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 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 michelebastione 🇮🇹 789 90 10ms 24 Aug 2020 641st ArmaanAS 789 90 10ms 11 Mar 2021 641st cb597 789 90 10ms 23 Jul 2022 641st 0-4849 789 90 10ms 4 Nov 2022 641st namelessiw 789 90 10ms 9 Jul 2024 641st denkyuu1 789 90 10ms 15 Feb 2026 647th btnlq 789 123 2ms 20 Mar 2021 648th Ethernet3 🇳🇱 788 158 2,932ms 11 Mar 2022 649th bac0id 787 144 391ms 30 Jun 2024 650th lynn 787 148 30ms 17 Oct 2023 651st chordowl 787 152 224ms 17 Mar 2021 652nd ReidZ3 🇺🇸 786 87 120ms 5 Dec 2020 652nd Z-snails 786 87 118ms 2 Mar 2023 654th scpchicken 🇵🇼 785 60 130ms 2 Feb 2022 655th Apataras 785 156 430ms 7 Oct 2025 655th kmathis22 785 156 407ms 15 Oct 2025 657th Andriamanitra 🇫🇮 784 60 38ms 26 Jul 2023 657th olleicua 🇺🇸 784 60 35ms 23 Apr 2025 659th JunkIce 783 84 452ms 3 Dec 2024 660th pschmid0 🇺🇸 782 90 5ms 7 Aug 2022 661st rifatx 782 145 461ms 9 Jul 2024 662nd prplz 🇦🇺 782 149 31ms 3 Oct 2023 663rd ovs-code 🇩🇪 781 79 1,377ms 8 Oct 2023 664th sean-niemann 🇺🇸 781 125 453ms 20 Sep 2025 665th stefangimmillaro 781 153 3,260ms 17 Oct 2023 665th inverseLorentz 🇦🇺 781 153 224ms 22 Apr 2024 667th MeWhenI 🇻🇦 780 86 12ms 1 Jul 2023 668th marcin7Cd 780 91 10ms 11 Dec 2020 668th schachmattmatt 780 91 9ms 2 Oct 2021 668th amollberg 🇸🇪 780 91 10ms 15 Jan 2022 668th Bonjour27891 🇻🇳 780 91 10ms 4 Mar 2022 668th nstearns96 🇬🇧 780 91 19ms 29 Nov 2022 668th AlexanderFair 780 91 10ms 11 Jul 2023 668th adamnielson42 🇺🇸 780 91 11ms 22 Aug 2023 668th jhu04 780 91 11ms 18 Jan 2024 668th jacekwladzinski 780 91 9ms 4 Oct 2025 677th ScottHamper 780 157 532ms 30 Nov 2025 678th armin-k1 778 72 3ms 9 Sep 2021 678th scpchicken 🇵🇼 778 72 9ms 15 Dec 2022 680th retrohun 778 78 4ms 14 Feb 2026 681st primo-ppcg 🇹🇭 778 111 44ms 30 May 2025 682nd m-tkach 🇺🇦 775 103 4ms 31 Jan 2024 683rd DialFrost 🇸🇬 775 126 471ms 10 Nov 2025 684th namcartoon06 774 161 2,919ms 30 Jun 2023 685th janbehrens 🇩🇪 773 58 463ms 1 Nov 2021 685th alemelis 773 58 467ms 12 Apr 2023 685th m-tkach 🇺🇦 773 58 470ms 24 May 2024 685th Lv0Sys 🇵🇱 773 58 1,186ms 3 Dec 2025 689th GrayJoKing 🇦🇺 773 73 5ms 16 Aug 2024 690th CaedenHarper 🇨🇦 773 77 846ms 9 Sep 2025 691st mstang107 772 92 16ms 20 Dec 2023 691st jameswmccarty 772 92 10ms 11 Jul 2024 691st PyryL 🇫🇮 772 92 9ms 22 Aug 2024 691st JesseNoEyes 🇺🇸 772 92 10ms 17 Nov 2024 695th akshatj27 🇦🇶 771 61 36ms 11 Jan 2022 695th orthoplex 🇨🇽 771 61 38ms 1 Apr 2022 695th OhmNomNom 771 61 41ms 14 Oct 2022 695th Shanethegamer 🇺🇸 771 61 36ms 8 Apr 2023 695th tatzyr 🇯🇵 771 61 38ms 30 Mar 2025 700th LucaArgentiUCF 🇮🇹 771 112 41ms 14 Feb 2021 700th SirBogman 🇺🇸 771 112 39ms 4 Nov 2024 702nd CaedenHarper 🇨🇦 771 147 409ms 21 Oct 2025 703rd ovs-code 🇩🇪 771 155 245ms 21 Apr 2025 704th sean-niemann 🇺🇸 770 79 4ms 30 Oct 2022 705th Yewzir 🇧🇪 769 162 2,962ms 3 Feb 2023 706th kurkale6ka 767 73 3ms 17 Aug 2021 707th emgordon154 767 194 306ms 18 Jan 2025 708th msbranicky 765 86 404ms 17 Jan 2024 708th Andrey2001 765 86 455ms 1 Feb 2026 710th emgordon154 765 109 8ms 10 Dec 2024 711th 5quiwyrm 764 74 285ms 9 Dec 2024 712th adoxography 764 93 10ms 8 Oct 2020 712th nullie 764 93 10ms 9 Jun 2022 712th julienlamoureux78 764 93 13ms 18 Aug 2022 712th CatsAreFluffy 764 93 11ms 21 Dec 2023 712th elgan65536 🇺🇸 764 93 9ms 31 Mar 2024 712th Mikey-Beep 🇬🇧 764 93 10ms 2 Jun 2024 712th Papushkado 764 93 12ms 18 Nov 2025 712th klixel 🇨🇦 764 93 10ms 9 Jan 2026 720th NewDefectus 🇮🇱 764 95 48ms 8 Jul 2021 First Prev 641–720 of 1,913 Next Last