The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 480th klixel 🇨🇦 571 157 16ms 19 Jul 2025 482nd Shanethegamer 🇺🇸 570 95 1,681ms 17 Jan 2025 483rd madex 🇩🇪 570 127 14ms 10 Feb 2025 484th starfihs 567 158 21ms 10 Feb 2025 485th h3ra993huskp 🇯🇵 567 184 686ms 30 Nov 2025 486th scpchicken 🇵🇼 563 159 15ms 11 days ago 487th martindotexe 🇳🇴 560 160 13ms 14 Feb 2025 488th dokutan 557 130 14ms 31 Jan 2025 489th croc54 556 161 13ms 31 Jan 2025 489th netfri25 🇮🇱 556 161 21ms 20 Feb 2026 491st The3gs 556 236 178ms 26 Jan 2025 492nd MeWhenI 🇻🇦 553 241 33ms 29 Apr 2025 493rd PotatoSaladOverlord 550 163 12ms 14 Feb 2026 494th Shanethegamer 🇺🇸 549 153 404ms 31 Jan 2025 495th Shanethegamer 🇺🇸 547 92 40ms 17 Jan 2025 496th MeWhenI 🇻🇦 547 99 10ms 27 Jan 2025 497th TheZwierzLF 🇵🇱 547 145 1,154ms 14 Dec 2025 498th Babafaba 543 165 23ms 4 Nov 2025 499th FlorianCassayre 🇫🇷 540 166 21ms 31 Jan 2025 499th noanabeshima 540 166 13ms 9 Jul 2025 499th yokasuretsu 540 166 15ms 11 Jul 2025 502nd JDiLenarda 🇫🇷 538 222 1,343ms 26 Jun 2025 503rd Shanethegamer 🇺🇸 537 163 15ms 16 Feb 2025 504th keegan-t 🇨🇦 536 167 15ms 16 Apr 2025 504th evan18c 536 167 16ms 16 Apr 2025 506th Shanethegamer 🇺🇸 534 142 1,157ms 9 Feb 2025 507th CutSandstone 533 168 21ms 30 Jan 2025 507th sciencejiho 533 168 15ms 10 Feb 2025 507th dirckvdende 533 168 14ms 17 Jul 2025 510th jameswmccarty 530 169 15ms 9 Feb 2025 511th prestosilver 🇺🇸 530 180 3ms 17 Nov 2025 512th alexsave 528 137 25ms 8 Oct 2025 513th dokutan 527 144 165ms 31 Jan 2025 514th hiichbindermax 527 170 14ms 5 Feb 2025 515th Salutations45 524 138 14ms 13 Feb 2025 516th xyangst 521 139 23ms 14 Feb 2025 517th 77Tigers 521 172 13ms 13 Jan 2026 517th SectorCorruptor 521 172 14ms 16 days ago 519th YAJUE114514 518 173 19ms 30 Jul 2025 519th aalec 518 173 14ms 8 Nov 2025 521st JOrE20 517 140 13ms 14 Feb 2026 522nd prestosilver 🇺🇸 513 181 402ms 4 days ago 523rd isaiah0311 🇺🇸 513 186 3ms 1 Feb 2026 524th nstearns96 🇬🇧 512 175 16ms 4 Feb 2025 525th Babafaba 509 156 621ms 4 Nov 2025 526th NerdyMcNerd42 509 176 13ms 20 Feb 2025 527th CatsAreFluffy 506 95 61ms 22 Feb 2025 528th MeWhenI 🇻🇦 505 514 83ms 13 Mar 2025 529th MeWhenI 🇻🇦 504 339 5ms 29 Jan 2025 530th junkondo-jp 503 144 21ms 8 Feb 2026 531st nemoyatpeace 503 178 13ms 13 Jan 2026 532nd albanian-laundromat 501 108 48ms 25 Feb 2026 533rd CarsonChr 🇺🇸 500 179 14ms 31 Jan 2025 534th gastropner 495 181 23ms 10 Feb 2025 535th JOrE20 492 182 14ms 29 Jan 2026 536th elttil 492 194 2ms 13 Feb 2025 537th Feniske 🇫🇷 491 120 506ms 10 Feb 2025 538th Maltaran 🇵🇱 488 235 475ms 14 Feb 2025 539th Chinay-Domitrix 🇺🇸 484 174 4,473ms 27 days ago 540th wuminws 481 175 4,261ms 19 Feb 2025 541st tatzyr 🇯🇵 479 105 41ms 26 Mar 2025 542nd adamnielson42 🇺🇸 479 187 14ms 10 Feb 2025 543rd MeWhenI 🇻🇦 479 436 12ms 27 Jul 2025 544th Pyroan 474 160 244ms 15 Feb 2025 545th viv511 472 243 477ms 13 Feb 2025 546th Alban-Boissard 471 190 16ms 14 Jun 2025 547th davidludwik2370 469 191 13ms 31 Jul 2025 547th To5BG 469 191 16ms 16 Nov 2025 549th heanyang1 465 205 2ms 3 Jun 2025 550th dokutan 464 134 1,392ms 30 Aug 2025 551st janAkali 🇷🇺 464 200 417ms 14 Feb 2026 552nd michaelhodel 462 194 14ms 16 Nov 2025 553rd msbranicky 459 195 16ms 1 Feb 2025 554th Robvdhout 458 158 16ms 10 Apr 2025 555th iczelia 🇩🇪 455 159 18ms 25 Oct 2025 556th msbranicky 455 185 4,393ms 2 Feb 2025 557th Ripick 453 205 397ms 15 Apr 2025 558th AstroOrbis 452 198 20ms 10 Feb 2026 558th Andrey2001 452 198 14ms 14 Feb 2026 558th Aquateraneal 🇺🇸 452 198 14ms 22 days ago First Prev 481–560 of 759 Next Last