The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. Why not try and solve them ahead of time?
SI Units 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 161st MeWhenI 🇻🇦 733 658 193ms 19 Jul 2025 162nd MeWhenI 🇻🇦 733 720 49ms 19 Jul 2025 163rd rucin93 🇵🇱 731 518 17ms 22 Oct 2025 164th KasperKivimaeki 🇫🇮 730 542 4ms 1 Dec 2025 165th MeWhenI 🇻🇦 729 664 175ms 3 days ago 166th GolfingSuccess 🇬🇷 726 526 1,018ms 7 Dec 2025 167th annaproxy 724 500 20ms 28 May 2023 168th Steffan153 🇫🇮 722 866 7ms 26 Feb 2024 169th blaztoma 🇱🇹 721 502 14ms 15 Dec 2025 170th blaztoma 🇱🇹 719 636 168ms 29 Dec 2025 171st sean-niemann 🇺🇸 719 694 661ms 8 Dec 2025 172nd MeWhenI 🇻🇦 716 448 77ms 4 Apr 2023 173rd CaedenHarper 🇨🇦 715 534 766ms 16 Oct 2025 174th snoozingnewt 🇨🇦 715 769 218ms 20 Nov 2025 175th KatieLG 🇬🇧 714 535 688ms 5 Oct 2025 176th stefangimmillaro 713 450 40ms 23 Jul 2023 177th ZakkkkAttackkkk 🇵🇭 712 508 211ms 18 Sep 2023 177th neel11235813 712 508 367ms 17 Mar 2024 179th KasperKivimaeki 🇫🇮 710 585 455ms 8 Dec 2025 180th MichalMarsalek 🇨🇿 704 514 16ms 1 Apr 2023 181st MeWhenI 🇻🇦 703 515 23ms 23 May 2024 182nd kg583 🇺🇸 701 516 147ms 28 Jul 2024 182nd Artemis21 🇬🇧 701 516 87ms 14 Jan 2025 184th JOrE20 698 543 19ms 7 Feb 2026 185th AlephSquirrel 697 764 20ms 21 Oct 2024 186th tomtheisen 🇺🇸 692 656 495ms 30 Jan 2025 187th commandz0 🇺🇸 689 525 40ms 1 Sep 2025 188th janbehrens 🇩🇪 688 725 762ms 24 Apr 2023 189th StefanHabel 🇨🇦 687 527 14ms 3 Apr 2023 190th janbehrens 🇩🇪 678 601 14ms 2 Jul 2023 190th targrik 678 601 30ms 1 Dec 2025 192nd KatieLG 🇬🇧 677 535 13ms 5 Oct 2025 193rd byronknoll 🇺🇸 676 560 17ms 12 May 2024 194th jeff-at-tamer-dot-codes 🇺🇸 672 539 306ms 30 May 2023 194th GolfingSuccess 🇬🇷 672 539 29ms 7 Dec 2025 196th MeWhenI 🇻🇦 672 602 1,726ms 15 Sep 2025 197th CornerMercury 🇬🇧 669 541 51ms 28 Feb 2026 198th dokutan 669 723 220ms 7 Aug 2024 199th msbranicky 669 844 352ms 10 Sep 2023 200th stefangimmillaro 668 827 47ms 4 Jun 2025 201st JDiLenarda 🇫🇷 666 773 1,463ms 3 Jul 2025 202nd janbehrens 🇩🇪 665 683 433ms 24 Apr 2023 203rd Natanaelel 🇸🇪 664 483 57ms 4 Sep 2024 204th CaedenHarper 🇨🇦 664 545 97ms 11 Dec 2025 205th ahmetdemirag 🇨🇾 657 551 17ms 28 Jun 2024 206th dokutan 655 803 4ms 19 Oct 2024 207th stefangimmillaro 650 557 13ms 10 Nov 2023 208th duckyluuk 🇳🇱 650 588 679ms 27 Mar 2024 209th janbehrens 🇩🇪 647 559 24ms 24 Jun 2023 210th dokutan 647 699 21ms 21 Aug 2024 211th BambooleanLogic 🇸🇪 643 589 23ms 1 Jul 2023 212th byronknoll 🇺🇸 642 647 3,508ms 18 Feb 2024 213th albanian-laundromat 640 597 858ms 4 Aug 2025 214th MeWhenI 🇻🇦 640 706 94ms 12 Apr 2024 215th jared-hughes 637 568 20ms 28 Sep 2025 216th Natanaelel 🇸🇪 634 747 226ms 28 Jun 2025 217th byronknoll 🇺🇸 632 573 16ms 3 Mar 2024 218th MeWhenI 🇻🇦 632 613 785ms 15 Nov 2023 219th MeWhenI 🇻🇦 632 685 585ms 19 Jul 2025 220th CaedenHarper 🇨🇦 631 600 41ms 5 Sep 2025 221st emgordon154 630 765 226ms 15 Nov 2024 222nd TheZwierzLF 🇵🇱 625 611 809ms 12 Dec 2025 223rd byronknoll 🇺🇸 624 634 4ms 18 Feb 2024 224th stefangimmillaro 624 695 171ms 17 Sep 2023 225th uttumuttu 🇫🇮 622 609 18ms 22 Dec 2023 225th trinityy-7 622 609 12ms 23 Jul 2025 227th h3ra993huskp 🇯🇵 621 804 724ms 30 Nov 2025 228th plcc0 618 586 18ms 29 Mar 2025 228th Lv0Sys 🇵🇱 618 586 13ms 25 Feb 2026 230th nathanadams 🇳🇿 618 613 23ms 24 Apr 2023 231st emgordon154 612 898 28ms 10 Jun 2025 232nd dokutan 608 1,029 6ms 2 Jul 2025 233rd duckyluuk 🇳🇱 606 597 18ms 28 Feb 2024 234th retrohun 606 1,031 9ms 27 May 2023 235th OllieBoyne 🇬🇧 603 600 14ms 10 Apr 2023 236th MeWhenI 🇻🇦 602 677 12ms 19 Jul 2025 237th gifti258 602 731 85ms 15 Sep 2023 238th albanian-laundromat 601 602 13ms 23 Nov 2025 239th hacker112 🇸🇪 597 635 15ms 14 Jun 2024 240th yzhs 🇩🇪 597 793 215ms 2 Jul 2023 First Prev 161–240 of 453 Next Last