The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Abundant 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 801st GrayJoKing 🇦🇺 854 67 101ms 13 Sep 2024 801st Kacarott 🇦🇺 854 67 99ms 13 Sep 2024 803rd jerrandolph 854 117 291ms 20 Oct 2023 803rd JRaspass 🇬🇧 854 117 301ms 7 Feb 2024 805th frankgraziano 854 199 695ms 12 Aug 2025 806th Tine86 853 66 41ms 30 Jul 2025 807th msbranicky 853 75 140ms 7 Sep 2023 808th ovs-code 🇩🇪 853 149 1,806ms 14 Sep 2025 808th MeWhenI 🇻🇦 853 149 1,718ms 7 Nov 2025 810th jared-hughes 853 151 315ms 18 Dec 2024 811th Steffan153 🇫🇮 852 44 102ms 15 Aug 2024 812th jsthope 852 63 24ms 21 Nov 2022 812th HPWiz 🇳🇿 852 63 3,184ms 12 Dec 2025 814th MeWhenI 🇻🇦 852 77 56ms 9 May 2024 815th GolfingSuccess 🇬🇷 852 143 1,466ms 6 Dec 2025 816th steffan-polygolf 851 72 144ms 19 Feb 2023 816th dokutan 851 72 130ms 6 Jan 2024 818th CatsAreFluffy 851 88 360ms 28 Nov 2022 818th bwat2 851 88 362ms 6 Apr 2023 818th Adix-null 🇱🇹 851 88 388ms 17 May 2023 818th Ripick 851 88 384ms 14 Jun 2025 818th qrakhen 851 88 432ms 1 Dec 2025 823rd Re-Adventures 🇮🇳 851 94 65ms 20 Nov 2022 823rd Irratix 🇳🇱 851 94 62ms 15 Dec 2022 823rd Yewzir 🇧🇪 851 94 58ms 3 Feb 2023 823rd emgordon154 851 94 57ms 8 Feb 2026 827th emgordon154 850 52 162ms 6 Jun 2025 828th Shanethegamer 🇺🇸 850 72 158ms 19 Nov 2022 828th KatieLG 🇬🇧 850 72 156ms 14 Jan 2023 828th HumanoidCPU 850 72 141ms 2 May 2024 831st kmathis22 850 93 364ms 23 Oct 2025 831st ethanlally 850 93 477ms 12 Nov 2025 831st prestosilver 🇺🇸 850 93 409ms 4 days ago 831st error256 850 93 355ms 4 days ago 831st tomh1012 850 93 383ms 4 days ago 831st jkelly467 850 93 375ms 4 days ago 831st zakariamouhid 850 93 378ms 2 days ago 838th sisyphus-ppcg 🇦🇺 848 36 321ms 9 Feb 2023 839th AlephSquirrel 848 60 466ms 21 Jan 2024 839th b-illy 🇬🇧 848 60 496ms 7 Sep 2024 839th HumanoidCPU 848 60 425ms 9 Sep 2024 839th lifthrasiir 🇰🇷 848 60 435ms 2 Dec 2024 839th JunkIce 848 60 425ms 3 Dec 2024 839th commandz0 🇺🇸 848 60 468ms 1 Sep 2025 845th ovs-code 🇩🇪 848 152 315ms 9 Jul 2024 846th JGDoerrer 847 87 132ms 20 Dec 2022 846th makononov 847 87 140ms 5 Mar 2025 846th Florian-Mt 847 87 133ms 10 Dec 2025 846th AndreiDTU 847 87 123ms 27 Feb 2026 850th dokutan 847 118 292ms 8 Dec 2023 851st Betuaredead 846 58 14ms 7 Jan 2023 851st raphaelimahorn 846 58 12ms 24 Mar 2023 851st piano-miles 846 58 13ms 30 Mar 2023 851st ShiraJoseph 🇺🇸 846 58 12ms 21 Jul 2023 851st Larento 846 58 13ms 13 Oct 2023 851st Davr1 🇨🇿 846 58 17ms 15 Oct 2023 851st uttumuttu 🇫🇮 846 58 17ms 22 Dec 2023 851st efgen 846 58 11ms 26 Dec 2023 851st mrondon8 846 58 17ms 4 Dec 2024 851st Andrey-Plotnikov 846 58 11ms 21 Jun 2025 851st CaedenHarper 🇨🇦 846 58 11ms 3 Sep 2025 851st LordSir101 846 58 12ms 17 Sep 2025 851st albanian-laundromat 846 58 13ms 18 Nov 2025 864th janbehrens 🇩🇪 846 63 14ms 19 Nov 2022 865th Yewzir 🇧🇪 846 90 472ms 5 Nov 2023 865th snoozingnewt 🇨🇦 846 90 475ms 10 Dec 2025 867th adriweb 🇫🇷 845 77 54ms 29 Aug 2023 867th frosster 🇨🇦 845 77 49ms 7 Feb 2026 869th KatieLG 🇬🇧 845 105 364ms 21 Nov 2022 870th AlephSquirrel 844 29 11ms 4 Nov 2025 871st primo-ppcg 🇹🇭 844 71 2ms 20 Nov 2022 871st DialFrost 🇸🇬 844 71 2ms 15 Dec 2025 873rd ovs-code 🇩🇪 844 80 1,545ms 4 Jul 2024 874th DialFrost 🇸🇬 843 66 639ms 16 Dec 2024 875th Shanethegamer 🇺🇸 842 68 86ms 22 Nov 2024 875th primo-ppcg 🇹🇭 842 68 79ms 5 Apr 2025 875th Steffan153 🇫🇮 842 68 81ms 13 Feb 2026 878th janbehrens 🇩🇪 842 95 61ms 20 Nov 2022 878th Shanethegamer 🇺🇸 842 95 66ms 2 Dec 2022 878th Betuaredead 842 95 64ms 6 Jan 2023 First Prev 801–880 of 2,749 Next Last