The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 17 hours. Why not try and solve them ahead of time?
Musical Chords 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 1st HPWiz 🇳🇿 1,000 116 22ms 27 May 2024 1st 4atj 1,000 116 22ms 29 Jun 2025 1st JayXon 🇺🇸 1,000 116 22ms 12 Feb 2026 4th pardouin 🇫🇷 943 123 11ms 10 Jun 2024 5th ovs-code 🇩🇪 935 124 18ms 20 Jun 2025 6th lynn 913 127 19ms 18 Feb 2022 6th SirBogman 🇺🇸 913 127 17ms 30 Jan 2023 8th blaztoma 🇱🇹 885 131 11ms 5 days ago 9th Seek64 🇩🇪 879 132 18ms 5 Jun 2025 10th AlephSquirrel 859 135 11ms 31 Jan 2024 11th 5cw 🇺🇸 853 136 12ms 29 Apr 2024 12th hallvabo 🇳🇴 847 137 12ms 22 Mar 2022 13th Steffan153 🇫🇮 795 146 18ms 12 Feb 2026 14th sean-niemann 🇺🇸 784 148 19ms 5 Feb 2026 15th nwellnhof 🇩🇪 779 149 12ms 4 Nov 2021 16th bricknellj 768 151 17ms 23 May 2024 17th btnlq 763 152 13ms 4 Nov 2021 18th primo-ppcg 🇹🇭 753 154 11ms 20 Nov 2021 19th ryyyn 🇺🇸 748 155 35ms 28 Oct 2025 20th lifthrasiir 🇰🇷 712 163 33ms 19 Nov 2024 21st bitsandbeyond 🇳🇱 707 164 11ms 11 Nov 2025 22nd kg583 🇺🇸 703 165 31ms 15 Jul 2024 23rd CornerMercury 🇬🇧 695 167 32ms 31 Dec 2025 24th inventshah 690 168 19ms 14 Nov 2022 25th stefangimmillaro 682 170 11ms 19 Dec 2022 26th Flekay 🇩🇪 667 174 12ms 19 Feb 2026 26th snoozingnewt 🇨🇦 667 174 11ms 20 Feb 2026 26th aksyristos 667 174 11ms 2 days ago 29th NewDefectus 🇮🇱 663 175 20ms 25 Nov 2021 30th emgordon154 655 177 16ms 26 Oct 2025 31st GolfingSuccess 🇬🇷 648 179 11ms 25 Nov 2021 32nd albanian-laundromat 644 180 12ms 6 Nov 2025 32nd anter69 🇭🇺 644 180 12ms 4 Dec 2025 32nd Lv0Sys 🇵🇱 644 180 19ms 27 Feb 2026 35th jared-hughes 641 181 20ms 11 Apr 2022 36th LostSyntax21 🇬🇧 634 183 20ms 24 days ago 37th orthoplex 🇨🇽 627 185 11ms 3 Nov 2021 38th plcc0 614 189 33ms 10 Feb 2026 39th roguh 🇬🇹 598 194 12ms 18 Oct 2024 40th Sp3000 🇦🇺 595 195 12ms 20 Nov 2021 41st MeWhenI 🇻🇦 586 198 53ms 15 Apr 2025 42nd duckyluuk 🇳🇱 569 204 33ms 15 Jul 2024 43rd vishwathg 566 205 62ms 27 Sep 2022 44th KatieLG 🇬🇧 550 211 11ms 3 Oct 2025 45th ahmetdemirag 🇨🇾 545 213 12ms 25 Nov 2024 46th RYNO8 516 225 19ms 10 Nov 2021 47th InigoK 🇺🇸 509 228 28ms 23 Sep 2025 48th janbehrens 🇩🇪 502 231 12ms 17 Jun 2023 48th ZakkkkAttackkkk 🇵🇭 502 231 57ms 19 Feb 2025 48th ndren 502 231 12ms 26 Nov 2025 51st Pyroan 483 240 18ms 15 Mar 2025 52nd StefanHabel 🇨🇦 477 243 17ms 1 Mar 2026 53rd DialFrost 🇸🇬 472 246 19ms 20 May 2024 54th yzhs 🇩🇪 470 247 18ms 23 Jun 2023 54th neel11235813 470 247 21ms 24 Nov 2023 56th qpwoeirut 466 249 11ms 4 Oct 2025 57th prplz 🇦🇺 455 255 18ms 22 Oct 2023 58th commandz0 🇺🇸 451 257 12ms 8 Mar 2025 58th davecame 451 257 13ms 15 Oct 2025 60th MichalMarsalek 🇨🇿 443 262 13ms 5 Nov 2021 60th FortuiteMan 🇫🇷 443 262 19ms 1 Dec 2025 62nd jeff-at-tamer-dot-codes 🇺🇸 434 267 17ms 23 Aug 2023 63rd jakobkordez 🇸🇮 431 269 18ms 8 Nov 2022 64th HumanoidCPU 430 270 12ms 5 May 2025 65th Mabeloid 🇳🇴 425 273 12ms 10 Jun 2025 66th SB-945 410 283 12ms 11 Mar 2024 67th amollberg 🇸🇪 406 286 12ms 15 Jan 2022 67th guilhem-roy 🇫🇷 406 286 21ms 22 Jun 2023 69th jacklynnepenick 400 290 13ms 22 Feb 2022 69th annaproxy 400 290 19ms 25 Apr 2022 69th OllieBoyne 🇬🇧 400 290 15ms 21 Aug 2022 72nd mbittner20 399 291 12ms 8 Jul 2024 73rd madex 🇩🇪 389 298 12ms 32 hours ago 74th scpchicken 🇵🇼 385 301 59ms 20 Feb 2024 75th nullie 383 303 12ms 10 Jun 2022 76th knutae 🇳🇴 374 310 13ms 13 Nov 2021 77th dillon-duncando 373 311 19ms 3 Oct 2022 77th andrewjc2000 373 311 14ms 26 Aug 2025 79th croc54 368 315 19ms 15 Jan 2025 80th CaedenHarper 🇨🇦 366 317 32ms 12 Jan 2026 1–80 of 114 Next Last