The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Morse Encoder in all languages 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 160th TFeld00 🇩🇰 825 113 10ms 18 Nov 2020 160th DialFrost 🇸🇬 825 113 17ms 15 Jan 2023 163rd sean-niemann 🇺🇸 825 168 628ms 24 Sep 2025 164th btnlq 824 112 310ms 30 Dec 2020 165th CLOStrophobic 🇮🇹 822 184 6ms 23 May 2025 166th Bubbler-4 821 134 35ms 10 Dec 2021 167th sean-niemann 🇺🇸 819 138 5ms 24 Aug 2025 168th Irratix 🇳🇱 818 114 12ms 7 May 2022 168th CornerMercury 🇬🇧 818 114 17ms 22 Dec 2025 170th SirBogman 🇺🇸 817 113 320ms 27 Jan 2024 171st dokutan 815 106 454ms 11 days ago 172nd SirBogman 🇺🇸 815 135 33ms 28 Nov 2023 173rd lifthrasiir 🇰🇷 815 331 8ms 12 Dec 2024 174th Bubbler-4 814 88 3ms 24 Feb 2022 175th anter69 🇭🇺 814 99 33ms 17 Jan 2023 176th MeWhenI 🇻🇦 813 130 3ms 15 Feb 2025 177th MeWhenI 🇻🇦 812 153 9ms 9 May 2024 178th GolfingSuccess 🇬🇷 811 115 11ms 10 Oct 2020 179th rucin93 🇵🇱 811 171 411ms 24 Sep 2025 180th GolfingSuccess 🇬🇷 807 107 472ms 25 Jan 2025 180th snoozingnewt 🇨🇦 807 107 403ms 17 Feb 2026 182nd inventshah 807 168 442ms 20 May 2025 183rd KatieLG 🇬🇧 804 116 10ms 11 Dec 2022 184th ovs-code 🇩🇪 804 150 2ms 18 Oct 2024 185th leon-w 797 117 21ms 5 Jan 2019 186th ETHproductions 🇺🇸 796 137 11ms 27 Apr 2018 187th lynn 796 179 1,022ms 23 Jul 2021 188th MeWhenI 🇻🇦 794 207 3ms 29 Jul 2023 189th adyache 🇺🇸 793 214 7ms 30 Jun 2023 190th AlephSquirrel 792 191 5ms 24 Oct 2024 191st MeWhenI 🇻🇦 791 204 321ms 8 Feb 2023 192nd primo-ppcg 🇹🇭 790 129 1,603ms 5 Dec 2021 193rd lynn 789 216 188ms 1 May 2022 194th marshallward 🇺🇸 788 228 41ms 7 May 2025 195th potatoattack 787 205 343ms 22 Apr 2020 196th Waffle3z 786 188 2ms 8 Apr 2022 197th emgordon154 785 110 438ms 4 Sep 2025 198th MeWhenI 🇻🇦 783 154 2ms 5 Jul 2024 199th ReidZ3 🇺🇸 779 230 123ms 2 Dec 2020 200th kumavale 778 219 152ms 8 Sep 2025 201st FlorianCassayre 🇫🇷 777 120 10ms 18 Sep 2023 202nd UnderKoen 🇳🇱 777 340 2ms 9 Jul 2024 203rd SirBogman 🇺🇸 775 104 38ms 27 Jan 2024 204th j-Ewan 771 121 17ms 1 Feb 2022 205th JayXon 🇺🇸 770 89 3ms 28 Aug 2021 206th MeWhenI 🇻🇦 770 198 419ms 27 Jul 2024 207th MeWhenI 🇻🇦 770 202 2ms 10 Sep 2022 208th MeWhenI 🇻🇦 767 188 40ms 17 Feb 2023 209th ovs-code 🇩🇪 766 187 113ms 24 Sep 2023 210th user189032 766 234 124ms 29 May 2019 211th GrayJoKing 🇦🇺 764 113 434ms 23 Jul 2024 212th rambox11 762 143 15ms 6 Dec 2019 213th Steffan153 🇫🇮 761 140 433ms 24 Feb 2023 213th sean-niemann 🇺🇸 761 140 398ms 2 Nov 2023 215th frankgraziano 757 170 11ms 19 Feb 2026 216th SirBogman 🇺🇸 754 95 3ms 8 Nov 2023 216th lifthrasiir 🇰🇷 754 95 3ms 4 Dec 2024 218th Irratix 🇳🇱 754 160 2ms 25 Feb 2022 219th olivermrose 🇺🇸 753 107 64ms 4 Feb 2022 220th edre 752 124 10ms 30 Apr 2018 221st snoozingnewt 🇨🇦 752 199 122ms 25 days ago 222nd MeWhenI 🇻🇦 747 146 10ms 1 Mar 2022 223rd andersk 🇺🇸 747 228 149ms 5 Jan 2020 224th lynn 746 235 29ms 6 Aug 2023 225th KatieLG 🇬🇧 745 116 401ms 28 Oct 2024 226th elgan65536 🇺🇸 744 229 231ms 12 Feb 2026 227th albanian-laundromat 740 130 1,246ms 26 Oct 2025 228th namelessiw 740 144 401ms 29 Jul 2024 229th MarcMush 🇫🇷 739 118 1,249ms 11 Jan 2024 230th lynn 738 204 1,382ms 27 Oct 2021 231st Irratix 🇳🇱 737 184 550ms 3 Aug 2023 232nd ndren 734 127 11ms 3 Aug 2025 233rd tayloia 🇬🇧 732 149 11ms 17 Jan 2023 234th nwellnhof 🇩🇪 731 154 7ms 12 Jul 2022 235th MeWhenI 🇻🇦 730 190 563ms 7 Nov 2025 236th timvermeulen 725 235 145ms 5 Jan 2020 237th jared-hughes 724 204 2ms 17 Jul 2022 238th dokutan 724 210 3ms 26 Dec 2025 239th albanian-laundromat 723 129 10ms 6 Nov 2025 240th mrxz 🇳🇱 722 151 12ms 27 Jun 2019 First Prev 161–240 of 1,003 Next Last
