The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Day of Week 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 81st yzhs 🇩🇪 977 87 14ms 22 Jun 2023 81st NewDefectus 🇮🇱 977 87 14ms 19 Aug 2023 81st Emutis 🇱🇹 977 87 15ms 7 Dec 2025 84th FlorianCassayre 🇫🇷 955 89 14ms 24 Sep 2023 85th btjones0 944 90 15ms 2 May 2023 86th scpchicken 🇵🇼 934 91 37ms 16 Apr 2023 86th anter69 🇭🇺 934 91 22ms 17 Apr 2023 86th stefangimmillaro 934 91 20ms 20 Apr 2023 86th Alex-x90 🇺🇸 934 91 21ms 15 May 2023 86th AlexanderFair 934 91 22ms 11 Jul 2023 86th orthoplex 🇨🇽 934 91 22ms 3 Oct 2023 86th Ralac07 🇦🇺 934 91 22ms 11 Jun 2024 86th EnTerr 934 91 22ms 8 Sep 2024 86th Pyroan 934 91 20ms 16 Apr 2025 86th bknower 934 91 21ms 27 Jun 2025 86th luuumine 🇫🇷 934 91 21ms 3 Nov 2025 86th plcc0 934 91 22ms 11 Jan 2026 86th dgambit 934 91 23ms 20 Jan 2026 99th damoc1es 924 92 14ms 16 Apr 2023 99th celiendonze 🇨🇭 924 92 15ms 17 Apr 2023 99th CarsonChr 🇺🇸 924 92 15ms 20 Apr 2023 99th klixel 🇨🇦 924 92 15ms 16 May 2023 99th kyleclaassen 924 92 14ms 24 May 2023 99th b10011 🇫🇮 924 92 14ms 12 Jun 2023 99th rollershutter 924 92 14ms 20 Jun 2023 99th fkantelberg 924 92 15ms 14 Jul 2023 99th RomanHauksson 924 92 15ms 20 Jul 2023 99th cros107 🇦🇺 924 92 14ms 18 Aug 2023 99th Mikey-Beep 🇬🇧 924 92 13ms 25 Aug 2023 99th m42km 924 92 23ms 13 Nov 2023 99th knutae 🇳🇴 924 92 23ms 13 Nov 2023 99th cubed-guy 924 92 14ms 6 Dec 2023 99th andrewjc2000 924 92 14ms 10 Feb 2024 99th RJFuller 924 92 34ms 19 Mar 2024 99th neel11235813 924 92 13ms 28 Mar 2024 99th leon-w 924 92 15ms 24 Jul 2024 99th ziselsberger 924 92 35ms 8 Oct 2024 99th croc54 924 92 15ms 29 Dec 2024 99th Troon 924 92 14ms 12 Mar 2025 99th albanian-laundromat 924 92 13ms 28 Jun 2025 99th mathieurodic 924 92 13ms 21 Oct 2025 99th retrohun 924 92 13ms 6 Nov 2025 99th jared-hughes 924 92 14ms 21 Dec 2025 99th josev814 924 92 14ms 21 Jan 2026 99th rustykitty 🇺🇸 924 92 14ms 5 Feb 2026 99th JOrE20 924 92 13ms 27 Feb 2026 127th dezconnect 914 93 14ms 26 Jun 2023 127th arjunprakash027 914 93 23ms 8 Aug 2025 127th butnaruteodor 914 93 14ms 31 Oct 2025 130th hellwue 904 94 33ms 28 Apr 2023 130th eiburns 904 94 35ms 28 Apr 2023 130th jmerle 🇳🇱 904 94 14ms 15 Jun 2023 130th Vaekor 904 94 14ms 9 Jul 2023 130th anonymaew 904 94 14ms 19 Aug 2023 130th epic-programmer-guy 904 94 14ms 21 Dec 2023 130th Jaydosu 904 94 15ms 28 Jun 2024 130th Schreipfelerer 904 94 14ms 11 Sep 2024 130th sheeperino 🇮🇹 904 94 15ms 12 Oct 2024 130th Europe2048 904 94 13ms 30 Nov 2024 130th Artemis21 🇬🇧 904 94 15ms 2 Jan 2025 130th lelbal 904 94 13ms 6 Nov 2025 130th denkyuu1 904 94 14ms 7 Feb 2026 143rd guilhem-roy 🇫🇷 895 95 22ms 20 Jun 2023 143rd jamopher 895 95 22ms 6 Nov 2023 145th Poehavshi 885 96 14ms 26 Jun 2023 145th kurkale6ka 885 96 14ms 19 Nov 2023 145th chartung17 885 96 15ms 17 Dec 2023 145th jbjd 885 96 15ms 19 Feb 2024 145th msrawsonwork 885 96 15ms 1 Mar 2024 145th Grrisly 885 96 16ms 25 Mar 2024 145th yuchuehw 885 96 13ms 13 May 2024 145th tomh1012 885 96 13ms 20 Feb 2026 153rd juliusgeo 876 97 24ms 19 Apr 2023 153rd Just4FunCoder 876 97 14ms 27 Oct 2023 153rd Aquateraneal 🇺🇸 876 97 19ms 21 days ago 156th ssbhatt4321 867 98 14ms 11 Jun 2023 156th tayacrystals 867 98 14ms 18 Nov 2023 156th hiichbindermax 867 98 14ms 27 Jul 2024 156th jatloe 867 98 14ms 23 Oct 2024 156th 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