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?
Tic-tac-toe in JavaScript 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 1st nwellnhof 🇩🇪 1,000 76 14ms 17 Feb 2025 1st JayXon 🇺🇸 1,000 76 19ms 18 Feb 2025 1st lukegustafson 🇺🇸 1,000 76 15ms 29 May 2025 4th rucin93 🇵🇱 987 77 19ms 26 Jan 2025 4th emplv 🇱🇻 987 77 12ms 28 Jan 2025 4th ovs-code 🇩🇪 987 77 12ms 28 Jan 2025 4th pardouin 🇫🇷 987 77 13ms 29 Jan 2025 4th DialFrost 🇸🇬 987 77 12ms 29 Jan 2025 4th helbling 🇨🇭 987 77 13ms 29 Jan 2025 4th sean-niemann 🇺🇸 987 77 28ms 30 Jan 2025 4th xsot 🇸🇬 987 77 13ms 1 Feb 2025 4th didion0 🇺🇸 987 77 13ms 14 Feb 2025 4th voytxt 🇨🇿 987 77 12ms 4 Apr 2025 4th trinityy-7 987 77 13ms 23 Jul 2025 4th Steffan153 🇫🇮 987 77 13ms 11 Feb 2026 16th MeWhenI 🇻🇦 974 78 12ms 13 Jul 2025 17th emgordon154 950 80 15ms 12 Feb 2025 17th stefangimmillaro 950 80 14ms 13 Jul 2025 19th error256 916 83 14ms 25 Jan 2025 19th Kacarott 🇦🇺 916 83 12ms 18 Feb 2025 21st Natanaelel 🇸🇪 905 84 12ms 26 Jan 2025 22nd Lv0Sys 🇵🇱 835 91 12ms 22 Feb 2026 23rd dylanarmstrong 809 94 22ms 21 Feb 2025 24th Shanethegamer 🇺🇸 792 96 14ms 16 Jan 2025 25th duckyluuk 🇳🇱 760 100 19ms 14 Feb 2025 26th Andrey-Plotnikov 731 104 12ms 29 May 2025 27th dmrichwa 🇺🇸 724 105 14ms 31 Jan 2025 28th tayloia 🇬🇧 704 108 15ms 26 Jan 2025 28th dokutan 704 108 15ms 1 Feb 2025 28th coreynash 704 108 21ms 13 Feb 2025 31st olleicua 🇺🇸 697 109 12ms 9 Sep 2025 32nd jared-hughes 679 112 14ms 13 Feb 2025 33rd Protothor 673 113 17ms 13 days ago 34th targrik 661 115 17ms 5 Feb 2025 35th JOrE20 639 119 16ms 11 Feb 2026 36th LukeBridges 🇬🇧 628 121 13ms 4 Feb 2025 37th gnlow 🇰🇷 603 126 14ms 11 Feb 2025 37th ShiraJoseph 🇺🇸 603 126 19ms 24 Feb 2025 39th madex 🇩🇪 598 127 14ms 10 Feb 2025 40th alexsave 555 137 25ms 8 Oct 2025 41st Salutations45 551 138 14ms 13 Feb 2025 42nd xyangst 547 139 23ms 14 Feb 2025 43rd junkondo-jp 528 144 21ms 8 Feb 2026 44th Robvdhout 481 158 16ms 10 Apr 2025 45th iczelia 🇩🇪 478 159 18ms 25 Oct 2025 46th HumanoidCPU 475 160 20ms 21 Feb 2025 47th kirjavascript 466 163 13ms 14 Feb 2025 48th scpchicken 🇵🇼 461 165 25ms 8 days ago 49th weliveinhell 🇭🇹 458 166 22ms 18 Jun 2025 50th acollett89 444 171 16ms 14 Jul 2025 51st tomh1012 437 174 11ms 2 days ago 52nd madeforlosers 434 175 13ms 5 Nov 2025 53rd Program-Pi 388 196 15ms 19 days ago 54th zakariamouhid 369 206 15ms 8 Mar 2025 55th CaedenHarper 🇨🇦 357 213 18ms 23 Aug 2025 56th gigaprofisi 🇺🇸 350 217 13ms 4 Nov 2025 57th jbdrucker 185 410 12ms 14 Feb 2025 58th IcedDog 107 707 14ms 14 Feb 2025 59th KatieLG 🇬🇧 9 8,216 19ms 5 Oct 2025 60th KatieLG-Transpiler 🇬🇧 4 19,312 21ms 9 Jan 2026 1–60 of 60