The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. 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 881st MeWhenI 🇻🇦 865 81 492ms 7 Nov 2025 882nd GolfingSuccess 🇬🇷 865 94 60ms 27 days ago 882nd kg583 🇺🇸 865 94 89ms 24 days ago 882nd Steffan153 🇫🇮 865 94 55ms 7 days ago 885th sisyphus-ppcg 🇦🇺 864 103 289ms 8 Aug 2022 885th GrayJoKing 🇦🇺 864 103 281ms 14 Aug 2022 887th Shanethegamer 🇺🇸 863 90 114ms 15 Apr 2025 887th emgordon154 863 90 119ms 29 Nov 2025 889th GrayJoKing 🇦🇺 861 35 31ms 13 Aug 2022 890th JPRuskin 🇬🇧 861 42 4,199ms 26 Apr 2024 890th 5quiwyrm 861 42 4,211ms 10 Dec 2024 892nd sidok 861 45 372ms 5 May 2024 892nd fuzzylojik-golf 🇺🇸 861 45 284ms 8 Jul 2025 894th NewDefectus 🇮🇱 861 68 2ms 9 Aug 2022 894th Yewzir 🇧🇪 861 68 2ms 10 Apr 2024 894th DialFrost 🇸🇬 861 68 2ms 11 Apr 2025 894th madex 🇩🇪 861 68 3ms 9 days ago 898th Yewzir 🇧🇪 861 74 404ms 10 Apr 2024 898th b-illy 🇬🇧 861 74 424ms 8 Dec 2025 900th jared-hughes 860 88 50ms 14 Aug 2022 900th MeWhenI 🇻🇦 860 88 60ms 21 Feb 2023 900th Yewzir 🇧🇪 860 88 65ms 10 Apr 2024 900th BlankSpruce 860 88 61ms 13 Nov 2024 900th qwertyuiop3 🇷🇺 860 88 67ms 16 May 2025 900th Herbert00709 🇵🇱 860 88 61ms 11 days ago 906th pardouin 🇫🇷 859 63 21ms 21 Oct 2024 907th GrayJoKing 🇦🇺 859 67 183ms 8 Aug 2022 907th Natanaelel 🇸🇪 859 67 182ms 9 Aug 2022 907th yzhs 🇩🇪 859 67 185ms 26 Jun 2023 907th cbrt-x 859 67 182ms 30 Aug 2024 907th pardouin 🇫🇷 859 67 189ms 19 Mar 2025 912th lifthrasiir 🇰🇷 859 167 24ms 20 Dec 2024 913th MeWhenI 🇻🇦 859 187 555ms 19 Apr 2025 914th uttumuttu 🇫🇮 858 56 13ms 8 Aug 2022 914th AlephSquirrel 858 56 13ms 15 Feb 2023 914th ejini6969 858 56 37ms 2 Apr 2023 917th gifti258 858 59 74ms 15 Sep 2023 918th sisyphus-ppcg 🇦🇺 858 96 16ms 15 Nov 2022 919th Yewzir 🇧🇪 858 102 24ms 10 Apr 2024 920th Lydxn 🇨🇦 857 60 141ms 9 Aug 2022 920th Shanethegamer 🇺🇸 857 60 130ms 9 Aug 2022 920th Steffan153 🇫🇮 857 60 159ms 6 Dec 2022 920th jipsong 🇩🇪 857 60 140ms 6 May 2025 924th Bubbler-4 857 83 126ms 8 Aug 2022 924th elgan65536 🇺🇸 857 83 132ms 11 Apr 2024 924th luuumine 🇫🇷 857 83 140ms 11 Nov 2025 927th DialFrost 🇸🇬 857 136 1,668ms 13 Sep 2025 927th Yewzir 🇧🇪 857 136 1,966ms 14 Nov 2025 927th Steffan153 🇫🇮 857 136 1,608ms 11 Feb 2026 930th inventshah 856 54 98ms 12 Dec 2022 930th MeWhenI 🇻🇦 856 54 94ms 13 Dec 2022 930th Alessandro-Balconi 🇮🇹 856 54 97ms 15 Jul 2023 933rd betaveros 856 57 16ms 8 Aug 2022 933rd zacharybarbanell 856 57 15ms 8 Aug 2022 933rd andre-lameirinhas 🇵🇹 856 57 17ms 8 Aug 2022 933rd Bonjour27891 🇻🇳 856 57 237ms 10 Aug 2022 933rd RYNO8 856 57 244ms 16 Aug 2022 933rd galloj 🇨🇿 856 57 16ms 18 Aug 2022 933rd commandz0 🇺🇸 856 57 17ms 27 Aug 2022 933rd Eilonlif 🇮🇱 856 57 17ms 9 Sep 2022 933rd MaxElf999 856 57 17ms 23 Sep 2022 933rd fredrik-bakke 🇳🇴 856 57 16ms 2 Oct 2022 933rd aiarzhantsev 856 57 16ms 14 Oct 2022 933rd trist224 🇫🇷 856 57 243ms 18 Oct 2022 933rd Stockoh 🇫🇷 856 57 236ms 21 Oct 2022 933rd andersk 🇺🇸 856 57 17ms 25 Oct 2022 933rd fourth-bit 856 57 237ms 6 Dec 2022 933rd quimey 856 57 17ms 8 Mar 2023 933rd aksyristos 856 57 17ms 11 Mar 2023 933rd CedricGebistorf 856 57 17ms 4 May 2023 933rd ehulinsky 🇺🇸 856 57 17ms 7 May 2023 933rd Griff95 856 57 237ms 21 Sep 2023 933rd inverseLorentz 🇦🇺 856 57 17ms 18 Feb 2024 933rd sultan 856 57 242ms 3 Mar 2024 933rd AminurAlam 856 57 17ms 20 Mar 2024 933rd EnTerr 856 57 16ms 1 Sep 2024 933rd logvp 856 57 233ms 7 Oct 2024 933rd moustave 856 57 17ms 26 Nov 2024 933rd nooberitess 856 57 16ms 22 May 2025 933rd dirckvdende 856 57 16ms 5 Jul 2025 First Prev 881–960 of 2,542 Next Last