The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Factorial Factorisation 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 481st ahmetdemirag 🇨🇾 621 134 602ms 3 Feb 2025 481st madex 🇩🇪 621 134 13ms 1 Jun 2025 481st YAJUE114514 621 134 12ms 27 Jul 2025 481st qpwoeirut 621 134 668ms 10 Aug 2025 485th GolfingSuccess 🇬🇷 620 128 110ms 16 Aug 2024 486th Maznek 620 129 11ms 29 Apr 2024 486th wansacis 🇩🇪 620 129 14ms 30 Apr 2024 488th Shanethegamer 🇺🇸 619 210 282ms 14 Apr 2024 489th arcpolaris 618 161 388ms 11 Dec 2024 490th niklv 🇷🇺 616 130 13ms 14 Apr 2024 490th two-bad 🇬🇧 616 130 11ms 4 May 2024 490th GeorgeStechman 🇬🇧 616 130 13ms 4 May 2024 490th didion0 🇺🇸 616 130 14ms 26 Aug 2025 494th FranklinJiaChen 616 135 12ms 30 Jul 2024 495th moustave 612 136 12ms 25 Mar 2025 496th msbranicky 612 145 157ms 13 Apr 2024 497th emgordon154 611 130 365ms 5 Sep 2024 498th iczelia 🇩🇪 610 139 1ms 22 Sep 2025 499th snoozingnewt 🇨🇦 608 120 91ms 12 Sep 2025 500th MeWhenI 🇻🇦 608 131 513ms 24 May 2024 501st galloj 🇨🇿 607 137 14ms 13 Apr 2024 501st Rubiksmath 607 137 16ms 29 Sep 2024 501st andrewjc2000 607 137 2,636ms 28 Jul 2025 501st SectorCorruptor 607 137 19ms 21 Sep 2025 505th AutumnWind75 607 176 422ms 10 Dec 2025 506th madex 🇩🇪 606 140 2ms 9 Jun 2025 507th luuumine 🇫🇷 606 187 134ms 8 Dec 2025 508th yoshykai 605 180 423ms 29 Mar 2025 508th h3ra993huskp 🇯🇵 605 180 475ms 30 Nov 2025 510th lelbal 603 138 16ms 16 Feb 2026 511th CaedenHarper 🇨🇦 603 165 389ms 21 Oct 2025 512th HumanoidCPU 602 133 13ms 9 May 2025 512th Ultra814 602 133 14ms 19 Aug 2025 512th alexsave 602 133 11ms 18 Jan 2026 515th iczelia 🇩🇪 597 134 14ms 26 Sep 2025 516th TeodorDyakov 🇧🇬 597 142 2ms 31 Mar 2025 517th gjoacorp 🇬🇧 597 179 73ms 4 Aug 2025 518th CutSandstone 594 140 12ms 19 Jul 2024 519th Shanethegamer 🇺🇸 594 285 1,459ms 29 Jan 2025 520th MeWhenI 🇻🇦 593 187 437ms 17 Apr 2024 521st beergit 591 116 44ms 7 Aug 2024 522nd msbranicky 591 148 14ms 18 Apr 2024 523rd commandz0 🇺🇸 590 141 69ms 13 Apr 2024 523rd Pyroan 590 141 37ms 16 Apr 2025 523rd CommandLeo 🇮🇹 590 141 22ms 19 Nov 2025 523rd Bmrl7 590 141 16ms 22 Dec 2025 527th Chinay-Domitrix 🇺🇸 587 154 2,824ms 16 Apr 2025 528th IISResetMe 586 139 2,570ms 27 Nov 2025 529th sultan 586 170 403ms 15 Apr 2024 530th m-tkach 🇺🇦 585 145 3ms 1 May 2024 531st msbranicky 585 173 7ms 14 Apr 2024 532nd acollett89 584 137 12ms 4 Aug 2025 533rd msbranicky 583 217 37ms 20 Apr 2024 534th RYNO8 582 143 67ms 14 Jun 2024 534th OllieBoyne 🇬🇧 582 143 21ms 5 Mar 2025 534th BREMAUCY 🇫🇷 582 143 681ms 24 Jul 2025 534th kistlerf 🇨🇭 582 143 12ms 8 Nov 2025 534th Emutis 🇱🇹 582 143 13ms 12 Nov 2025 539th lifthrasiir 🇰🇷 582 306 8ms 19 Dec 2024 540th stefangimmillaro 581 790 1ms 6 Nov 2025 541st jiaminglimjm 🇲🇾 578 144 12ms 6 Jul 2024 542nd Andrey135296 574 145 51ms 9 Nov 2024 543rd commandz0 🇺🇸 573 139 771ms 1 Sep 2025 544th AarSeBail 573 198 149ms 29 Jun 2025 545th thisishowmymindworks 🇳🇴 572 140 22ms 27 Jun 2024 546th MeWhenI 🇻🇦 572 189 41ms 31 Aug 2024 547th ThijsLuttikhuis 570 146 16ms 13 Apr 2024 547th SB-945 570 146 19ms 15 Apr 2024 547th mbittner20 570 146 14ms 30 Jun 2024 547th scpchicken 🇵🇼 570 146 16ms 31 Jul 2024 547th Babafaba 570 146 739ms 17 Nov 2025 552nd emgordon154 569 149 2ms 2 Aug 2024 553rd Shanethegamer 🇺🇸 569 188 443ms 13 Apr 2024 554th JOrE20 566 147 10ms 7 Dec 2025 555th Shanethegamer 🇺🇸 566 194 68ms 4 Oct 2024 556th RYNO8 565 150 2ms 14 Jun 2024 557th adoxography 562 122 46ms 27 Apr 2024 558th dokutan 561 142 683ms 16 Jun 2024 559th gsprochette 559 149 19ms 21 Aug 2025 560th Salutations45 556 144 10ms 17 Nov 2024 First Prev 481–560 of 1,485 Next Last