The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 32 hours. Why not try and solve them ahead of time?
φ 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 320th nwellnhof 🇩🇪 908 37 49ms 18 Oct 2021 320th stefangimmillaro 908 37 747ms 27 Dec 2024 320th ovs-code 🇩🇪 908 37 447ms 27 Dec 2024 320th primo-ppcg 🇹🇭 908 37 226ms 6 Jan 2025 325th ovs-code 🇩🇪 907 58 1,622ms 13 Jun 2025 326th stefangimmillaro 906 58 1,329ms 14 Oct 2025 327th andersk 🇺🇸 905 33 54ms 4 Mar 2023 327th Natanaelel 🇸🇪 905 33 55ms 4 Aug 2023 327th scpchicken 🇵🇼 905 33 53ms 4 Jul 2024 327th CaedenHarper 🇨🇦 905 33 54ms 10 Aug 2025 331st SirBogman 🇺🇸 904 27 1,763ms 26 Oct 2021 332nd Lydxn 🇨🇦 904 78 140ms 2 Mar 2023 333rd primo-ppcg 🇹🇭 904 111 6ms 24 Aug 2020 334th sisyphus-ppcg 🇦🇺 903 25 49ms 3 Mar 2022 334th MeWhenI 🇻🇦 903 25 49ms 2 May 2022 336th CornerMercury 🇬🇧 903 51 475ms 12 Oct 2025 337th janeclange 903 56 69ms 18 Nov 2023 337th namelessiw 903 56 28ms 28 Feb 2024 337th YAJUE114514 903 56 10ms 11 Dec 2025 340th JayXon 🇺🇸 903 80 563ms 12 Mar 2022 341st JayXon 🇺🇸 903 87 255ms 26 Sep 2023 342nd inventshah 903 116 1,196ms 23 Jul 2024 343rd primo-ppcg 🇹🇭 903 158 140ms 5 Apr 2025 344th MeWhenI 🇻🇦 902 52 56ms 25 Apr 2024 345th prplz 🇦🇺 902 53 30ms 25 Oct 2019 345th tomtheisen 🇺🇸 902 53 30ms 30 Sep 2020 345th nwellnhof 🇩🇪 902 53 25ms 31 Oct 2021 345th trinityy-7 902 53 33ms 1 Feb 2024 345th targrik 902 53 29ms 18 Feb 2025 345th Ultra814 902 53 31ms 26 Aug 2025 351st pardouin 🇫🇷 901 51 178ms 28 Feb 2025 352nd sean-niemann 🇺🇸 901 99 472ms 7 Aug 2023 353rd andersk 🇺🇸 900 63 121ms 21 Mar 2020 353rd JayXon 🇺🇸 900 63 126ms 28 Nov 2021 353rd Natanaelel 🇸🇪 900 63 127ms 23 Apr 2025 356th GrayJoKing 🇦🇺 899 56 137ms 29 May 2022 357th sisyphus-ppcg 🇦🇺 899 80 4,648ms 27 May 2024 358th dvargas46 🇺🇸 899 106 2,041ms 18 Mar 2023 359th lynn 898 65 1,298ms 30 Nov 2021 360th sean-niemann 🇺🇸 897 148 317ms 30 Dec 2024 361st sean-niemann 🇺🇸 895 92 282ms 25 Jun 2025 362nd primo-ppcg 🇹🇭 895 190 3,741ms 10 Mar 2023 363rd sean-niemann 🇺🇸 894 90 711ms 15 Jul 2025 364th guliyevemil1 🇦🇿 894 118 303ms 18 Apr 2020 364th primo-ppcg 🇹🇭 894 118 301ms 23 Apr 2020 364th Lydxn 🇨🇦 894 118 300ms 14 Jul 2021 364th stefangimmillaro 894 118 397ms 14 Nov 2023 364th fuzzylojik-golf 🇺🇸 894 118 304ms 3 Aug 2025 369th JayXon 🇺🇸 893 79 132ms 16 Oct 2022 369th Steffan153 🇫🇮 893 79 138ms 10 Apr 2023 369th sean-niemann 🇺🇸 893 79 135ms 23 Mar 2025 372nd primo-ppcg 🇹🇭 893 113 44ms 26 Apr 2025 373rd GrayJoKing 🇦🇺 893 146 726ms 2 Feb 2024 374th ovs-code 🇩🇪 892 81 578ms 16 Jun 2024 375th ovs-code 🇩🇪 892 100 462ms 27 Aug 2024 376th primo-ppcg 🇹🇭 891 107 653ms 6 Feb 2023 377th GrayJoKing 🇦🇺 888 42 95ms 15 Sep 2023 378th Lydxn 🇨🇦 888 51 180ms 9 Jan 2022 378th annaproxy 888 51 174ms 27 Oct 2023 378th sean-niemann 🇺🇸 888 51 181ms 25 Mar 2025 381st DialFrost 🇸🇬 888 119 254ms 29 Mar 2025 382nd primo-ppcg 🇹🇭 888 135 44ms 21 Jun 2022 383rd primo-ppcg 🇹🇭 888 163 1,933ms 3 Feb 2022 384th GrayJoKing 🇦🇺 887 42 3ms 5 Oct 2023 385th Constructor7 887 57 27ms 23 Feb 2018 385th programjames 887 57 54ms 6 May 2022 385th RDShah 887 57 41ms 8 May 2022 385th nullie 887 57 10ms 18 Jun 2022 385th LogicalJoe 887 57 10ms 6 Sep 2022 385th fkantelberg 887 57 39ms 6 Aug 2023 385th RYNO8 887 57 75ms 22 Aug 2023 385th jacobly0 🇺🇸 887 57 10ms 1 Sep 2023 385th Mr-McChicken 887 57 33ms 4 Oct 2025 385th solisolu 887 57 16ms 18 Nov 2025 395th Yewzir 🇧🇪 886 52 445ms 15 Jan 2024 395th DialFrost 🇸🇬 886 52 463ms 24 Jan 2024 397th Steffan153 🇫🇮 886 93 384ms 29 Aug 2024 398th sean-niemann 🇺🇸 886 107 246ms 15 Feb 2026 399th argusdusty 🇺🇸 886 119 284ms 26 Dec 2020 399th edsrzf 🇳🇿 886 119 304ms 26 Dec 2024 First Prev 321–400 of 2,495 Next Last