The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
United States 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 241st acotis 822 185 174ms 15 Feb 2026 242nd bryanmytko 821 112 11ms 9 Sep 2023 242nd iczelia 🇩🇪 821 112 10ms 19 Oct 2025 244th olivermrose 🇺🇸 820 67 36ms 22 Sep 2021 244th MeWhenI 🇻🇦 820 67 35ms 16 Aug 2022 244th DialFrost 🇸🇬 820 67 37ms 24 Jan 2023 244th Steffan153 🇫🇮 820 67 70ms 25 Jan 2023 244th sean-niemann 🇺🇸 820 67 83ms 7 Jul 2025 244th pardouin 🇫🇷 820 67 34ms 11 Aug 2025 250th anter69 🇭🇺 817 95 1,578ms 1 Feb 2026 251st MeWhenI 🇻🇦 817 136 447ms 27 Jul 2024 252nd Steffan153 🇫🇮 816 167 30ms 12 Feb 2026 253rd DialFrost 🇸🇬 815 87 527ms 15 Jan 2024 253rd neel11235813 815 87 469ms 10 Mar 2024 253rd namelessiw 815 87 509ms 31 Aug 2025 253rd Babafaba 815 87 430ms 20 Nov 2025 257th AlephSquirrel 812 75 87ms 9 Sep 2024 258th DialFrost 🇸🇬 812 306 1,678ms 28 Jan 2025 259th MostParsingVex 811 113 2ms 27 Jul 2024 260th DialFrost 🇸🇬 810 99 856ms 29 Aug 2025 260th CaedenHarper 🇨🇦 810 99 1,207ms 6 Sep 2025 262nd sean-niemann 🇺🇸 810 117 5ms 24 Sep 2025 263rd SirBogman 🇺🇸 808 174 1,541ms 23 Jul 2022 264th AdrienHache 🇫🇷 807 117 453ms 22 Aug 2025 265th duckyluuk 🇳🇱 806 88 470ms 28 Aug 2024 265th KatieLG 🇬🇧 806 88 459ms 28 Oct 2024 265th lifthrasiir 🇰🇷 806 88 445ms 2 Dec 2024 268th Henrixounez 806 114 12ms 17 Sep 2021 269th IISResetMe 804 95 286ms 7 Mar 2024 270th Steffan153 🇫🇮 804 114 2ms 20 Aug 2024 271st edsrzf 🇳🇿 804 118 5ms 16 Feb 2025 272nd edsrzf 🇳🇿 804 165 8ms 12 Nov 2025 273rd m-tkach 🇺🇦 803 172 105ms 30 Jul 2022 274th MeWhenI 🇻🇦 801 136 144ms 26 Oct 2022 275th lowlighter 799 115 14ms 12 Mar 2021 276th edsrzf 🇳🇿 799 139 418ms 10 Jul 2025 277th janlelis 797 69 39ms 21 Sep 2024 277th anter69 🇭🇺 797 69 36ms 1 Feb 2026 279th commandz0 🇺🇸 796 82 2ms 13 Apr 2025 280th Jaykul 796 96 303ms 20 Apr 2024 281st ovs-code 🇩🇪 795 137 430ms 24 Sep 2023 282nd xsot 🇸🇬 794 96 2ms 30 Jun 2024 283rd KrausRaus 🇺🇸 793 116 10ms 4 Nov 2020 284th plcc0 791 98 11ms 22 days ago 285th sean-niemann 🇺🇸 790 138 125ms 20 Jul 2024 286th dokutan 788 191 3ms 11 Sep 2025 287th aliakseikalosha 786 117 11ms 28 Aug 2023 288th sean-niemann 🇺🇸 784 197 2ms 16 Jan 2024 289th sean-niemann 🇺🇸 783 117 2ms 23 Jul 2025 290th AlephSquirrel 779 80 41ms 29 Jul 2023 291st janlelis 779 118 12ms 10 Feb 2021 292nd MeWhenI 🇻🇦 778 163 651ms 7 Nov 2025 292nd ScottHamper 778 163 656ms 30 Nov 2025 294th MarcMush 🇫🇷 776 97 447ms 2 Feb 2024 295th primo-ppcg 🇹🇭 776 178 68ms 25 Jun 2022 296th SirBogman 🇺🇸 776 213 41ms 23 Jul 2022 297th SirBogman 🇺🇸 774 71 36ms 13 Jun 2024 298th elisherer 🇮🇱 773 119 12ms 7 Oct 2021 299th Natanaelel 🇸🇪 773 220 131ms 19 Jul 2023 300th janbehrens 🇩🇪 772 99 264ms 13 Jan 2024 300th MeWhenI 🇻🇦 772 99 255ms 27 Jan 2025 302nd MeWhenI 🇻🇦 771 108 5ms 13 Aug 2024 303rd ovs-code 🇩🇪 770 119 2ms 16 Feb 2024 304th CornerMercury 🇬🇧 768 101 17ms 4 Nov 2025 305th kumavale 768 198 169ms 14 Nov 2025 306th CLOStrophobic 🇮🇹 767 173 6ms 20 Feb 2025 307th emplv 🇱🇻 765 124 5ms 7 Jul 2022 308th Steffan153 🇫🇮 761 160 4ms 10 mins ago 309th argusdusty 🇺🇸 761 200 161ms 2 Jan 2021 310th btjones0 760 102 17ms 15 Jul 2022 310th ndren 760 102 22ms 12 Nov 2023 310th Deedogg 760 102 16ms 30 Oct 2025 313th Posandu 760 121 12ms 6 Mar 2022 314th SirBogman 🇺🇸 754 122 12ms 14 Jun 2020 315th b10011 🇫🇮 753 103 17ms 7 Jan 2023 315th SB-945 753 103 10ms 4 Jul 2023 315th FortuiteMan 🇫🇷 753 103 11ms 11 Sep 2023 315th zach333 753 103 11ms 18 Jul 2024 319th MeWhenI 🇻🇦 753 126 5ms 27 Jan 2025 320th KasperKivimaeki 🇫🇮 751 122 2ms 10 Sep 2025 First Prev 241–320 of 1,422 Next Last