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?
Intersection 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 641st kkoenig 740 182 2ms 19 Dec 2023 642nd CaedenHarper 🇨🇦 740 197 392ms 17 Oct 2025 643rd m-tkach 🇺🇦 738 205 60ms 16 Jun 2022 644th MeWhenI 🇻🇦 737 108 1,326ms 12 May 2023 645th logvp 736 142 10ms 3 Jan 2024 645th countlpaul-dotcom 736 142 10ms 19 Oct 2025 647th FlyingPenguin223 736 162 3ms 16 Mar 2025 648th Heathcorp 🇦🇺 736 183 2ms 11 Apr 2022 648th snoozingnewt 🇨🇦 736 183 2ms 23 Sep 2023 648th madex 🇩🇪 736 183 2ms 9 Jul 2024 651st Shanethegamer 🇺🇸 736 203 3ms 10 Sep 2022 652nd Yewzir 🇧🇪 736 301 1,733ms 17 May 2024 653rd roguh 🇬🇹 735 122 548ms 23 Jan 2024 654th didion0 🇺🇸 735 123 11ms 25 May 2022 655th bac0id 735 208 2,904ms 27 Jun 2024 656th sean-niemann 🇺🇸 733 204 4ms 18 Jan 2025 657th Frowny 732 51 34ms 28 May 2021 658th hiichbindermax 731 143 30ms 24 Feb 2022 658th SaswatPadhi 731 143 10ms 5 Sep 2022 660th KenanSi 730 37 3ms 23 Feb 2022 661st Salutations45 729 124 9ms 17 Nov 2024 662nd brimstonetrader 729 167 144ms 31 Jan 2024 663rd aliakseikalosha 729 200 381ms 21 Nov 2021 663rd ericlangedijk 🇸🇮 729 200 401ms 26 Feb 2022 665th MeWhenI 🇻🇦 728 102 4ms 13 Aug 2024 666th lynn 728 185 2ms 2 Oct 2021 666th jared-hughes 728 185 2ms 23 Oct 2022 668th Alex-x90 🇺🇸 728 210 455ms 15 Jul 2023 668th m-tkach 🇺🇦 728 210 457ms 18 Jul 2023 670th Shanethegamer 🇺🇸 728 242 394ms 24 Sep 2025 671st jgbaldwinbrown 726 144 10ms 29 Jun 2021 671st HumanoidCPU 726 144 10ms 1 Nov 2024 671st rollershutter 726 144 10ms 8 Oct 2025 671st Aphadion 726 144 11ms 19 Feb 2026 675th ognen98 725 211 440ms 15 Jun 2023 676th DialFrost 🇸🇬 725 243 381ms 24 Sep 2025 677th o0lit3 🇺🇸 724 87 24ms 1 Nov 2021 678th ognen98 724 186 2ms 15 Jun 2023 679th primo-ppcg 🇹🇭 724 209 59ms 7 Mar 2022 680th trinityy-7 723 125 10ms 25 Jul 2025 681st jared-hughes 723 155 19ms 27 Nov 2021 682nd adriweb 🇫🇷 723 165 2ms 14 Sep 2023 683rd Shanethegamer 🇺🇸 722 108 300ms 14 Jun 2021 683rd janbehrens 🇩🇪 722 108 258ms 19 Jul 2022 685th maggym00 721 145 10ms 27 Apr 2021 685th AkashTandon167 721 145 11ms 25 May 2021 685th LeeCamp 721 145 10ms 9 Dec 2021 685th eshilo-draper 721 145 17ms 15 Jun 2023 685th Ythaenagor 721 145 17ms 5 Aug 2024 685th JunkIce 721 145 17ms 4 Oct 2024 691st roavin 721 202 402ms 26 Jul 2022 692nd Shanethegamer 🇺🇸 721 212 420ms 30 Mar 2023 693rd HallMatthew314 720 169 148ms 14 Feb 2022 694th Vinterion 720 187 2ms 21 Jun 2024 694th bac0id 720 187 2ms 27 Jun 2024 694th MeWhenI 🇻🇦 720 187 2ms 5 Jul 2024 697th sean-niemann 🇺🇸 719 82 2ms 12 Aug 2024 698th albanian-laundromat 719 128 1,170ms 23 Sep 2025 699th DialFrost 🇸🇬 719 208 3ms 27 May 2025 700th kg583 🇺🇸 718 184 46ms 10 Feb 2026 701st MathisBullinger 717 126 11ms 15 Nov 2021 702nd aditsu 717 143 2,665ms 11 Aug 2025 703rd Shanethegamer 🇺🇸 717 188 2ms 24 Dec 2021 704th Shanethegamer 🇺🇸 717 211 58ms 23 Apr 2023 705th MisterrLuck 716 146 10ms 3 Sep 2023 705th Command-Master 716 146 11ms 24 Sep 2023 705th solisolu 716 146 10ms 7 Nov 2025 705th error256 716 146 15ms 16 Feb 2026 709th stefangimmillaro 716 173 117ms 21 Oct 2022 710th inventshah 715 109 300ms 14 Nov 2022 710th DialFrost 🇸🇬 715 109 303ms 23 Jan 2024 712th Heathcorp 🇦🇺 715 214 69ms 11 Apr 2022 712th tailorspy 715 214 426ms 2 Nov 2023 712th madex 🇩🇪 715 214 69ms 9 Jul 2024 712th Lv0Sys 🇵🇱 715 214 71ms 31 May 2025 716th boxjelly 715 235 228ms 9 Feb 2021 717th MeWhenI 🇻🇦 713 153 5ms 28 May 2023 718th TeodorDyakov 🇧🇬 713 189 2ms 3 Jul 2025 719th dokutan 712 126 536ms 12 Aug 2024 719th albanian-laundromat 712 126 475ms 3 Nov 2025 First Prev 641–720 of 1,363 Next Last