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?
𝑒 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 399th nwellnhof 🇩🇪 903 98 437ms 17 Jan 2022 399th JayXon 🇺🇸 903 98 412ms 20 Jun 2023 399th DialFrost 🇸🇬 903 98 405ms 22 Jul 2025 399th namelessiw 903 98 410ms 22 Jul 2025 405th GrayJoKing 🇦🇺 902 30 150ms 27 Jan 2021 406th marshallward 🇺🇸 902 98 42ms 28 Jun 2023 406th DialFrost 🇸🇬 902 98 52ms 26 Apr 2025 408th GrayJoKing 🇦🇺 902 106 37ms 3 Aug 2023 409th Lydxn 🇨🇦 901 61 1,473ms 5 Aug 2023 410th Steffan153 🇫🇮 901 90 107ms 7 May 2023 410th DialFrost 🇸🇬 901 90 169ms 22 Aug 2024 412th DialFrost 🇸🇬 901 94 3,214ms 1 Jan 2026 413th DialFrost 🇸🇬 901 112 374ms 26 Sep 2025 414th m-tkach 🇺🇦 901 130 42ms 16 Dec 2023 415th Lydxn 🇨🇦 899 51 38ms 9 Jan 2022 415th annaproxy 899 51 32ms 27 Oct 2023 417th primo-ppcg 🇹🇭 899 67 257ms 19 Nov 2022 418th DialFrost 🇸🇬 899 93 40ms 20 Oct 2024 419th ovs-code 🇩🇪 898 84 344ms 30 Sep 2024 420th DialFrost 🇸🇬 898 107 288ms 23 Sep 2024 421st GrayJoKing 🇦🇺 898 113 1,922ms 4 Mar 2025 422nd primo-ppcg 🇹🇭 898 148 29ms 12 May 2023 423rd ovs-code 🇩🇪 897 42 76ms 12 Sep 2024 424th inventshah 897 91 7ms 29 Jan 2024 424th sisyphus-ppcg 🇦🇺 897 91 6ms 4 Sep 2024 424th DialFrost 🇸🇬 897 91 5ms 4 Sep 2024 427th DialFrost 🇸🇬 897 117 133ms 23 Apr 2025 427th kumavale 897 117 132ms 12 Nov 2025 429th lifthrasiir 🇰🇷 897 221 332ms 19 Dec 2024 430th sisyphus-ppcg 🇦🇺 896 68 2,667ms 29 Aug 2024 431st jipsong 🇩🇪 896 86 486ms 7 Apr 2025 432nd sean-niemann 🇺🇸 896 113 59ms 9 Jan 2025 433rd DialFrost 🇸🇬 896 120 180ms 17 Oct 2024 434th saito-ta 🇯🇵 895 382 1ms 1 Aug 2023 435th stefangimmillaro 894 42 38ms 26 Dec 2024 435th primo-ppcg 🇹🇭 894 42 42ms 6 Jan 2025 437th jslip 894 59 114ms 11 Jan 2019 437th andersk 🇺🇸 894 59 115ms 21 Mar 2020 437th GrayJoKing 🇦🇺 894 59 119ms 8 Dec 2020 437th lynn 894 59 120ms 14 May 2021 437th jipsong 🇩🇪 894 59 113ms 2 Sep 2023 442nd Lydxn 🇨🇦 894 67 353ms 4 Feb 2023 443rd btnlq 894 99 454ms 3 Mar 2023 444th primo-ppcg 🇹🇭 893 99 42ms 26 Apr 2025 445th JayXon 🇺🇸 891 154 1,717ms 20 Jan 2026 446th didion0 🇺🇸 890 54 9ms 24 Feb 2022 447th Steffan153 🇫🇮 889 114 68ms 30 Aug 2024 448th DialFrost 🇸🇬 888 98 120ms 23 Dec 2025 449th sean-niemann 🇺🇸 887 92 3ms 9 Jan 2025 449th Steffan153 🇫🇮 887 92 5ms 11 Feb 2026 451st sean-niemann 🇺🇸 886 114 470ms 26 Sep 2025 452nd MeWhenI 🇻🇦 885 94 189ms 28 Feb 2025 453rd primo-ppcg 🇹🇭 885 100 408ms 21 Nov 2021 453rd sean-niemann 🇺🇸 885 100 416ms 19 Oct 2023 455th DialFrost 🇸🇬 885 132 1,425ms 28 Mar 2025 456th DialFrost 🇸🇬 885 155 1,649ms 20 Jan 2026 457th yujh-yujh 🇬🇸 884 53 13ms 4 Apr 2025 458th ovs-code 🇩🇪 884 76 724ms 18 Dec 2025 459th primo-ppcg 🇹🇭 882 69 1,537ms 28 Jan 2023 460th DialFrost 🇸🇬 882 91 111ms 14 Apr 2025 461st edsrzf 🇳🇿 881 68 163ms 17 Nov 2025 462nd kkoenig 881 143 300ms 10 Sep 2025 463rd primo-ppcg 🇹🇭 881 238 122ms 6 Aug 2025 464th sean-niemann 🇺🇸 880 95 83ms 25 Mar 2025 465th jared-hughes 880 99 33ms 23 Dec 2025 465th sean-niemann 🇺🇸 880 99 33ms 25 Dec 2025 465th Steffan153 🇫🇮 880 99 34ms 18 Feb 2026 468th perlebach 🇨🇿 879 29 37ms 12 Jun 2025 469th Steffan153 🇫🇮 879 60 115ms 7 May 2023 469th Lydxn 🇨🇦 879 60 117ms 14 Jul 2023 469th btnlq 879 60 115ms 17 Oct 2023 469th DialFrost 🇸🇬 879 60 123ms 7 Aug 2024 469th sean-niemann 🇺🇸 879 60 117ms 7 Jan 2025 469th iczelia 🇩🇪 879 60 119ms 21 Sep 2025 475th Steffan153 🇫🇮 878 115 390ms 11 Feb 2026 476th btnlq 877 86 369ms 28 Sep 2024 477th typeswitch-dev 🇵🇹 877 109 38ms 22 Aug 2025 478th GrayJoKing 🇦🇺 876 43 80ms 13 Sep 2024 479th stefangimmillaro 876 101 423ms 16 Sep 2023 480th GrayJoKing 🇦🇺 875 123 198ms 2 Feb 2024 First Prev 401–480 of 3,435 Next Last