The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 321st Shanethegamer 🇺🇸 767 99 181ms 16 Jan 2025 322nd sisyphus-ppcg 🇦🇺 767 100 6ms 3 Feb 2025 323rd edsrzf 🇳🇿 767 177 314ms 4 days ago 324th MeWhenI 🇻🇦 766 109 141ms 31 Jan 2025 325th plcc0 766 117 13ms 25 Feb 2025 325th KatieLG 🇬🇧 766 117 13ms 19 Oct 2025 325th 051 🇸🇬 766 117 13ms 11 Jan 2026 328th commandz0 🇺🇸 763 104 629ms 1 Sep 2025 329th albanian-laundromat 763 148 14ms 27 Jul 2025 330th frosster 🇨🇦 758 124 11ms 11 Feb 2026 331st emgordon154 756 105 535ms 27 Jan 2025 331st DialFrost 🇸🇬 756 105 465ms 27 Jan 2025 333rd retrohun 755 57 34ms 3 Feb 2025 334th Shanethegamer 🇺🇸 754 96 16ms 16 Jan 2025 335th davecame 753 119 21ms 5 Feb 2025 335th snoozingnewt 🇨🇦 753 119 20ms 22 Dec 2025 337th edsrzf 🇳🇿 751 101 217ms 21 Aug 2025 338th gastropner 751 127 3ms 10 Feb 2025 339th tailorspy 750 153 65ms 13 Mar 2025 340th moustave 746 120 19ms 12 Feb 2025 340th firegene 🇮🇪 746 120 13ms 9 Feb 2026 340th Flekay 🇩🇪 746 120 20ms 19 Feb 2026 343rd stefangimmillaro 746 176 180ms 31 Jan 2025 344th kkoenig 745 128 3ms 5 Sep 2025 345th primo-ppcg 🇹🇭 744 96 53ms 3 Aug 2025 346th error256 742 58 47ms 26 Jan 2025 347th anter69 🇭🇺 740 68 37ms 31 Jan 2025 347th Andriamanitra 🇫🇮 740 68 37ms 14 Feb 2025 347th olleicua 🇺🇸 740 68 38ms 9 Mar 2025 350th Shanethegamer 🇺🇸 740 121 17ms 9 Jan 2025 351st JohandeRuiter 🇳🇱 740 129 3ms 10 Feb 2025 352nd Shanethegamer 🇺🇸 739 128 175ms 24 May 2025 353rd m-tkach 🇺🇦 738 208 29ms 26 Jun 2025 354th Shanethegamer 🇺🇸 737 162 1,384ms 17 Jan 2025 355th MeWhenI 🇻🇦 734 76 9ms 13 Jul 2025 356th chartung17 734 122 14ms 24 Mar 2025 356th souta-1326 734 122 14ms 27 Mar 2025 356th CaedenHarper 🇨🇦 734 122 13ms 20 Jul 2025 359th MeWhenI 🇻🇦 734 185 413ms 31 Jan 2025 360th kg583 🇺🇸 733 200 45ms 9 Feb 2026 361st InigoK 🇺🇸 728 123 18ms 7 Sep 2025 362nd DialFrost 🇸🇬 725 116 4,096ms 30 Jan 2025 363rd duckyluuk 🇳🇱 723 100 15ms 14 Feb 2025 364th anter69 🇭🇺 722 75 1,627ms 6 days ago 365th ImpressedByRocks 722 124 52ms 12 Feb 2025 366th Shanethegamer 🇺🇸 721 110 534ms 17 Jan 2025 367th HETHAT 🇩🇿 717 125 15ms 30 Jan 2025 367th albanian-laundromat 717 125 17ms 27 Jul 2025 367th StefanHabel 🇨🇦 717 125 12ms 22 days ago 370th nullie 717 183 234ms 20 Feb 2025 371st snoozingnewt 🇨🇦 715 111 495ms 22 Dec 2025 372nd albanian-laundromat 715 190 352ms 8 Dec 2025 373rd gastropner 713 161 71ms 10 Feb 2025 374th AlephSquirrel 712 191 4ms 19 May 2025 375th cros107 🇦🇺 711 126 21ms 25 Jul 2025 375th retrohun 711 126 20ms 6 Nov 2025 375th guilhem-roy 🇫🇷 711 126 22ms 22 Nov 2025 378th snoozingnewt 🇨🇦 709 71 37ms 13 days ago 379th Shanethegamer 🇺🇸 709 188 31ms 14 Mar 2025 380th solisolu 707 135 3ms 14 Feb 2026 381st Shanethegamer 🇺🇸 704 270 1,589ms 31 Jan 2025 382nd CaedenHarper 🇨🇦 702 113 651ms 20 Jul 2025 383rd retrohun 700 102 468ms 14 Feb 2025 384th MeWhenI 🇻🇦 700 217 1,811ms 7 Nov 2025 385th SirBogman 🇺🇸 698 70 40ms 5 Feb 2025 386th Andrey-Plotnikov 696 104 17ms 29 May 2025 387th MeWhenI 🇻🇦 696 165 479ms 29 Jan 2025 388th dokutan 694 62 35ms 31 Jan 2025 389th KasperKivimaeki 🇫🇮 694 129 13ms 6 Jul 2025 389th BrunoVisnadi 🇧🇷 694 129 587ms 15 Feb 2026 389th Openstreetmapler 694 129 18ms 21 days ago 392nd MeWhenI 🇻🇦 693 163 13ms 8 Jul 2025 393rd DialFrost 🇸🇬 691 66 4ms 27 Jan 2025 394th ndren 690 115 599ms 20 Jul 2025 395th fuzzylojik-golf 🇺🇸 689 130 14ms 13 Jun 2025 396th rucin93 🇵🇱 688 122 420ms 25 Jul 2025 397th Shanethegamer 🇺🇸 686 198 387ms 31 Jan 2025 398th CaedenHarper 🇨🇦 685 54 58ms 24 Oct 2025 399th rollershutter 679 132 17ms 26 Mar 2025 400th Shanethegamer 🇺🇸 679 153 485ms 16 Feb 2025 First Prev 321–400 of 756 Next Last