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 bytes. 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 Bytes Time Submitted 401st ovs-code 🇩🇪 756 311 7ms 8 Jul 2024 402nd snoozingnewt 🇨🇦 755 148 11ms 31 Oct 2025 403rd stefangimmillaro 753 212 291ms 5 May 2025 404th Bmrl7 752 152 10ms 20 Feb 2024 405th DialFrost 🇸🇬 751 129 527ms 17 Jan 2024 405th snoozingnewt 🇨🇦 751 129 463ms 20 Feb 2026 407th inventshah 751 134 1ms 1 May 2023 408th DialFrost 🇸🇬 750 78 2ms 10 Feb 2024 409th edsrzf 🇳🇿 749 158 69ms 3 Jul 2025 410th SirBogman 🇺🇸 748 102 326ms 18 May 2024 411th AlephSquirrel 747 153 10ms 1 May 2023 411th MaxElf999 747 153 10ms 2 May 2023 411th logvp 747 153 9ms 7 Oct 2024 414th emgordon154 745 130 528ms 1 May 2025 415th erikgaal 745 150 9ms 19 Jul 2023 415th robertvansteen 745 150 10ms 19 Jul 2023 417th MeWhenI 🇻🇦 743 215 284ms 1 May 2023 418th stefangimmillaro 740 143 411ms 15 Jul 2023 419th Shanethegamer 🇺🇸 740 173 4ms 19 Oct 2024 420th MeWhenI 🇻🇦 739 131 446ms 24 May 2024 421st Shanethegamer 🇺🇸 739 216 294ms 14 Jul 2023 422nd jacobly0 🇺🇸 739 262 1,649ms 22 Apr 2024 423rd MeWhenI 🇻🇦 738 84 3ms 1 May 2023 424th ovs-code 🇩🇪 738 165 3ms 27 Sep 2024 425th janbehrens 🇩🇪 735 144 385ms 1 May 2023 426th BambooleanLogic 🇸🇪 735 152 9ms 28 Jun 2023 427th neel11235813 734 132 534ms 10 Mar 2024 428th hellwue 733 156 10ms 3 May 2023 428th hiichbindermax 733 156 10ms 4 May 2023 428th albanian-laundromat 733 156 9ms 23 Apr 2025 428th zhaohm14 733 156 10ms 23 Jul 2025 432nd Salutations45 730 153 10ms 3 Dec 2024 432nd Yax42 🇫🇷 730 153 9ms 78 mins ago 434th stefangimmillaro 728 94 35ms 23 May 2025 435th GolfingSuccess 🇬🇷 728 133 456ms 2 Mar 2024 436th alemelis 724 158 10ms 5 Oct 2024 437th MeWhenI 🇻🇦 723 177 1ms 1 May 2023 438th MeWhenI 🇻🇦 722 109 3ms 1 May 2023 439th madeforlosers 721 155 10ms 8 May 2025 440th janbehrens 🇩🇪 721 188 452ms 1 May 2023 441st anter69 🇭🇺 720 95 35ms 1 Oct 2024 442nd dokutan 720 184 9ms 3 Oct 2024 443rd DialFrost 🇸🇬 719 144 148ms 22 Nov 2025 444th KatieLG 🇬🇧 719 159 10ms 6 Apr 2025 444th andrewjc2000 719 159 10ms 30 Apr 2025 446th SirBogman 🇺🇸 717 135 489ms 16 Jan 2024 447th MeWhenI 🇻🇦 716 184 455ms 1 May 2023 448th MeWhenI 🇻🇦 715 121 251ms 26 Aug 2023 449th Alessandro-Balconi 🇮🇹 714 145 80ms 1 May 2023 450th snoozingnewt 🇨🇦 714 190 603ms 31 Oct 2025 451st 5cw 🇺🇸 713 82 2ms 1 May 2023 452nd CaedenHarper 🇨🇦 713 224 306ms 12 Nov 2025 453rd albanian-laundromat 712 197 3ms 23 Dec 2025 454th Shanethegamer 🇺🇸 711 147 1,024ms 17 May 2023 455th KingSkyrock 🇺🇸 711 157 12ms 15 Oct 2024 455th iczelia 🇩🇪 711 157 12ms 23 Oct 2025 457th Mabeloid 🇳🇴 711 180 1ms 21 Sep 2024 458th UnderKoen 🇳🇱 711 228 3ms 20 Jan 2025 459th chartung17 710 161 10ms 1 Jan 2024 459th xdaniel-lim 710 161 9ms 27 Jan 2025 461st DialFrost 🇸🇬 708 151 144ms 28 Oct 2024 462nd edsrzf 🇳🇿 708 245 222ms 17 Jun 2025 463rd Mabeloid 🇳🇴 707 137 510ms 4 May 2025 464th alexsave 707 158 10ms 16 Jan 2026 465th StefanHabel 🇨🇦 706 162 10ms 13 Aug 2023 465th SB-945 706 162 10ms 13 Jan 2024 465th markusgraube 706 162 9ms 26 Mar 2024 468th stefangimmillaro 706 222 41ms 6 May 2025 469th emgordon154 705 246 182ms 14 Mar 2025 470th janbehrens 🇩🇪 704 123 507ms 1 May 2023 471st emgordon154 704 182 4ms 27 Dec 2024 472nd duckyluuk 🇳🇱 703 146 2,647ms 25 Oct 2024 473rd snoozingnewt 🇨🇦 703 182 1ms 31 Oct 2025 474th commandz0 🇺🇸 702 138 475ms 1 Sep 2025 475th itserasmus 702 159 9ms 17 Jan 2024 475th tomh1012 702 159 10ms 5 hours ago 477th MeWhenI 🇻🇦 702 186 554ms 1 May 2023 478th FlorianCassayre 🇫🇷 701 163 10ms 24 Sep 2023 478th YAJUE114514 701 163 9ms 14 Dec 2025 480th DialFrost 🇸🇬 700 109 312ms 14 Jun 2024 First Prev 401–480 of 857 Next Last