The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Kolakoski Sequence in Python 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 79th Shanethegamer 🇺🇸 897 58 30ms 18 Jan 2023 79th Alex-x90 🇺🇸 897 58 30ms 23 Mar 2023 79th neel11235813 897 58 29ms 24 Mar 2023 79th Natanaelel 🇸🇪 897 58 11ms 11 Apr 2023 79th InigoK 🇺🇸 897 58 28ms 28 May 2023 79th jmerle 🇳🇱 897 58 29ms 3 Jul 2023 79th ndren 897 58 31ms 4 Aug 2023 79th FlorianCassayre 🇫🇷 897 58 19ms 13 Sep 2023 79th Kacarott 🇦🇺 897 58 28ms 13 Oct 2023 79th m42km 897 58 28ms 25 Nov 2023 79th NickTheEASDude 🇺🇸 897 58 27ms 1 Jul 2024 79th namelessiw 897 58 30ms 27 Jul 2024 79th edsrzf 🇳🇿 897 58 19ms 22 Nov 2024 79th croc54 897 58 30ms 9 Jan 2025 79th andrewjc2000 897 58 29ms 11 Mar 2025 79th Mukundan314 897 58 32ms 27 Apr 2025 79th fkantelberg 897 58 20ms 12 Jul 2025 79th wuduculfre 897 58 29ms 22 Jul 2025 79th HETHAT 🇩🇿 897 58 30ms 24 Sep 2025 79th CornerMercury 🇬🇧 897 58 29ms 24 Nov 2025 79th snoozingnewt 🇨🇦 897 58 18ms 1 Dec 2025 102nd marcin7Cd 881 59 10ms 16 Jan 2021 102nd rak1507 🇬🇧 881 59 10ms 20 Jan 2021 102nd AlephSquirrel 881 59 11ms 13 May 2021 102nd rschwa6308 🇺🇸 881 59 10ms 28 Jun 2021 102nd NewDefectus 🇮🇱 881 59 12ms 25 Oct 2021 102nd jacksonhenry3 881 59 13ms 21 Dec 2021 102nd NicoAdams 881 59 12ms 21 Dec 2021 102nd aksyristos 881 59 10ms 28 Feb 2023 102nd BREMAUCY 🇫🇷 881 59 11ms 27 Apr 2023 102nd 2011-Chan-Ethan 881 59 11ms 17 Jul 2023 102nd MarcMush 🇫🇷 881 59 10ms 12 Feb 2024 102nd albanian-laundromat 881 59 13ms 13 Apr 2025 102nd plcc0 881 59 11ms 13 Jan 2026 102nd CommandLeo 🇮🇹 881 59 11ms 18 Jan 2026 102nd pengu1n-master 881 59 11ms 10 Feb 2026 117th AGoyet 867 60 13ms 29 Jun 2022 117th jakobkordez 🇸🇮 867 60 16ms 8 Nov 2022 117th betaveros 867 60 20ms 31 Dec 2022 117th AlexanderFair 867 60 11ms 23 Jun 2023 117th Andriamanitra 🇫🇮 867 60 14ms 20 Jul 2023 117th dranjohn 867 60 47ms 15 Sep 2023 117th SB-945 867 60 10ms 20 Feb 2024 117th inverseLorentz 🇦🇺 867 60 11ms 9 Apr 2024 117th 051 🇸🇬 867 60 11ms 1 Aug 2024 117th vgamula 🇺🇦 867 60 33ms 28 Jul 2025 117th LuisGoncalves05 🇵🇹 867 60 11ms 29 Jul 2025 117th solisolu 867 60 11ms 1 Jan 2026 129th petroselo 852 61 10ms 16 Nov 2021 129th Irratix 🇳🇱 852 61 11ms 8 Dec 2021 129th cubed-guy 852 61 11ms 12 Feb 2022 129th CedricGebistorf 852 61 11ms 18 Feb 2022 129th jascotm 852 61 11ms 17 May 2022 129th Eilonlif 🇮🇱 852 61 31ms 9 Sep 2022 129th vishwathg 852 61 20ms 18 Sep 2022 129th ZakkkkAttackkkk 🇵🇭 852 61 12ms 19 Aug 2023 129th jtaxen 852 61 11ms 26 Mar 2024 129th ahmetdemirag 🇨🇾 852 61 19ms 5 Nov 2024 129th Pyroan 852 61 12ms 16 Mar 2025 129th tri1212 🇻🇳 852 61 11ms 16 Apr 2025 141st vezzick 839 62 13ms 12 Mar 2021 141st schachmattmatt 839 62 11ms 18 Aug 2021 141st cooljoseph1 839 62 23ms 6 May 2022 141st fredrik-bakke 🇳🇴 839 62 19ms 29 Sep 2022 141st nkoppel 839 62 11ms 19 Oct 2022 141st AodhanDalton 839 62 11ms 4 Nov 2022 141st nstearns96 🇬🇧 839 62 17ms 28 Nov 2022 141st adamnielson42 🇺🇸 839 62 11ms 10 Jan 2024 141st jbjd 839 62 11ms 2 Mar 2024 141st wh3n3v3r 🇨🇿 839 62 11ms 12 Nov 2024 141st jacekwladzinski 839 62 13ms 4 Oct 2025 141st Mabeloid 🇳🇴 839 62 11ms 26 Oct 2025 153rd apourchot 825 63 18ms 13 Feb 2021 153rd neihousaigaai 825 63 10ms 10 Apr 2021 153rd lechevalier 825 63 10ms 9 Aug 2021 153rd yzhs 🇩🇪 825 63 11ms 7 Jun 2022 153rd commandz0 🇺🇸 825 63 13ms 19 Sep 2022 153rd fourth-bit 825 63 11ms 21 Nov 2022 153rd FortuiteMan 🇫🇷 825 63 31ms 8 Sep 2023 153rd ssbhatt4321 825 63 27ms 14 Oct 2023 First Prev 81–160 of 322 Next Last