2020 626th KatieLG 🇬🇧 666 82 38ms 2 Oct 2025 627th iznax 666 130 10ms 7 Oct 2020 627th stefangimmillaro 666 130 12ms 20 Jun 2023 629th CaedenHarper 🇨🇦 664 265 416ms 3 Oct 2025 630th DaDerpDuck 663 169 2ms 20 Jan 2021 631st saito-ta 🇯🇵 663 238 1,169ms 4 Jul 2022 632nd LHLaurini 🇧🇷 662 202 2ms 30 Jun 2024 633rd CatsAreFluffy 662 231 59ms 12 Dec 2022 634th cbrt-x 662 266 467ms 29 Sep 2021 635th BrunoVisnadi 🇧🇷 661 116 46ms 8 Oct 2025 636th Waffle3z 661 131 9ms 8 Jul 2021 636th DayDun 🇸🇪 661 131 12ms 19 Jan 2023 636th DanielVenable 661 131 10ms 7 Aug 2025 639th verticallity 661 254 176ms 6 Apr 2022 640th edsrzf 🇳🇿 660 155 2,966ms 25 Oct 2024 First Prev 561–640 of 1,360 Next Last