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 876th epic-programmer-guy 661 158 10ms 31 Dec 2023 876th robin-scragg 661 158 11ms 9 Oct 2025 883rd Shanethegamer 🇺🇸 661 200 42ms 10 Sep 2024 884th janbehrens 🇩🇪 660 267 444ms 16 May 2023 885th primo-ppcg 🇹🇭 659 98 38ms 14 Oct 2020 886th lowlighter 659 137 14ms 1 Nov 2020 886th boxjelly 659 137 11ms 7 Feb 2021 886th randolchance 659 137 10ms 29 Dec 2022 889th emgordon154 659 139 5ms 30 Dec 2024 890th memmaptensor 🇹🇭 659 221 404ms 21 Jan 2022 891st Yewzir 🇧🇪 659 232 440ms 27 Jan 2024 892nd KatieLG 🇬🇧 658 121 1,336ms 25 Apr 2021 893rd janbehrens 🇩🇪 658 206 439ms 19 Jul 2022 894th glesnick 657 159 10ms 15 Jul 2022 895th MeWhenI 🇻🇦 657 194 6ms 11 Oct 2023 896th VictorChemin 🇫🇷 657 205 2ms 26 Nov 2021 896th pyrolitic 🇮🇪 657 205 2ms 26 Apr 2022 896th CatsAreFluffy 657 205 2ms 25 Jan 2023 899th JunkIce 655 137 476ms 3 Dec 2024 900th MattShaile 655 138 11ms 19 Apr 2022 900th ShiraJoseph 🇺🇸 655 138 10ms 6 May 2023 900th two-bad 🇬🇧 655 138 11ms 24 Feb 2024 900th xShadowBlade 655 138 11ms 26 Dec 2024 904th GrayJoKing 🇦🇺 655 171 89ms 24 Nov 2021 905th Shanethegamer 🇺🇸 654 140 5ms 14 Mar 2025 906th vezzick 653 160 10ms 5 Mar 2021 906th roguh 🇬🇹 653 160 10ms 23 Jan 2024 908th stefangimmillaro 653 167 185ms 18 Sep 2022 909th HumanoidCPU 650 138 490ms 1 Nov 2024 910th alexkunin 650 139 14ms 13 Oct 2020 910th XenThe 🇬🇧 650 139 11ms 21 Jun 2025 910th snoozingnewt 🇨🇦 650 139 12ms 2 Oct 2025 913th TRexOnGit 650 224 426ms 29 Nov 2024 914th ehulinsky 🇺🇸 649 161 28ms 15 Sep 2021 914th WillowWispy 649 161 11ms 14 Mar 2025 916th Maximizer02 649 166 12ms 30 Jul 2024 917th edsrzf 🇳🇿 649 168 5ms 6 Oct 2024 918th boxjelly 648 208 2ms 17 Feb 2021 919th ryanlanegit 647 126 293ms 19 Jun 2022 920th zakariamouhid 645 140 11ms 1 Mar 2023 921st Marthe-CC 645 162 10ms 16 Oct 2022 921st Cynopolis 645 162 10ms 17 Oct 2023 923rd rak1507 🇬🇧 644 58 35ms 5 Nov 2021 923rd dpinchbe 644 58 33ms 6 Sep 2024 925th AlephSquirrel 644 194 7ms 21 Oct 2024 926th DialFrost 🇸🇬 644 198 4ms 27 May 2025 927th jared-hughes 644 288 12ms 6 Jul 2024 928th jgbaldwinbrown 642 210 2ms 29 Jun 2021 929th Adelzu 642 227 405ms 21 Nov 2021 929th joelgduggan 642 227 384ms 21 Nov 2021 931st dsntzn 🇸🇰 641 141 11ms 13 Oct 2020 931st lynn 641 141 11ms 30 Aug 2021 931st FlorianCassayre 🇫🇷 641 141 10ms 14 Jun 2024 931st Protothor 641 141 11ms 23 Jun 2025 931st acollett89 641 141 10ms 25 Jul 2025 936th stefangimmillaro 640 101 60ms 26 Dec 2024 937th bwat2 640 275 424ms 21 Apr 2022 937th crizin 🇰🇷 640 275 440ms 15 Sep 2023 939th emgordon154 638 347 1,728ms 28 Dec 2025 940th Wildst 637 164 11ms 7 Jul 2023 940th jameswmccarty 637 164 12ms 28 Mar 2025 942nd Maznek 636 142 10ms 31 Jan 2024 942nd junkondo-jp 636 142 12ms 5 May 2024 942nd Andrey-Plotnikov 636 142 10ms 17 May 2024 942nd Dataen 636 142 15ms 9 Jun 2024 946th castur1 636 229 400ms 31 Jan 2022 947th warmCabin 635 212 2ms 15 Apr 2022 948th Shanethegamer 🇺🇸 634 143 109ms 6 Dec 2024 949th za3k 633 165 10ms 9 Oct 2022 950th UBKorkut 632 143 11ms 12 Mar 2021 950th olleicua 🇺🇸 632 143 10ms 3 Feb 2024 952nd snoozingnewt 🇨🇦 632 266 234ms 2 Oct 2025 953rd bac0id 631 279 471ms 27 Jun 2024 954th Chinay-Domitrix 🇺🇸 629 163 2,811ms 25 Mar 2025 955th SniperSmiley 🇺🇸 629 166 10ms 15 Jun 2022 955th DrPrettyman 629 166 10ms 11 Jul 2023 955th askipio 629 166 11ms 22 Nov 2023 955th qwjhvbxi 629 166 10ms 10 Feb 2024 955th prestosilver 🇺🇸 629 166 11ms 17 Feb 2026 960th Schmitt-Very-Cool 629 280 478ms 30 Sep 2025 First Prev 881–960 of 1,363 Next Last