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 561st aditsu 448 188 4,258ms 10 Aug 2025 562nd kirjavascript 444 163 13ms 14 Feb 2025 563rd kmathis22 442 236 508ms 18 Dec 2025 564th CaedenHarper 🇨🇦 440 191 397ms 17 Oct 2025 565th scpchicken 🇵🇼 439 165 25ms 11 days ago 566th SuperFola 439 352 82ms 10 days ago 567th weliveinhell 🇭🇹 436 166 22ms 18 Jun 2025 568th dokutan 433 194 408ms 1 Feb 2025 569th JunkIce 433 207 15ms 31 Jan 2025 570th snoozingnewt 🇨🇦 432 218 127ms 21 Nov 2025 571st maxgodfrey2004 🇨🇦 430 267 67ms 14 Feb 2025 572nd amazingalek 🇳🇴 426 197 553ms 4 Jan 2026 573rd RedzGoose 🇦🇺 425 211 22ms 10 Feb 2025 574th acollett89 423 171 16ms 14 Jul 2025 575th TheZwierzLF 🇵🇱 419 214 15ms 29 May 2025 576th tomh1012 418 201 459ms 12 Sep 2025 577th denkyuu1 416 121 41ms 30 hours ago 578th tomh1012 416 174 11ms 5 days ago 579th yhm138 415 216 13ms 16 Feb 2025 579th te-chnical 415 216 14ms 1 Jan 2026 581st madeforlosers 414 175 13ms 5 Nov 2025 582nd damagegithub 414 277 70ms 14 Feb 2026 583rd mbittner20 413 217 16ms 24 Feb 2025 583rd aaardwark 413 217 23ms 31 May 2025 585th CaedenHarper 🇨🇦 410 331 336ms 2 Nov 2025 586th blaztoma 🇱🇹 409 215 158ms 28 Nov 2025 587th Maltaran 🇵🇱 409 233 3ms 14 Feb 2025 588th Waffle3z 407 231 3ms 7 Feb 2025 588th Sciman101 407 231 5ms 17 Jan 2026 590th RaBa21 🇭🇺 405 221 13ms 13 Feb 2026 591st Matter1024 🇮🇳 403 125 42ms 14 Feb 2026 592nd EthanJantz 403 222 15ms 10 Aug 2025 593rd adaGrad1 402 223 18ms 3 Aug 2025 594th JOrE20 401 383 27ms 14 Feb 2026 595th aliakseikalosha 400 210 403ms 22 Jun 2025 596th JunkIce 399 199 753ms 31 Jan 2025 597th jerrandolph 397 342 353ms 24 Sep 2025 598th madex 🇩🇪 393 128 39ms 31 Jan 2025 599th tomh1012 393 228 15ms 23 days ago 600th yoshykai 390 268 510ms 30 Mar 2025 601st snoozingnewt 🇨🇦 389 192 134ms 16 Sep 2025 602nd Wonamm 384 233 15ms 14 Feb 2025 602nd TheAtrossian 384 233 12ms 15 Feb 2025 604th JRaspass 🇬🇧 383 119 4ms 3 Feb 2025 605th Mikey-Beep 🇬🇧 381 235 15ms 5 Oct 2025 606th FortuiteMan 🇫🇷 375 239 17ms 7 Jul 2025 607th madex 🇩🇪 372 353 332ms 28 Jan 2025 608th Program-Pi 369 196 15ms 22 days ago 609th IISResetMe 368 160 2,194ms 7 Jan 2026 610th Macweese 368 284 477ms 14 Feb 2026 611th KatieLG 🇬🇧 365 138 55ms 19 Oct 2025 612th Yewzir 🇧🇪 363 247 13ms 6 Feb 2025 613th MiLk 357 251 15ms 19 Feb 2025 614th zakariamouhid 351 206 15ms 8 Mar 2025 615th dokutan 350 328 4,229ms 28 Apr 2025 616th viv511 348 274 2ms 7 Feb 2025 617th Shotokhan 346 259 17ms 25 Sep 2025 618th CaedenHarper 🇨🇦 344 334 63ms 12 Sep 2025 619th ereztaiar 🇮🇱 344 395 316ms 8 Apr 2025 620th MeWhenI 🇻🇦 344 446 27ms 13 Mar 2025 621st blaztoma 🇱🇹 343 224 7ms 22 Sep 2025 622nd robin-scragg 343 261 14ms 11 Jul 2025 623rd Stockoh 🇫🇷 341 263 109ms 13 Feb 2025 624th CaedenHarper 🇨🇦 340 213 18ms 23 Aug 2025 625th Ronterox 338 149 43ms 4 Feb 2026 626th Schmitt-Very-Cool 336 311 705ms 3 Oct 2025 627th gigaprofisi 🇺🇸 334 217 13ms 4 Nov 2025 628th lucasging 333 269 13ms 13 Jun 2025 629th KatieLG 🇬🇧 333 428 14ms 27 Jun 2025 630th Yewzir 🇧🇪 332 239 538ms 7 Feb 2025 631st omero-san 331 271 16ms 26 Sep 2025 632nd HumanoidCPU 327 292 3ms 5 Jun 2025 633rd The-Wolfson 312 302 149ms 5 Feb 2025 634th HumanoidCPU 307 236 14ms 8 Feb 2025 635th Nikinator2704 306 293 12ms 1 Nov 2025 636th CarterStroik 306 307 4ms 13 Nov 2025 637th CaedenHarper 🇨🇦 306 312 3ms 12 Sep 2025 638th TheZwierzLF 🇵🇱 305 165 51ms 6 Jan 2026 639th vroup 🇩🇰 302 278 502ms 18 Aug 2025 640th HumanoidCPU 295 304 15ms 26 Jan 2025 First Prev 561–640 of 759 Next Last