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 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 Shanethegamer 🇺🇸 679 153 485ms 16 Feb 2025 402nd bac0id 679 169 76ms 1 Feb 2026 403rd albanian-laundromat 678 117 558ms 4 Aug 2025 404th MeWhenI 🇻🇦 677 141 3ms 29 Jan 2025 405th MeWhenI 🇻🇦 676 211 12ms 26 Jan 2025 406th emgordon154 675 128 56ms 29 May 2025 407th SB-945 673 133 20ms 31 Jan 2025 407th BREMAUCY 🇫🇷 673 133 14ms 12 Aug 2025 407th wobblybits 673 133 18ms 15 Aug 2025 410th MeWhenI 🇻🇦 671 141 156ms 14 hours ago 411th MeWhenI 🇻🇦 671 155 837ms 27 Jan 2025 412th tayloia 🇬🇧 670 108 15ms 26 Jan 2025 412th coreynash 670 108 21ms 13 Feb 2025 414th CaedenHarper 🇨🇦 668 93 1,702ms 2 Oct 2025 415th Natanaelel 🇸🇪 666 185 203ms 16 days ago 416th olleicua 🇺🇸 664 109 12ms 9 Sep 2025 417th AlephSquirrel 662 172 14ms 25 Jan 2025 418th j2e2 🇪🇸 661 154 24ms 14 Feb 2025 419th Salutations45 660 82 5ms 7 Oct 2025 420th fuzzylojik-golf 🇺🇸 656 121 644ms 6 Jul 2025 421st emgordon154 656 200 217ms 18 Feb 2025 422nd andrewjc2000 654 137 18ms 26 Aug 2025 423rd aliberro39109 649 138 13ms 25 Jan 2025 423rd dokutan 649 138 20ms 31 Jan 2025 425th jared-hughes 646 112 14ms 13 Feb 2025 426th dokutan 644 162 509ms 24 Sep 2025 427th MeWhenI 🇻🇦 641 97 1,508ms 15 Sep 2025 428th MeWhenI 🇻🇦 641 147 151ms 31 Jan 2025 429th tobeannouncd 641 192 191ms 25 Apr 2025 430th gastropner 640 92 392ms 10 Feb 2025 431st Protothor 640 113 17ms 14 days ago 432nd Shanethegamer 🇺🇸 639 141 138ms 6 Feb 2025 433rd the-zammers 638 193 181ms 2 Feb 2025 434th Pyroan 635 141 13ms 15 Feb 2025 434th vhoulbreque 🇫🇷 635 141 13ms 2 Dec 2025 434th FoxInTheClouds 635 141 13ms 7 Feb 2026 437th galloj 🇨🇿 633 68 34ms 30 Jan 2025 438th Shanethegamer 🇺🇸 632 147 395ms 6 Feb 2025 439th targrik 629 115 17ms 5 Feb 2025 440th Shanethegamer 🇺🇸 628 150 124ms 6 Feb 2025 441st madex 🇩🇪 628 152 2ms 9 Feb 2025 442nd MeWhenI 🇻🇦 627 121 1,173ms 8 Jul 2025 443rd gresm 626 143 14ms 30 Jan 2025 444th KatieLG 🇬🇧 625 127 653ms 14 Aug 2025 445th AdrienHache 🇫🇷 624 77 55ms 30 Jan 2025 446th targrik 624 123 56ms 24 Nov 2025 447th madex 🇩🇪 622 144 15ms 31 Jan 2025 447th nooberitess 622 144 15ms 8 Apr 2025 447th neihousaigaai 622 144 16ms 10 Apr 2025 450th Shanethegamer 🇺🇸 621 139 18ms 22 Feb 2025 451st codewrite 🇬🇧 618 145 19ms 15 May 2025 452nd albanian-laundromat 618 338 12ms 17 days ago 453rd MeWhenI 🇻🇦 611 311 1,679ms 10 Feb 2025 454th rucin93 🇵🇱 605 148 12ms 30 Jan 2025 455th kdx2a 600 159 3ms 11 Feb 2025 456th LukeBridges 🇬🇧 598 121 13ms 4 Feb 2025 457th yeminghan2021 598 192 65ms 2 Feb 2025 458th luuumine 🇫🇷 597 150 13ms 31 Oct 2025 459th Shanethegamer 🇺🇸 595 158 7ms 6 Feb 2025 460th IsaacAlexBarden 593 151 22ms 6 Feb 2025 460th OllieBoyne 🇬🇧 593 151 18ms 6 Feb 2025 460th Mabeloid 🇳🇴 593 151 17ms 14 Feb 2025 463rd dokutan 591 148 16ms 31 Jan 2025 464th voytxt 🇨🇿 590 322 1,613ms 1 Feb 2025 465th dmrichwa 🇺🇸 588 123 15ms 31 Jan 2025 466th dokutan 588 129 1,277ms 9 Feb 2025 467th Shanethegamer 🇺🇸 586 107 425ms 26 Jan 2025 468th jatloe 585 153 16ms 17 Mar 2025 469th msbranicky 585 193 9ms 2 Feb 2025 470th MeWhenI 🇻🇦 583 144 434ms 28 Jan 2025 471st elgan65536 🇺🇸 583 225 177ms 14 Feb 2026 472nd GolfingSuccess 🇬🇷 580 144 23ms 31 Jan 2025 473rd dokutan 579 137 538ms 31 Jan 2025 474th CaedenHarper 🇨🇦 577 181 685ms 4 Oct 2025 475th gnlow 🇰🇷 574 126 14ms 11 Feb 2025 475th ShiraJoseph 🇺🇸 574 126 19ms 24 Feb 2025 477th Fracture17 574 156 14ms 12 Feb 2025 478th FlyingPenguin223 573 164 7ms 14 Feb 2025 479th bobbysq 571 157 15ms 4 Mar 2025 479th klixel 🇨🇦 571 157 16ms 19 Jul 2025 First Prev 401–480 of 758 Next Last