The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 876th dokutan 842 95 62ms 31 Jan 2025 876th HHHMGK 842 95 67ms 2 Oct 2025 876th esobolev321 842 95 450ms 11 Nov 2025 884th dokutan 842 151 1,707ms 2 Nov 2025 885th DialFrost 🇸🇬 842 202 721ms 13 Aug 2025 886th MeWhenI 🇻🇦 841 68 228ms 22 Nov 2022 886th PPKFS 841 68 203ms 10 Dec 2022 888th ovs-code 🇩🇪 841 78 53ms 11 Dec 2023 889th ChrisTheisen 841 89 370ms 12 Dec 2022 889th yannikHoeflich 841 89 358ms 12 Dec 2022 889th astdefu 841 89 381ms 13 Dec 2022 889th bac0id 841 89 373ms 26 Sep 2023 889th KatieLG 🇬🇧 841 89 407ms 28 Apr 2024 889th albanian-laundromat 841 89 389ms 30 Sep 2025 895th Shanethegamer 🇺🇸 841 91 43ms 13 Feb 2025 895th edsrzf 🇳🇿 841 91 46ms 15 Apr 2025 897th h3ra993huskp 🇯🇵 841 94 472ms 30 Nov 2025 898th janbehrens 🇩🇪 841 116 27ms 19 Nov 2022 899th pardouin 🇫🇷 840 42 454ms 15 Sep 2024 900th Andriamanitra 🇫🇮 840 48 1,293ms 28 Jul 2023 901st DialFrost 🇸🇬 840 67 43ms 29 Oct 2024 901st SirBogman 🇺🇸 840 67 43ms 29 Oct 2024 903rd Betuaredead 840 119 287ms 7 Jan 2023 904th xnor-gate 839 64 52ms 21 Nov 2022 904th sisyphus-ppcg 🇦🇺 839 64 69ms 23 Nov 2022 904th thehylian 839 64 51ms 1 Jan 2023 904th prplz 🇦🇺 839 64 67ms 3 Jan 2023 904th AlephSquirrel 839 64 52ms 22 Jan 2023 904th lynn 839 64 68ms 30 Jan 2023 904th nwellnhof 🇩🇪 839 64 66ms 11 Mar 2023 904th FortuiteMan 🇫🇷 839 64 37ms 23 Apr 2023 904th bac0id 839 64 57ms 26 Sep 2023 904th ovs-code 🇩🇪 839 64 67ms 2 Jan 2024 904th gallium-gonzollium 839 64 69ms 25 Aug 2024 904th MeWhenI 🇻🇦 839 64 66ms 27 Oct 2024 904th mrondon8 839 64 70ms 2 Dec 2024 904th nullie 839 64 68ms 2 Dec 2024 904th tjwrenn 839 64 70ms 6 Dec 2024 904th 4atj 839 64 68ms 30 Jun 2025 904th bizy-coder 839 64 52ms 9 Dec 2025 904th zacjl 839 64 68ms 11 Dec 2025 904th Seek64 🇩🇪 839 64 67ms 13 Dec 2025 904th lukegustafson 🇺🇸 839 64 65ms 16 Jan 2026 924th GrayJoKing 🇦🇺 839 80 136ms 19 Nov 2022 925th Steffan153 🇫🇮 838 95 48ms 5 Oct 2023 926th StHagel 837 88 129ms 25 May 2023 926th malworthy 837 88 130ms 30 Oct 2023 928th KatieLG 🇬🇧 836 49 59ms 10 Jan 2023 928th Haksell 🇦🇶 836 49 74ms 22 Feb 2023 928th Andriamanitra 🇫🇮 836 49 53ms 26 Apr 2023 928th yzhs 🇩🇪 836 49 52ms 21 Jun 2023 928th aaronze 🇦🇺 836 49 53ms 17 Sep 2023 928th dokutan 836 49 52ms 5 Sep 2024 928th edsrzf 🇳🇿 836 49 55ms 21 Jan 2025 928th csharpython 836 49 52ms 23 Jul 2025 928th snoozingnewt 🇨🇦 836 49 56ms 9 Oct 2025 937th Betuaredead 836 91 449ms 7 Jan 2023 937th dokutan 836 91 472ms 27 Sep 2025 939th MeWhenI 🇻🇦 835 146 1,417ms 28 Mar 2025 940th saito-ta 🇯🇵 834 42 86ms 13 Aug 2025 941st Yewzir 🇧🇪 834 61 453ms 4 Feb 2024 941st MeWhenI 🇻🇦 834 61 598ms 24 May 2024 943rd NickTheEASDude 🇺🇸 834 78 36ms 8 Aug 2024 944th SirBogman 🇺🇸 833 24 806ms 20 Nov 2022 944th primo-ppcg 🇹🇭 833 24 803ms 20 Nov 2022 944th clockworknazo 833 24 775ms 20 Nov 2022 944th saito-ta 🇯🇵 833 24 757ms 22 Nov 2022 944th MeWhenI 🇻🇦 833 24 774ms 23 Nov 2022 944th Steffan153 🇫🇮 833 24 806ms 18 Dec 2022 944th lynn 833 24 817ms 30 Jan 2023 944th sean-niemann 🇺🇸 833 24 797ms 21 Feb 2023 944th ovs-code 🇩🇪 833 24 806ms 8 Jan 2024 944th emgordon154 833 24 813ms 3 Jun 2025 954th Alessandro-Balconi 🇮🇹 833 45 98ms 26 Dec 2022 955th blaztoma 🇱🇹 833 93 119ms 28 Nov 2025 956th m-tkach 🇺🇦 833 96 427ms 22 Nov 2022 957th LukeBridges 🇬🇧 832 59 12ms 28 Nov 2022 957th Mazn3k 832 59 14ms 14 Feb 2023 957th weliveinhell 🇭🇹 832 59 15ms 27 Sep 2023 957th eranws 832 59 13ms 23 Dec 2024 First Prev 881–960 of 2,746 Next Last