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 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 481st alexsave 523 137 25ms 8 Oct 2025 482nd wobblybits 522 133 18ms 15 Aug 2025 483rd Salutations45 520 138 14ms 13 Feb 2025 484th xyangst 516 139 23ms 14 Feb 2025 485th Shanethegamer 🇺🇸 514 153 404ms 31 Jan 2025 486th RaBa21 🇭🇺 511 136 14ms 12 Jul 2025 487th isaiah0311 🇺🇸 508 186 3ms 1 Feb 2026 488th andrewjc2000 507 137 18ms 26 Aug 2025 489th prestosilver 🇺🇸 506 181 402ms 2 days ago 490th aliberro39109 503 138 13ms 25 Jan 2025 491st MeWhenI 🇻🇦 502 514 83ms 13 Mar 2025 492nd Shanethegamer 🇺🇸 500 92 40ms 17 Jan 2025 493rd evan18c 499 139 16ms 16 Apr 2025 494th MeWhenI 🇻🇦 499 339 5ms 29 Jan 2025 495th junkondo-jp 498 144 21ms 8 Feb 2026 496th JunkIce 492 129 481ms 31 Jan 2025 497th Pyroan 492 141 13ms 15 Feb 2025 497th vhoulbreque 🇫🇷 492 141 13ms 2 Dec 2025 497th FoxInTheClouds 492 141 13ms 7 Feb 2026 500th albanian-laundromat 489 108 48ms 25 Feb 2026 501st elttil 487 194 2ms 13 Feb 2025 502nd gresm 486 143 14ms 30 Jan 2025 502nd OllieBoyne 🇬🇧 486 143 18ms 6 Feb 2025 504th Maltaran 🇵🇱 484 235 475ms 14 Feb 2025 505th madex 🇩🇪 482 144 15ms 31 Jan 2025 505th nooberitess 482 144 15ms 8 Apr 2025 505th neihousaigaai 482 144 16ms 10 Apr 2025 508th Feniske 🇫🇷 481 120 506ms 10 Feb 2025 509th KatieLG 🇬🇧 479 96 42ms 7 Jan 2026 510th codewrite 🇬🇧 479 145 19ms 15 May 2025 511th Chinay-Domitrix 🇺🇸 477 174 4,473ms 25 days ago 512th MeWhenI 🇻🇦 476 436 12ms 27 Jul 2025 513th wuminws 474 175 4,261ms 19 Feb 2025 514th viv511 468 243 477ms 13 Feb 2025 515th Pyroan 466 160 244ms 15 Feb 2025 516th TheZwierzLF 🇵🇱 464 137 1,078ms 25 Nov 2025 517th Shanethegamer 🇺🇸 464 163 15ms 16 Feb 2025 518th heanyang1 461 205 2ms 3 Jun 2025 519th IsaacAlexBarden 460 151 22ms 6 Feb 2025 519th Mabeloid 🇳🇴 460 151 17ms 14 Feb 2025 521st janAkali 🇷🇺 458 200 417ms 14 Feb 2026 522nd jatloe 454 153 16ms 17 Mar 2025 523rd Robvdhout 454 158 16ms 10 Apr 2025 524th iczelia 🇩🇪 451 159 18ms 25 Oct 2025 525th msbranicky 449 185 4,393ms 2 Feb 2025 526th HumanoidCPU 448 160 20ms 21 Feb 2025 527th Ripick 447 205 397ms 15 Apr 2025 528th Fracture17 445 156 14ms 12 Feb 2025 528th robin-scragg 445 156 14ms 11 Jul 2025 530th bobbysq 442 157 15ms 4 Mar 2025 530th klixel 🇨🇦 442 157 16ms 19 Jul 2025 532nd aditsu 442 188 4,258ms 10 Aug 2025 533rd kirjavascript 440 163 13ms 14 Feb 2025 534th starfihs 439 158 21ms 10 Feb 2025 535th kmathis22 438 236 508ms 18 Dec 2025 536th scpchicken 🇵🇼 437 159 15ms 9 days ago 537th scpchicken 🇵🇼 435 165 25ms 9 days ago 538th weliveinhell 🇭🇹 432 166 22ms 18 Jun 2025 539th croc54 431 161 13ms 31 Jan 2025 539th netfri25 🇮🇱 431 161 21ms 20 Feb 2026 541st SuperFola 428 352 82ms 8 days ago 542nd PotatoSaladOverlord 426 163 12ms 14 Feb 2026 543rd snoozingnewt 🇨🇦 426 218 127ms 21 Nov 2025 544th maxgodfrey2004 🇨🇦 426 267 67ms 14 Feb 2025 545th acollett89 419 171 16ms 14 Jul 2025 546th noanabeshima 418 166 13ms 9 Jul 2025 546th yokasuretsu 418 166 15ms 11 Jul 2025 548th CutSandstone 413 168 21ms 30 Jan 2025 548th sciencejiho 413 168 15ms 10 Feb 2025 548th dirckvdende 413 168 14ms 17 Jul 2025 551st tomh1012 412 174 11ms 3 days ago 552nd CaedenHarper 🇨🇦 412 191 397ms 17 Oct 2025 553rd jameswmccarty 411 169 15ms 9 Feb 2025 554th damagegithub 411 277 70ms 14 Feb 2026 555th madeforlosers 410 175 13ms 5 Nov 2025 556th hiichbindermax 408 170 14ms 5 Feb 2025 557th CaedenHarper 🇨🇦 407 331 336ms 2 Nov 2025 558th Maltaran 🇵🇱 406 233 3ms 14 Feb 2025 559th dokutan 405 194 408ms 1 Feb 2025 560th 77Tigers 404 172 13ms 13 Jan 2026 First Prev 481–560 of 754 Next Last