The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 721st RatajVaver 361 529 10ms 13 May 2019 721st henryishuman 361 529 10ms 23 May 2020 721st phpboyscout 361 529 10ms 5 Jan 2021 721st HorseScary 361 529 10ms 16 Nov 2021 721st lokesh1809 361 529 10ms 3 Dec 2021 726th scottJsonar 360 530 10ms 29 Nov 2019 726th WillowBee7 360 530 10ms 16 Sep 2020 726th jjgry 360 530 10ms 5 Nov 2020 726th GulgDev 360 530 10ms 21 Mar 2023 726th joshua-el-samalouti 🇩🇪 360 530 10ms 26 May 2024 726th jameswmccarty 360 530 10ms 11 Jul 2024 726th SOONwasTaken 360 530 9ms 18 Mar 2025 726th brandongumby 360 530 10ms 8 Jun 2025 726th abhinavuppala 360 530 10ms 12 days ago 735th bwat2 360 531 9ms 27 Dec 2021 735th zyc-2024 🇨🇳 360 531 11ms 30 Dec 2025 735th BenMaydan 360 531 10ms 16 days ago 738th johnnythedoggie 359 532 10ms 31 Mar 2021 738th pecholsjones 359 532 9ms 8 Dec 2021 738th dzybine 359 532 11ms 7 Mar 2022 738th zlohner 359 532 10ms 6 Apr 2022 738th jsvizcaino 359 532 10ms 13 Dec 2022 738th buddyw 359 532 10ms 9 Mar 2023 738th r-i-c-e 359 532 9ms 8 Jul 2023 738th OllyTDev 359 532 9ms 22 Aug 2023 738th 123mjb 359 532 9ms 3 Jan 2024 738th YAJUE114514 359 532 10ms 24 Aug 2025 748th chanyoungs 358 533 10ms 3 Jun 2020 748th atazzam 🇺🇸 358 533 10ms 11 Feb 2023 748th Cynopolis 358 533 10ms 13 Oct 2023 751st david-wiles6 358 534 10ms 23 Jan 2020 751st thomashastings 358 534 11ms 15 Apr 2021 751st ethandhunt 358 534 10ms 20 Jul 2021 751st omri2001 358 534 10ms 22 Oct 2022 751st oceko 358 534 10ms 2 Jan 2023 756th newc0m 357 535 10ms 13 Dec 2018 756th TheMickeyMouse 357 535 10ms 31 Jul 2021 756th Alcancir 357 535 9ms 1 Feb 2022 756th jorisbertram 357 535 10ms 26 Aug 2022 756th sbyrne51 357 535 11ms 1 Oct 2022 756th ridingqwerty 🇺🇸 357 535 10ms 20 Aug 2023 762nd louisbosqui 356 536 10ms 28 Dec 2020 762nd riviere-lucas 356 536 10ms 28 Dec 2020 762nd Magii27 356 536 9ms 3 Dec 2021 762nd nullie 356 536 10ms 6 Jun 2022 762nd pizie11 356 536 9ms 25 Jun 2023 762nd totosuki 356 536 10ms 15 Apr 2024 762nd felicksLindgren 356 536 10ms 13 Sep 2024 762nd mailboxjpg 356 536 10ms 24 days ago 770th jotslo 🇬🇧 356 537 10ms 10 Jul 2019 770th minecire 356 537 10ms 20 Nov 2019 770th Niitrogen 356 537 10ms 18 Jan 2020 770th ianpoe 356 537 9ms 14 Mar 2020 770th pseudonam-gc 356 537 9ms 26 Oct 2022 770th DeaDvey 356 537 10ms 7 Jul 2023 776th Querinus 355 538 10ms 29 Nov 2022 776th luca1339 355 538 10ms 30 Mar 2024 776th UwUcifer 355 538 10ms 23 Jul 2025 779th quasar098 354 539 10ms 16 Mar 2022 779th ShiniGangrade 354 539 10ms 13 Jul 2022 779th eshilo-draper 354 539 10ms 11 Oct 2022 779th emmertgergo 354 539 10ms 12 May 2023 779th MatthewBarroso 354 539 10ms 19 Dec 2023 779th GarryYwl 354 539 10ms 21 Jul 2024 779th Ythaenagor 354 539 10ms 5 Aug 2024 779th idaflux 354 539 10ms 4 Jul 2025 779th wobblybits 354 539 16ms 14 Aug 2025 788th LukasFolwarczny 🇨🇿 354 540 9ms 17 Sep 2022 788th FK76exe 354 540 10ms 8 Oct 2022 788th casmint 354 540 10ms 16 Nov 2022 788th sgaltair 354 540 10ms 22 Feb 2023 788th jj4th 354 540 10ms 22 May 2023 788th eli-siegel 354 540 10ms 27 Jun 2023 788th Trusly 354 540 9ms 27 Feb 2024 795th connorwagner 353 541 10ms 26 Jun 2018 795th breakingtherabbit 353 541 9ms 14 Jun 2022 795th andre-lameirinhas 🇵🇹 353 541 15ms 12 Oct 2022 795th theonetruenerd 353 541 9ms 27 Aug 2024 799th JasonRaubenheimer 352 542 10ms 25 Nov 2023 799th smothest 352 542 10ms 29 Dec 2023 First Prev 721–800 of 1,167 Next Last
