The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 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 875th HHHMGK 842 95 63ms 2 Oct 2025 875th esobolev321 842 95 449ms 11 Nov 2025 883rd dokutan 842 151 1,707ms 2 Nov 2025 884th DialFrost 🇸🇬 842 202 721ms 13 Aug 2025 885th MeWhenI 🇻🇦 841 68 228ms 22 Nov 2022 885th PPKFS 841 68 203ms 10 Dec 2022 887th ovs-code 🇩🇪 841 78 53ms 11 Dec 2023 888th ChrisTheisen 841 89 370ms 12 Dec 2022 888th yannikHoeflich 841 89 358ms 12 Dec 2022 888th astdefu 841 89 381ms 13 Dec 2022 888th bac0id 841 89 373ms 26 Sep 2023 888th KatieLG 🇬🇧 841 89 407ms 28 Apr 2024 888th albanian-laundromat 841 89 389ms 30 Sep 2025 894th Shanethegamer 🇺🇸 841 91 43ms 13 Feb 2025 894th edsrzf 🇳🇿 841 91 46ms 15 Apr 2025 896th janbehrens 🇩🇪 841 116 27ms 19 Nov 2022 897th pardouin 🇫🇷 840 42 454ms 15 Sep 2024 898th Andriamanitra 🇫🇮 840 48 1,293ms 28 Jul 2023 899th DialFrost 🇸🇬 840 67 43ms 29 Oct 2024 899th SirBogman 🇺🇸 840 67 43ms 29 Oct 2024 901st h3ra993huskp 🇯🇵 840 94 472ms 30 Nov 2025 902nd Betuaredead 840 119 287ms 7 Jan 2023 903rd xnor-gate 839 64 52ms 21 Nov 2022 903rd sisyphus-ppcg 🇦🇺 839 64 69ms 23 Nov 2022 903rd thehylian 839 64 51ms 1 Jan 2023 903rd prplz 🇦🇺 839 64 67ms 3 Jan 2023 903rd AlephSquirrel 839 64 52ms 22 Jan 2023 903rd lynn 839 64 68ms 30 Jan 2023 903rd nwellnhof 🇩🇪 839 64 66ms 11 Mar 2023 903rd FortuiteMan 🇫🇷 839 64 37ms 23 Apr 2023 903rd bac0id 839 64 57ms 26 Sep 2023 903rd ovs-code 🇩🇪 839 64 67ms 2 Jan 2024 903rd gallium-gonzollium 839 64 69ms 25 Aug 2024 903rd MeWhenI 🇻🇦 839 64 66ms 27 Oct 2024 903rd mrondon8 839 64 70ms 2 Dec 2024 903rd nullie 839 64 68ms 2 Dec 2024 903rd tjwrenn 839 64 70ms 6 Dec 2024 903rd 4atj 839 64 68ms 30 Jun 2025 903rd bizy-coder 839 64 52ms 9 Dec 2025 903rd zacjl 839 64 68ms 11 Dec 2025 903rd Seek64 🇩🇪 839 64 67ms 13 Dec 2025 903rd lukegustafson 🇺🇸 839 64 65ms 16 Jan 2026 923rd GrayJoKing 🇦🇺 839 80 136ms 19 Nov 2022 924th Steffan153 🇫🇮 838 95 48ms 5 Oct 2023 925th StHagel 837 88 129ms 25 May 2023 925th malworthy 837 88 130ms 30 Oct 2023 927th KatieLG 🇬🇧 836 49 59ms 10 Jan 2023 927th Haksell 🇦🇶 836 49 74ms 22 Feb 2023 927th Andriamanitra 🇫🇮 836 49 53ms 26 Apr 2023 927th yzhs 🇩🇪 836 49 52ms 21 Jun 2023 927th aaronze 🇦🇺 836 49 53ms 17 Sep 2023 927th dokutan 836 49 52ms 5 Sep 2024 927th edsrzf 🇳🇿 836 49 55ms 21 Jan 2025 927th csharpython 836 49 52ms 23 Jul 2025 927th snoozingnewt 🇨🇦 836 49 56ms 9 Oct 2025 936th Betuaredead 836 91 449ms 7 Jan 2023 936th dokutan 836 91 472ms 27 Sep 2025 938th MeWhenI 🇻🇦 835 146 1,417ms 28 Mar 2025 939th saito-ta 🇯🇵 834 42 86ms 13 Aug 2025 940th NickTheEASDude 🇺🇸 834 78 36ms 8 Aug 2024 941st SirBogman 🇺🇸 833 24 806ms 20 Nov 2022 941st primo-ppcg 🇹🇭 833 24 803ms 20 Nov 2022 941st clockworknazo 833 24 775ms 20 Nov 2022 941st saito-ta 🇯🇵 833 24 757ms 22 Nov 2022 941st MeWhenI 🇻🇦 833 24 774ms 23 Nov 2022 941st Steffan153 🇫🇮 833 24 806ms 18 Dec 2022 941st lynn 833 24 817ms 30 Jan 2023 941st sean-niemann 🇺🇸 833 24 797ms 21 Feb 2023 941st ovs-code 🇩🇪 833 24 806ms 8 Jan 2024 941st emgordon154 833 24 813ms 3 Jun 2025 951st Alessandro-Balconi 🇮🇹 833 45 98ms 26 Dec 2022 952nd Yewzir 🇧🇪 833 61 453ms 4 Feb 2024 952nd MeWhenI 🇻🇦 833 61 598ms 24 May 2024 954th blaztoma 🇱🇹 833 93 119ms 28 Nov 2025 955th m-tkach 🇺🇦 833 96 436ms 22 Nov 2022 956th LukeBridges 🇬🇧 832 59 11ms 28 Nov 2022 956th Mazn3k 832 59 11ms 14 Feb 2023 956th weliveinhell 🇭🇹 832 59 9ms 27 Sep 2023 956th eranws 832 59 10ms 23 Dec 2024 956th daniel-cardone 832 59 13ms 28 Jun 2025 First Prev 881–960 of 2,740 Next Last