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?
Arrows 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 321st 5quiwyrm 219 338 12ms 2 Sep 2025 322nd ramsay 214 345 14ms 9 Aug 2022 323rd Pale-Vessel 214 346 14ms 19 Dec 2023 324th johnellis1392 211 350 14ms 6 Jan 2024 325th Bit125 210 352 15ms 31 Jan 2024 326th Shotokhan 209 354 14ms 18 Sep 2025 327th dillon-duncando 204 363 13ms 26 Nov 2021 328th atazzam 🇺🇸 203 365 14ms 4 Apr 2022 329th Bananapants22 191 387 13ms 15 Aug 2022 330th AKASme 190 390 13ms 6 Apr 2025 331st eddvrs 189 391 15ms 21 Dec 2023 332nd ItsMeNoobieboy 187 395 14ms 23 Dec 2022 332nd HaiPaul 187 395 14ms 6 Mar 2024 334th murugan-k-0204 186 397 15ms 7 Oct 2022 335th EnisEfe0 185 399 14ms 13 Jun 2025 336th feherd 185 400 15ms 18 Apr 2022 337th CutSandstone 185 401 11ms 4 Jul 2024 338th RoscoeSmith 183 405 15ms 14 Sep 2022 338th TheLazySquid 183 405 15ms 22 Dec 2022 340th halp1 182 407 15ms 19 Apr 2022 341st sciencejiho 181 408 15ms 17 Oct 2024 341st muser-logiccpu 🇺🇦 181 408 11ms 23 Aug 2025 343rd bthalheim 181 409 14ms 12 Sep 2022 344th NoneTheFewer 180 411 11ms 26 Dec 2025 345th croc54 178 415 13ms 23 Dec 2024 346th UriyaBA 176 420 14ms 25 Aug 2022 347th Thonoton 175 424 14ms 16 Mar 2023 348th jbrry 170 435 15ms 4 Jul 2022 348th omero-san 170 435 13ms 18 Sep 2025 350th zwxzwxzwx21 169 438 14ms 15 Jan 2024 351st amende14 167 444 11ms 2 Aug 2023 352nd jusaka 166 447 11ms 10 days ago 353rd Brain-Boy-53 158 468 14ms 27 Jun 2024 354th KatieLG-Transpiler 🇬🇧 152 486 15ms 25 Jun 2022 355th jsvizcaino 148 499 15ms 3 Nov 2022 356th arjunarya1 147 505 12ms 28 Aug 2025 357th RobertBurs 144 514 15ms 18 Sep 2025 358th kevinnaviapaiva 143 518 10ms 12 Feb 2025 359th iamgamja 130 568 16ms 21 Mar 2023 360th MichaelClasby0 🇬🇧 125 590 15ms 16 Oct 2023 361st venkatesh1220 125 591 15ms 7 Oct 2022 362nd joshuamkite 117 635 16ms 20 Aug 2023 363rd sayloren 113 653 14ms 25 Feb 2023 364th fl3ur1nestimable 111 665 15ms 28 Mar 2022 365th dahappy1989 106 701 14ms 5 Nov 2023 366th Zhenyu-Bo 101 730 13ms 30 Jul 2025 367th Tasbia 89 827 11ms 28 Aug 2024 368th AidanWalter 69 1,068 15ms 3 Jan 2025 First Prev 321–368 of 368
