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?
Forsyth–Edwards Notation 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 321st stefangimmillaro 754 208 297ms 6 May 2025 322nd DialFrost 🇸🇬 753 120 3ms 25 Oct 2023 323rd stefangimmillaro 753 131 2,749ms 14 Nov 2024 324th Shanethegamer 🇺🇸 753 174 5ms 4 Oct 2024 325th ovs-code 🇩🇪 751 100 469ms 16 Feb 2024 326th sean-niemann 🇺🇸 751 169 40ms 9 Dec 2023 327th GrayJoKing 🇦🇺 751 209 27ms 24 May 2023 328th jacobly0 🇺🇸 751 236 1,649ms 22 Apr 2024 329th ovs-code 🇩🇪 750 56 41ms 25 Feb 2025 330th fkantelberg 748 109 10ms 25 Jul 2023 330th HumanoidCPU 748 109 10ms 10 Jan 2026 332nd ericlangedijk 🇸🇮 748 131 417ms 22 May 2023 332nd revlayle 🇺🇸 748 131 415ms 7 Jun 2023 332nd AdrienHache 🇫🇷 748 131 440ms 28 Dec 2024 335th 2bular 747 73 2ms 11 Nov 2025 336th Shanethegamer 🇺🇸 747 140 4ms 2 May 2023 337th Waffle3z 747 155 1ms 14 Sep 2023 337th edsrzf 🇳🇿 747 155 2ms 22 Aug 2025 339th emplv 🇱🇻 747 210 292ms 6 May 2023 340th ovs-code 🇩🇪 743 102 452ms 2 Mar 2024 341st Salutations45 743 129 10ms 3 Dec 2024 341st targrik 743 129 12ms 9 Jun 2025 343rd edsrzf 🇳🇿 743 211 288ms 16 Apr 2025 344th ovs-code 🇩🇪 743 287 7ms 8 Jul 2024 345th Shanethegamer 🇺🇸 742 156 1ms 5 May 2023 346th stefangimmillaro 741 83 35ms 24 May 2025 347th GolfingSuccess 🇬🇷 741 89 7ms 1 May 2023 348th jmerle 🇳🇱 741 110 10ms 11 Jul 2023 348th SB-945 741 110 10ms 13 Jan 2024 350th edsrzf 🇳🇿 741 155 63ms 27 Jul 2025 351st janbehrens 🇩🇪 738 174 514ms 1 May 2023 352nd lynn 737 57 42ms 17 Oct 2023 353rd uttumuttu 🇫🇮 737 130 9ms 22 Dec 2023 354th MeWhenI 🇻🇦 737 134 8ms 9 May 2024 355th alemelis 736 102 1,088ms 5 Oct 2024 356th stefangimmillaro 736 205 191ms 4 Jun 2025 357th prestosilver 🇺🇸 735 172 485ms 24 days ago 358th anter69 🇭🇺 732 84 35ms 27 Mar 2024 359th MeWhenI 🇻🇦 730 215 284ms 1 May 2023 359th Shanethegamer 🇺🇸 730 215 282ms 14 Jul 2023 361st Shanethegamer 🇺🇸 728 192 163ms 3 May 2023 362nd DialFrost 🇸🇬 726 132 9ms 11 Oct 2023 363rd mtirado1 723 160 1ms 1 May 2023 364th KatieLG 🇬🇧 721 105 364ms 6 Oct 2025 364th HumanoidCPU 721 105 447ms 10 Jan 2026 366th DialFrost 🇸🇬 721 108 1,093ms 31 Aug 2025 366th CaedenHarper 🇨🇦 721 108 1,115ms 16 Sep 2025 368th janbehrens 🇩🇪 721 133 11ms 17 Jun 2023 368th KingSkyrock 🇺🇸 721 133 12ms 15 Oct 2024 370th annaproxy 721 136 414ms 22 May 2023 370th Shanethegamer 🇺🇸 721 136 409ms 26 Mar 2024 372nd dokutan 721 137 8ms 4 Oct 2024 373rd MeWhenI 🇻🇦 720 194 160ms 1 May 2023 374th Shanethegamer 🇺🇸 719 172 2ms 10 May 2023 375th DialFrost 🇸🇬 717 76 2ms 10 Feb 2024 375th lifthrasiir 🇰🇷 717 76 2ms 6 Dec 2024 375th emgordon154 717 76 2ms 8 Jun 2025 378th Shanethegamer 🇺🇸 717 173 4ms 19 Oct 2024 379th tatzyr 🇯🇵 715 86 38ms 24 Feb 2025 380th adamnielson42 🇺🇸 715 104 3ms 10 Jan 2024 381st RockOfStone 714 162 1ms 4 Nov 2025 382nd janAkali 🇷🇺 711 178 433ms 21 Feb 2026 383rd jared-hughes 710 135 9ms 28 Jul 2023 383rd Argeento 🇵🇱 710 135 9ms 8 Sep 2023 383rd itserasmus 710 135 9ms 17 Jan 2024 383rd tomh1012 710 135 10ms 11 hours ago 383rd Yax42 🇫🇷 710 135 10ms 7 hours ago 388th MeWhenI 🇻🇦 710 138 417ms 26 Jul 2023 389th jeff-at-tamer-dot-codes 🇺🇸 709 115 10ms 17 May 2023 389th yzhs 🇩🇪 709 115 10ms 22 Jun 2023 391st MeWhenI 🇻🇦 709 148 115ms 7 Aug 2023 392nd TFeld00 🇩🇰 707 87 35ms 3 Sep 2024 393rd janbehrens 🇩🇪 707 188 452ms 1 May 2023 394th stefangimmillaro 706 198 301ms 13 Oct 2024 395th madex 🇩🇪 705 136 9ms 24 Jul 2025 396th luuumine 🇫🇷 703 116 11ms 27 Oct 2025 397th cbrt-x 703 183 117ms 20 Jan 2025 398th GrayJoKing 🇦🇺 701 117 143ms 12 Aug 2024 399th olleicua 🇺🇸 700 137 10ms 3 Feb 2024 399th CaedenHarper 🇨🇦 700 137 14ms 23 Aug 2025 First Prev 321–400 of 854 Next Last