The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 hours. Why not try and solve them ahead of time?
Niven Numbers (Long) 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 879th DialFrost 🇸🇬 866 66 40ms 11 Apr 2025 882nd MeWhenI 🇻🇦 865 81 492ms 7 Nov 2025 883rd GolfingSuccess 🇬🇷 865 94 60ms 1 Mar 2026 883rd kg583 🇺🇸 865 94 89ms 27 days ago 883rd Steffan153 🇫🇮 865 94 55ms 10 days ago 886th sisyphus-ppcg 🇦🇺 864 103 289ms 8 Aug 2022 886th GrayJoKing 🇦🇺 864 103 281ms 14 Aug 2022 888th Shanethegamer 🇺🇸 863 90 114ms 15 Apr 2025 888th emgordon154 863 90 119ms 29 Nov 2025 890th GrayJoKing 🇦🇺 861 35 31ms 13 Aug 2022 891st JPRuskin 🇬🇧 861 42 4,199ms 26 Apr 2024 891st 5quiwyrm 861 42 4,211ms 10 Dec 2024 893rd sidok 861 45 372ms 5 May 2024 893rd fuzzylojik-golf 🇺🇸 861 45 284ms 8 Jul 2025 895th NewDefectus 🇮🇱 861 68 2ms 9 Aug 2022 895th Yewzir 🇧🇪 861 68 2ms 10 Apr 2024 895th DialFrost 🇸🇬 861 68 2ms 11 Apr 2025 895th madex 🇩🇪 861 68 3ms 12 days ago 895th solisolu 861 68 3ms 2 days ago 900th Yewzir 🇧🇪 861 74 404ms 10 Apr 2024 900th b-illy 🇬🇧 861 74 424ms 8 Dec 2025 902nd jared-hughes 860 88 50ms 14 Aug 2022 902nd MeWhenI 🇻🇦 860 88 60ms 21 Feb 2023 902nd Yewzir 🇧🇪 860 88 64ms 10 Apr 2024 902nd BlankSpruce 860 88 61ms 13 Nov 2024 902nd qwertyuiop3 🇷🇺 860 88 66ms 16 May 2025 902nd Herbert00709 🇵🇱 860 88 56ms 13 days ago 908th pardouin 🇫🇷 859 63 21ms 21 Oct 2024 909th GrayJoKing 🇦🇺 859 67 183ms 8 Aug 2022 909th Natanaelel 🇸🇪 859 67 182ms 9 Aug 2022 909th yzhs 🇩🇪 859 67 185ms 26 Jun 2023 909th cbrt-x 859 67 182ms 30 Aug 2024 909th pardouin 🇫🇷 859 67 189ms 19 Mar 2025 914th Yewzir 🇧🇪 859 102 24ms 10 Apr 2024 915th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 916th MeWhenI 🇻🇦 859 187 555ms 19 Apr 2025 917th uttumuttu 🇫🇮 858 56 11ms 8 Aug 2022 917th AlephSquirrel 858 56 11ms 15 Feb 2023 917th ejini6969 858 56 37ms 2 Apr 2023 920th gifti258 858 59 74ms 15 Sep 2023 921st sisyphus-ppcg 🇦🇺 858 96 16ms 15 Nov 2022 922nd Lydxn 🇨🇦 857 60 141ms 9 Aug 2022 922nd Shanethegamer 🇺🇸 857 60 130ms 9 Aug 2022 922nd Steffan153 🇫🇮 857 60 159ms 6 Dec 2022 922nd jipsong 🇩🇪 857 60 140ms 6 May 2025 926th Bubbler-4 857 83 123ms 8 Aug 2022 926th elgan65536 🇺🇸 857 83 124ms 11 Apr 2024 926th luuumine 🇫🇷 857 83 118ms 11 Nov 2025 929th DialFrost 🇸🇬 857 136 1,668ms 13 Sep 2025 929th Yewzir 🇧🇪 857 136 1,966ms 14 Nov 2025 929th Steffan153 🇫🇮 857 136 1,608ms 11 Feb 2026 932nd inventshah 856 54 98ms 12 Dec 2022 932nd MeWhenI 🇻🇦 856 54 94ms 13 Dec 2022 932nd Alessandro-Balconi 🇮🇹 856 54 97ms 15 Jul 2023 935th betaveros 856 57 16ms 8 Aug 2022 935th zacharybarbanell 856 57 15ms 8 Aug 2022 935th andre-lameirinhas 🇵🇹 856 57 17ms 8 Aug 2022 935th Bonjour27891 🇻🇳 856 57 237ms 10 Aug 2022 935th RYNO8 856 57 244ms 16 Aug 2022 935th galloj 🇨🇿 856 57 16ms 18 Aug 2022 935th commandz0 🇺🇸 856 57 17ms 27 Aug 2022 935th Eilonlif 🇮🇱 856 57 17ms 9 Sep 2022 935th MaxElf999 856 57 17ms 23 Sep 2022 935th fredrik-bakke 🇳🇴 856 57 16ms 2 Oct 2022 935th aiarzhantsev 856 57 16ms 14 Oct 2022 935th trist224 🇫🇷 856 57 243ms 18 Oct 2022 935th Stockoh 🇫🇷 856 57 236ms 21 Oct 2022 935th andersk 🇺🇸 856 57 17ms 25 Oct 2022 935th fourth-bit 856 57 237ms 6 Dec 2022 935th quimey 856 57 17ms 8 Mar 2023 935th aksyristos 856 57 17ms 11 Mar 2023 935th CedricGebistorf 856 57 17ms 4 May 2023 935th ehulinsky 🇺🇸 856 57 17ms 7 May 2023 935th Griff95 856 57 237ms 21 Sep 2023 935th inverseLorentz 🇦🇺 856 57 17ms 18 Feb 2024 935th sultan 856 57 242ms 3 Mar 2024 935th AminurAlam 856 57 17ms 20 Mar 2024 935th EnTerr 856 57 16ms 1 Sep 2024 935th logvp 856 57 233ms 7 Oct 2024 935th moustave 856 57 17ms 26 Nov 2024 First Prev 881–960 of 2,546 Next Last