The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Musical Chords in all languages 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 161st primo-ppcg 🇹🇭 722 154 11ms 20 Nov 2021 162nd ryyyn 🇺🇸 717 155 35ms 28 Oct 2025 163rd stefangimmillaro 716 110 34ms 26 Dec 2024 164th sean-niemann 🇺🇸 716 134 664ms 5 Feb 2026 165th nwellnhof 🇩🇪 716 262 303ms 4 Nov 2021 166th Yax42 🇫🇷 715 150 444ms 20 Aug 2025 167th albanian-laundromat 712 131 910ms 13 Nov 2025 168th emplv 🇱🇻 707 265 298ms 19 Apr 2023 169th Lv0Sys 🇵🇱 705 266 282ms 24 days ago 170th andersk 🇺🇸 698 246 249ms 5 Nov 2022 171st nwellnhof 🇩🇪 697 113 40ms 3 Nov 2021 172nd stefangimmillaro 695 208 465ms 6 Oct 2025 173rd blaztoma 🇱🇹 694 333 42ms 25 Dec 2025 174th primo-ppcg 🇹🇭 689 190 5ms 3 Jul 2023 175th SirBogman 🇺🇸 687 106 4ms 11 Mar 2022 176th lifthrasiir 🇰🇷 685 73 3ms 6 Dec 2024 177th stefangimmillaro 685 209 152ms 13 Nov 2023 178th nwellnhof 🇩🇪 684 162 9ms 8 Jul 2022 179th lifthrasiir 🇰🇷 682 163 33ms 19 Nov 2024 180th bitsandbeyond 🇳🇱 678 164 11ms 11 Nov 2025 181st bitsandbeyond 🇳🇱 675 214 500ms 11 Nov 2025 182nd kg583 🇺🇸 674 165 31ms 15 Jul 2024 183rd emgordon154 673 222 17ms 26 Oct 2025 184th nwellnhof 🇩🇪 671 133 417ms 4 Nov 2021 185th nwellnhof 🇩🇪 668 109 3ms 13 Nov 2021 186th jared-hughes 667 166 10ms 11 Apr 2022 186th Yax42 🇫🇷 667 166 11ms 6 Sep 2025 188th stefangimmillaro 667 315 47ms 26 Apr 2025 189th CornerMercury 🇬🇧 666 167 32ms 31 Dec 2025 190th stefangimmillaro 666 189 115ms 24 May 2024 191st primo-ppcg 🇹🇭 664 213 244ms 27 Nov 2021 192nd inventshah 662 168 19ms 14 Nov 2022 193rd antimon2 🇯🇵 660 123 566ms 9 Nov 2021 194th emgordon154 659 149 2,700ms 26 Oct 2025 195th lifthrasiir 🇰🇷 657 146 541ms 2 Dec 2024 196th stefangimmillaro 654 170 11ms 19 Dec 2022 197th nwellnhof 🇩🇪 651 116 34ms 4 Nov 2021 198th stefangimmillaro 651 126 1,216ms 13 Nov 2023 199th kg583 🇺🇸 649 148 574ms 28 Jul 2024 200th nwellnhof 🇩🇪 648 187 2ms 4 Nov 2021 201st Flekay 🇩🇪 639 174 12ms 19 Feb 2026 201st snoozingnewt 🇨🇦 639 174 11ms 20 Feb 2026 203rd NewDefectus 🇮🇱 635 175 20ms 25 Nov 2021 204th emgordon154 628 177 16ms 26 Oct 2025 205th lynn 627 249 3ms 9 Nov 2021 206th Lv0Sys 🇵🇱 625 177 14ms 24 days ago 207th nwellnhof 🇩🇪 624 172 428ms 21 Nov 2021 208th tayloia 🇬🇧 622 178 12ms 23 May 2023 209th GolfingSuccess 🇬🇷 621 179 11ms 25 Nov 2021 210th albanian-laundromat 618 180 13ms 6 Nov 2025 210th anter69 🇭🇺 618 180 12ms 4 Dec 2025 210th Lv0Sys 🇵🇱 618 180 19ms 24 days ago 213th stefangimmillaro 618 278 312ms 26 Nov 2024 214th AdrienHache 🇫🇷 616 174 477ms 20 Aug 2025 215th jared-hughes 614 181 20ms 11 Apr 2022 216th MeWhenI 🇻🇦 613 306 281ms 6 Jun 2023 217th emgordon154 608 158 528ms 26 Oct 2025 218th itsh01 608 182 12ms 25 May 2022 219th LostSyntax21 🇬🇧 608 183 20ms 17 days ago 220th inventshah 604 159 596ms 22 Jan 2024 221st SirBogman 🇺🇸 603 251 72ms 27 Jan 2023 222nd orthoplex 🇨🇽 601 185 11ms 3 Nov 2021 223rd primo-ppcg 🇹🇭 601 219 8ms 22 May 2023 224th Waffle3z 601 260 4ms 9 Nov 2021 225th Kacarott 🇦🇺 598 236 68ms 24 Nov 2025 226th Irratix 🇳🇱 595 186 14ms 24 Jun 2022 227th bitsandbeyond 🇳🇱 593 181 432ms 11 Nov 2025 228th jared-hughes 592 256 447ms 17 Jul 2022 229th janlelis 588 134 41ms 4 Nov 2021 230th plcc0 588 189 33ms 10 Feb 2026 231st albanian-laundromat 582 165 543ms 6 Nov 2025 232nd stefangimmillaro 581 169 2,635ms 26 Nov 2024 233rd anter69 🇭🇺 579 136 38ms 4 Dec 2025 234th CatsAreFluffy 579 226 54ms 12 Jan 2023 235th snoozingnewt 🇨🇦 578 166 527ms 20 Feb 2026 236th roguh 🇬🇹 573 194 12ms 18 Oct 2024 237th annaproxy 573 364 21ms 22 Sep 2023 238th jared-hughes 571 138 41ms 12 Sep 2022 238th bitsandbeyond 🇳🇱 571 138 36ms 11 Nov 2025 240th stefangimmillaro 570 188 434ms 10 Apr 2025 First Prev 161–240 of 631 Next Last