The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 kmathis22 442 236 508ms 18 Dec 2025 562nd scpchicken 🇵🇼 439 165 15ms 6 days ago 563rd CaedenHarper 🇨🇦 439 191 397ms 17 Oct 2025 564th weliveinhell 🇭🇹 436 166 25ms 18 Jun 2025 565th JunkIce 433 207 15ms 31 Jan 2025 566th SuperFola 433 352 97ms 5 days ago 567th dokutan 432 194 408ms 1 Feb 2025 568th snoozingnewt 🇨🇦 432 218 121ms 21 Nov 2025 569th maxgodfrey2004 🇨🇦 430 267 67ms 14 Feb 2025 570th amazingalek 🇳🇴 426 197 553ms 4 Jan 2026 571st RedzGoose 🇦🇺 425 211 22ms 10 Feb 2025 572nd acollett89 423 171 12ms 14 Jul 2025 573rd aksyristos 419 214 14ms 21 Mar 2025 573rd TheZwierzLF 🇵🇱 419 214 15ms 29 May 2025 575th tomh1012 417 201 459ms 12 Sep 2025 576th tomh1012 416 174 12ms 17 hours ago 577th yhm138 415 216 13ms 16 Feb 2025 577th te-chnical 415 216 14ms 1 Jan 2026 579th madeforlosers 414 175 14ms 5 Nov 2025 580th damagegithub 414 277 70ms 14 Feb 2026 581st mbittner20 413 217 16ms 24 Feb 2025 581st aaardwark 413 217 23ms 31 May 2025 583rd CaedenHarper 🇨🇦 410 331 336ms 2 Nov 2025 584th blaztoma 🇱🇹 409 215 158ms 28 Nov 2025 585th Maltaran 🇵🇱 409 233 3ms 14 Feb 2025 586th Waffle3z 407 231 3ms 7 Feb 2025 586th Sciman101 407 231 5ms 17 Jan 2026 588th RaBa21 🇭🇺 405 221 13ms 13 Feb 2026 589th Matter1024 🇮🇳 403 125 42ms 14 Feb 2026 590th EthanJantz 403 222 15ms 10 Aug 2025 591st adaGrad1 402 223 18ms 3 Aug 2025 592nd JOrE20 401 383 27ms 14 Feb 2026 593rd JunkIce 399 199 753ms 31 Jan 2025 594th aliakseikalosha 399 210 403ms 22 Jun 2025 595th jerrandolph 397 342 353ms 24 Sep 2025 596th madex 🇩🇪 393 128 39ms 31 Jan 2025 597th tomh1012 393 228 15ms 18 days ago 598th yoshykai 390 268 510ms 30 Mar 2025 599th snoozingnewt 🇨🇦 389 192 134ms 16 Sep 2025 600th Wonamm 384 233 15ms 14 Feb 2025 600th TheAtrossian 384 233 12ms 15 Feb 2025 602nd JRaspass 🇬🇧 383 119 4ms 3 Feb 2025 603rd Mikey-Beep 🇬🇧 381 235 15ms 5 Oct 2025 604th denkyuu1 378 133 54ms 8 days ago 605th FortuiteMan 🇫🇷 375 239 17ms 7 Jul 2025 606th madex 🇩🇪 372 353 325ms 28 Jan 2025 607th Program-Pi 369 196 20ms 17 days ago 608th IISResetMe 368 160 2,194ms 7 Jan 2026 609th Macweese 368 284 477ms 14 Feb 2026 610th KatieLG 🇬🇧 365 138 55ms 19 Oct 2025 611th Yewzir 🇧🇪 363 247 13ms 6 Feb 2025 612th MiLk 357 251 15ms 19 Feb 2025 613th zakariamouhid 351 206 17ms 8 Mar 2025 614th dokutan 350 328 4,229ms 28 Apr 2025 615th viv511 348 274 2ms 7 Feb 2025 616th Shotokhan 346 259 17ms 25 Sep 2025 617th CaedenHarper 🇨🇦 344 334 63ms 12 Sep 2025 618th ereztaiar 🇮🇱 344 395 316ms 8 Apr 2025 619th MeWhenI 🇻🇦 344 446 27ms 13 Mar 2025 620th blaztoma 🇱🇹 343 224 7ms 22 Sep 2025 621st robin-scragg 343 261 14ms 11 Jul 2025 622nd Stockoh 🇫🇷 341 263 109ms 13 Feb 2025 623rd CaedenHarper 🇨🇦 340 213 13ms 23 Aug 2025 624th Ronterox 338 149 43ms 4 Feb 2026 625th Schmitt-Very-Cool 336 311 705ms 3 Oct 2025 626th gigaprofisi 🇺🇸 334 217 14ms 4 Nov 2025 627th lucasging 333 269 13ms 13 Jun 2025 628th KatieLG 🇬🇧 333 428 14ms 27 Jun 2025 629th Yewzir 🇧🇪 332 239 538ms 7 Feb 2025 630th omero-san 331 271 16ms 26 Sep 2025 631st HumanoidCPU 327 292 3ms 5 Jun 2025 632nd The-Wolfson 312 302 110ms 5 Feb 2025 633rd HumanoidCPU 307 236 15ms 8 Feb 2025 634th Nikinator2704 306 293 12ms 1 Nov 2025 635th CarterStroik 306 307 4ms 13 Nov 2025 636th CaedenHarper 🇨🇦 306 312 3ms 12 Sep 2025 637th TheZwierzLF 🇵🇱 305 165 51ms 6 Jan 2026 638th vroup 🇩🇰 302 278 502ms 18 Aug 2025 639th HumanoidCPU 295 304 15ms 26 Jan 2025 640th JOrE20 284 177 41ms 2 Feb 2026 First Prev 561–640 of 757 Next Last