The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Arrows 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 241st Shanethegamer 🇺🇸 842 130 72ms 12 Jan 2022 241st m-tkach 🇺🇦 842 130 68ms 25 Aug 2023 243rd sean-niemann 🇺🇸 842 150 4ms 8 Oct 2024 244th tomtheisen 🇺🇸 841 114 515ms 10 Feb 2025 244th stefangimmillaro 841 114 501ms 10 Apr 2025 246th JayXon 🇺🇸 841 195 2,391ms 14 Sep 2025 247th pfgithub 840 101 13ms 14 May 2023 248th primo-ppcg 🇹🇭 840 122 94ms 15 Oct 2023 249th edsrzf 🇳🇿 840 144 196ms 19 Feb 2026 250th ovs-code 🇩🇪 840 177 159ms 7 Jul 2024 251st MeWhenI 🇻🇦 838 146 34ms 29 Nov 2022 252nd MeWhenI 🇻🇦 837 82 47ms 18 Aug 2022 252nd sean-niemann 🇺🇸 837 82 53ms 26 Jul 2024 254th duckyluuk 🇳🇱 837 114 14ms 15 Jul 2024 254th ryyyn 🇺🇸 837 114 11ms 13 Jan 2026 256th m-tkach 🇺🇦 837 155 38ms 12 Jan 2024 257th sean-niemann 🇺🇸 836 101 173ms 19 Feb 2025 258th sean-niemann 🇺🇸 836 103 2ms 8 Jul 2025 259th lynn 836 168 6ms 15 Sep 2021 260th andersk 🇺🇸 835 163 183ms 1 Nov 2022 261st Steffan153 🇫🇮 835 178 170ms 3 Jun 2024 262nd primo-ppcg 🇹🇭 835 296 12ms 21 May 2025 263rd Shanethegamer 🇺🇸 834 128 425ms 28 Nov 2022 264th Shanethegamer 🇺🇸 834 135 676ms 24 Sep 2025 265th emgordon154 834 145 170ms 3 Dec 2025 266th jared-hughes 832 102 14ms 22 Apr 2022 266th 13x1 🇩🇪 832 102 13ms 14 May 2023 268th emplv 🇱🇻 830 111 149ms 6 Dec 2022 269th GrayJoKing 🇦🇺 830 115 48ms 7 Jul 2023 270th GrayJoKing 🇦🇺 830 156 128ms 29 May 2022 271st Shanethegamer 🇺🇸 827 83 37ms 27 Aug 2021 271st anter69 🇭🇺 827 83 36ms 20 days ago 273rd anter69 🇭🇺 827 92 1,944ms 20 days ago 274th MWI-polygolf 827 129 435ms 6 Dec 2023 275th Shanethegamer 🇺🇸 827 297 1,895ms 11 Apr 2025 276th canissimia 🇦🇶 825 326 10ms 24 Nov 2023 277th MeWhenI 🇻🇦 824 199 2,007ms 7 Nov 2025 278th MeWhenI 🇻🇦 823 103 12ms 25 Nov 2022 278th tayloia 🇬🇧 823 103 15ms 5 Jun 2023 278th prplz 🇦🇺 823 103 13ms 30 Jan 2024 281st MeWhenI 🇻🇦 822 154 41ms 29 Apr 2025 282nd Shanethegamer 🇺🇸 821 114 2ms 28 Nov 2022 282nd Waffle3z 821 114 3ms 14 Dec 2022 284th MeWhenI 🇻🇦 821 137 823ms 7 Nov 2025 285th lynn 821 158 33ms 11 Jul 2023 285th Shanethegamer 🇺🇸 821 158 38ms 10 Feb 2026 287th Shanethegamer 🇺🇸 820 154 3ms 18 Jan 2023 288th Shanethegamer 🇺🇸 818 93 2,049ms 27 Aug 2021 288th stefangimmillaro 818 93 2,034ms 30 Jul 2022 288th MeWhenI 🇻🇦 818 93 1,929ms 13 Nov 2022 291st MeWhenI 🇻🇦 818 127 10ms 29 Dec 2024 292nd MeWhenI 🇻🇦 817 125 540ms 4 Mar 2022 293rd jared-hughes 817 301 11ms 8 Jul 2024 294th MeWhenI 🇻🇦 816 137 146ms 25 Dec 2022 295th SirBogman 🇺🇸 815 70 208ms 8 Oct 2021 296th SirBogman 🇺🇸 815 117 14ms 29 Jan 2024 296th davecame 815 117 14ms 27 Feb 2024 296th bizy-coder 815 117 10ms 10 Dec 2025 299th Shanethegamer 🇺🇸 815 160 9ms 24 Jan 2024 300th jared-hughes 814 94 11ms 22 Apr 2022 301st MeWhenI 🇻🇦 812 106 2ms 5 Jul 2024 302nd snoozingnewt 🇨🇦 811 149 184ms 28 Feb 2026 303rd stefangimmillaro 810 139 853ms 6 Oct 2025 304th MeWhenI 🇻🇦 809 99 7ms 28 May 2023 305th GrayJoKing 🇦🇺 809 110 4ms 7 Sep 2024 306th primo-ppcg 🇹🇭 809 118 39ms 24 Jun 2022 307th stefangimmillaro 809 158 384ms 16 Jun 2023 308th Irratix 🇳🇱 808 105 13ms 8 Dec 2022 308th rucin93 🇵🇱 808 105 13ms 16 Jul 2024 310th MeWhenI 🇻🇦 808 109 7ms 12 Nov 2022 311th MeWhenI 🇻🇦 808 304 1,919ms 28 Mar 2025 312th Shanethegamer 🇺🇸 805 152 28ms 7 Jul 2022 313th duckyluuk 🇳🇱 804 104 535ms 15 Jul 2024 313th lifthrasiir 🇰🇷 804 104 528ms 2 Dec 2024 315th Steffan153 🇫🇮 803 187 82ms 8 days ago 316th nwellnhof 🇩🇪 801 77 47ms 25 Sep 2021 317th Kacarott 🇦🇺 801 128 85ms 9 Dec 2025 318th edsrzf 🇳🇿 801 162 32ms 20 Feb 2026 319th stefangimmillaro 798 140 133ms 30 Sep 2023 320th retrohun 797 96 17ms 31 Jan 2026 First Prev 241–320 of 1,320 Next Last