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?
12 Days of Christmas in Python 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 1st hellopir2 1,000 190 2,167ms 12 hours ago 2nd JayXon 🇺🇸 995 191 16ms 14 Apr 2023 2nd duckyluuk 🇳🇱 995 191 16ms 3 Jul 2025 4th btnlq 990 192 17ms 11 Oct 2020 4th hallvabo 🇳🇴 990 192 18ms 2 Jun 2021 6th sunleonid 984 193 18ms 3 Jan 2026 7th primo-ppcg 🇹🇭 974 195 16ms 21 Dec 2020 7th pardouin 🇫🇷 974 195 17ms 14 Jul 2024 9th BlankSpruce 964 197 16ms 3 Jan 2022 10th FoxInTheClouds 960 198 17ms 12 days ago 11th m-tkach 🇺🇦 955 199 17ms 27 Apr 2022 11th GrayJoKing 🇦🇺 955 199 17ms 5 Jun 2022 11th snoozingnewt 🇨🇦 955 199 17ms 23 Nov 2025 14th kg583 🇺🇸 950 200 16ms 10 Aug 2023 14th minhtrancccp 950 200 16ms 11 Oct 2023 14th lifthrasiir 🇰🇷 950 200 30ms 16 Nov 2024 17th shelerr 945 201 17ms 2 Jul 2022 17th sean-niemann 🇺🇸 945 201 16ms 2 Jan 2024 17th plcc0 945 201 15ms 31 Jan 2026 20th Shanethegamer 🇺🇸 941 202 17ms 11 Mar 2022 20th neel11235813 941 202 17ms 14 Feb 2023 22nd RYNO8 936 203 18ms 29 Aug 2021 22nd dscholtz-lab49 936 203 17ms 24 May 2023 22nd idavidka 🇭🇺 936 203 17ms 25 May 2023 22nd sudhackar 936 203 17ms 26 Feb 2026 26th DialFrost 🇸🇬 931 204 17ms 9 Feb 2023 26th apreg 931 204 16ms 31 May 2023 26th anter69 🇭🇺 931 204 16ms 20 Nov 2023 26th ndren 931 204 17ms 29 Dec 2023 26th SirBogman 🇺🇸 931 204 20ms 23 Jan 2024 26th albanian-laundromat 931 204 17ms 29 Mar 2025 26th emgordon154 931 204 17ms 14 Apr 2025 26th AnAwesomGuy 931 204 16ms 21 Dec 2025 34th commandz0 🇺🇸 927 205 17ms 22 Aug 2023 34th SB-945 927 205 17ms 17 Apr 2024 34th InigoK 🇺🇸 927 205 16ms 14 Aug 2025 34th qpwoeirut 927 205 18ms 2 Oct 2025 38th prplz 🇦🇺 922 206 17ms 19 Oct 2019 38th jmerle 🇳🇱 922 206 16ms 22 Jun 2023 38th 2011-Chan-Ethan 922 206 17ms 9 Jul 2023 38th dokutan 922 206 17ms 21 Mar 2025 38th Mukundan314 922 206 16ms 29 Jun 2025 38th CornerMercury 🇬🇧 922 206 17ms 22 Dec 2025 44th m42km 918 207 17ms 4 Feb 2024 44th abhishekg999 918 207 17ms 21 Sep 2024 46th FlorianCassayre 🇫🇷 909 209 17ms 18 Sep 2023 46th Openstreetmapler 909 209 17ms 6 May 2025 48th Baroniket 905 210 17ms 13 Aug 2025 48th robin-scragg 905 210 16ms 20 Sep 2025 48th vhoulbreque 🇫🇷 905 210 18ms 30 Nov 2025 51st Yewzir 🇧🇪 900 211 16ms 7 Oct 2023 52nd wh3n3v3r 🇨🇿 896 212 17ms 7 Nov 2024 53rd JunkIce 892 213 10ms 29 Mar 2025 53rd Matter1024 🇮🇳 892 213 17ms 8 days ago 55th JOrE20 888 214 15ms 24 Feb 2026 56th btjones0 884 215 19ms 15 Jul 2022 56th Artemis21 🇬🇧 884 215 17ms 3 Jan 2025 58th QuincyNash 🇺🇸 880 216 17ms 18 Jan 2022 59th edre 876 217 10ms 18 May 2018 60th Lydxn 🇨🇦 872 218 10ms 6 Jan 2021 61st jhu04 856 222 11ms 7 Jul 2022 62nd keelimeguy 🇺🇸 833 228 38ms 17 Dec 2023 63rd snydej 830 229 15ms 29 Dec 2024 63rd Flekay 🇩🇪 830 229 10ms 15 Feb 2026 65th Steffan153 🇫🇮 802 237 30ms 21 Feb 2026 66th kacogg5 798 238 10ms 9 Jul 2022 67th MeWhenI 🇻🇦 766 248 10ms 28 Oct 2021 68th TFeld00 🇩🇰 757 251 17ms 4 Nov 2020 68th ovs-code 🇩🇪 757 251 11ms 23 Oct 2021 68th blaztoma 🇱🇹 757 251 10ms 5 Oct 2025 71st orthoplex 🇨🇽 754 252 11ms 9 Oct 2022 72nd Irratix 🇳🇱 751 253 11ms 7 May 2022 73rd Attero 🇸🇪 748 254 29ms 25 Sep 2020 73rd GolfingSuccess 🇬🇷 748 254 10ms 29 Oct 2020 75th lucasvazq 🇦🇷 745 255 10ms 20 Mar 2022 75th jz268 745 255 10ms 6 Jul 2022 77th ludwig-n 742 256 9ms 7 Apr 2021 77th inventshah 742 256 13ms 24 Jan 2023 79th andersk 🇺🇸 739 257 10ms 26 Mar 2020 79th Fishron 739 257 10ms 28 Dec 2021 1–80 of 1,169 Next Last
