The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Leyland Numbers 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 880th zwxzwxzwx21 657 92 17ms 30 Jan 2024 880th jameswmccarty 657 92 10ms 11 Jul 2024 880th PyryL 🇫🇮 657 92 9ms 22 Aug 2024 880th JesseNoEyes 🇺🇸 657 92 10ms 17 Nov 2024 885th GeorgeStechman 🇬🇧 657 102 11ms 15 Jun 2022 885th ShiraJoseph 🇺🇸 657 102 11ms 21 Jul 2023 885th acollett89 657 102 10ms 15 Jul 2025 888th nwellnhof 🇩🇪 654 64 4ms 28 Oct 2021 889th MeWhenI 🇻🇦 653 122 7ms 10 Sep 2022 890th JGDoerrer 653 183 226ms 5 Feb 2022 890th msbranicky 653 183 240ms 1 Oct 2023 892nd Attero 🇸🇪 652 68 112ms 18 Oct 2020 893rd Shanethegamer 🇺🇸 652 127 156ms 1 Mar 2022 894th Shanethegamer 🇺🇸 652 228 281ms 19 Apr 2022 895th snoozingnewt 🇨🇦 651 188 397ms 13 Oct 2025 896th adoxography 650 93 10ms 8 Oct 2020 896th nullie 650 93 10ms 9 Jun 2022 896th julienlamoureux78 650 93 13ms 18 Aug 2022 896th CatsAreFluffy 650 93 11ms 21 Dec 2023 896th Mikey-Beep 🇬🇧 650 93 10ms 2 Jun 2024 896th Papushkado 650 93 12ms 18 Nov 2025 896th klixel 🇨🇦 650 93 10ms 9 Jan 2026 903rd richard-oelze 🇩🇪 650 103 9ms 26 May 2021 903rd Yewzir 🇧🇪 650 103 10ms 18 Apr 2023 903rd dokutan 650 103 10ms 20 Apr 2025 906th timmickey 650 108 4ms 30 Dec 2022 907th Shanethegamer 🇺🇸 650 116 1ms 2 Nov 2022 908th ovs-code 🇩🇪 650 118 4ms 2 Feb 2023 909th snoozingnewt 🇨🇦 649 119 8ms 13 Oct 2025 910th wuzekai518 649 184 216ms 17 Jul 2024 911th CheeseCake628 🇳🇴 647 89 482ms 17 Jan 2024 911th namelessiw 647 89 489ms 5 Mar 2024 913th primo-ppcg 🇹🇭 646 150 7ms 2 Oct 2020 914th jared-hughes 645 117 2ms 6 Mar 2022 914th NickTheEASDude 🇺🇸 645 117 1ms 9 May 2024 916th sisyphus-ppcg 🇦🇺 644 65 3ms 17 Oct 2023 917th adoxography 644 104 10ms 8 Oct 2020 917th albanian-laundromat 644 104 12ms 16 Dec 2025 919th FlyingPenguin223 643 66 43ms 11 Nov 2024 920th bbakersmith 643 94 9ms 18 Jul 2021 920th jfallon1997 643 94 11ms 9 Aug 2022 920th wobblybits 643 94 10ms 19 Aug 2025 923rd MeWhenI 🇻🇦 642 149 49ms 4 Sep 2024 924th DialFrost 🇸🇬 641 96 1,325ms 20 Nov 2024 925th dokutan 641 116 8ms 16 Jul 2024 926th snoozingnewt 🇨🇦 638 93 1,168ms 13 Oct 2025 927th a6166231 🇨🇳 638 105 12ms 5 Jun 2025 927th snoozingnewt 🇨🇦 638 105 10ms 11 Oct 2025 929th LeeCamp 636 95 10ms 27 Dec 2021 929th 4ndyJ 🇬🇧 636 95 9ms 7 Feb 2023 929th 0-ag 636 95 11ms 25 Aug 2025 929th nemoyatpeace 636 95 10ms 14 Jan 2026 929th TheSecondComing123 636 95 11ms 5 Feb 2026 934th emgordon154 635 166 2ms 11 Jan 2026 935th snoozingnewt 🇨🇦 635 178 673ms 13 Oct 2025 936th Lv0Sys 🇵🇱 633 67 38ms 3 Dec 2025 937th TheZwierzLF 🇵🇱 633 91 447ms 17 Dec 2025 938th juliansiebert 🇩🇪 633 179 442ms 2 Mar 2025 939th MeWhenI 🇻🇦 632 96 6ms 14 Nov 2022 940th GusGold 632 106 10ms 17 Nov 2020 940th wansacis 🇩🇪 632 106 13ms 11 Nov 2021 942nd Shanethegamer 🇺🇸 632 144 6ms 4 Oct 2024 943rd jared-hughes 632 167 1ms 24 Jun 2022 944th Natanaelel 🇸🇪 631 55 2ms 29 Jun 2023 945th Psirving 630 96 10ms 29 Jul 2020 945th henrytranter 630 96 10ms 27 Aug 2020 945th chrishm909 630 96 11ms 23 May 2021 945th sleepyStick 630 96 16ms 3 Dec 2021 945th tterem 630 96 11ms 8 Jun 2022 945th sbyrne51 630 96 10ms 1 Oct 2022 951st Shanethegamer 🇺🇸 628 195 493ms 25 Sep 2025 952nd GolfingSuccess 🇬🇷 626 97 2ms 16 Oct 2024 953rd elisherer 🇮🇱 626 107 12ms 2 Aug 2020 954th KatieLG 🇬🇧 626 181 383ms 21 Oct 2022 955th snoozingnewt 🇨🇦 625 71 108ms 13 Oct 2025 956th Irratix 🇳🇱 625 199 202ms 3 Jan 2022 957th Shanethegamer 🇺🇸 624 166 2,949ms 31 Oct 2024 958th denkyuu1 623 69 436ms 27 days ago 959th asadullayev 623 97 15ms 3 Mar 2021 959th befoster 623 97 10ms 10 Apr 2021 First Prev 881–960 of 1,896 Next Last