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?
Factorial Factorisation 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 Shanethegamer 🇺🇸 570 116 17ms 13 Apr 2024 482nd emgordon154 567 149 2ms 2 Aug 2024 483rd Shanethegamer 🇺🇸 567 188 443ms 13 Apr 2024 484th snydej 565 117 16ms 28 Nov 2024 485th Shanethegamer 🇺🇸 564 194 68ms 4 Oct 2024 486th RYNO8 563 150 2ms 14 Jun 2024 487th snoozingnewt 🇨🇦 561 120 91ms 12 Sep 2025 488th nwellnhof 🇩🇪 561 526 3ms 25 Apr 2024 489th Lv0Sys 🇵🇱 560 118 11ms 23 Feb 2026 490th Salutations45 554 144 10ms 17 Nov 2024 491st KatieLG 🇬🇧 551 115 388ms 28 Oct 2024 492nd m-tkach 🇺🇦 551 120 689ms 14 Apr 2024 492nd ZakkkkAttackkkk 🇵🇭 551 120 706ms 9 Sep 2024 492nd InigoK 🇺🇸 551 120 12ms 10 Sep 2025 495th xyangst 549 206 138ms 18 Oct 2024 496th Shanethegamer 🇺🇸 546 116 435ms 13 Apr 2024 497th davitf 546 121 19ms 30 Apr 2024 497th gallium-gonzollium 546 121 40ms 26 Aug 2024 497th neihousaigaai 546 121 12ms 2 Oct 2024 497th wh3n3v3r 🇨🇿 546 121 26ms 14 Nov 2024 497th fuzzylojik-golf 🇺🇸 546 121 11ms 3 days ago 502nd ei14 544 196 64ms 8 May 2024 503rd CaedenHarper 🇨🇦 542 117 556ms 29 Jul 2025 504th solisolu 542 122 738ms 31 Dec 2025 505th msbranicky 542 196 23ms 20 Jan 2025 506th targrik 539 160 12ms 13 Aug 2025 507th Bulmenisaurus 537 123 17ms 1 Nov 2024 507th CaedenHarper 🇨🇦 537 123 16ms 15 Aug 2025 507th HETHAT 🇩🇿 537 123 16ms 24 Sep 2025 510th m-tkach 🇺🇦 533 119 478ms 14 Apr 2024 511th zakariamouhid 532 162 6ms 13 Apr 2024 512th MeWhenI 🇻🇦 530 178 43ms 29 Apr 2025 513th msbranicky 529 125 12ms 13 Apr 2024 513th guilhem-roy 🇫🇷 529 125 12ms 29 May 2025 513th blaztoma 🇱🇹 529 125 12ms 28 Sep 2025 513th 77Tigers 529 125 16ms 16 Jan 2026 517th msbranicky 529 170 2,574ms 7 Jan 2025 518th HumanoidCPU 528 160 2ms 10 May 2025 519th inventshah 525 126 19ms 15 Apr 2024 519th khaninm 525 126 14ms 3 Jun 2025 521st msbranicky 525 189 389ms 13 Apr 2024 522nd jerrandolph 525 247 276ms 23 Sep 2025 523rd Natanaelel 🇸🇪 522 162 2ms 17 Apr 2024 524th Apataras 522 208 404ms 11 Aug 2025 525th IISResetMe 521 139 2,570ms 27 Nov 2025 526th klixel 🇨🇦 520 127 92ms 8 Apr 2025 527th Shanethegamer 🇺🇸 518 163 3ms 13 Apr 2024 528th rifatx 517 192 437ms 10 Jul 2024 529th thienudomsrirungruang 516 128 343ms 15 Apr 2024 529th mathisfun271 516 128 13ms 1 Jun 2024 529th JunkIce 516 128 17ms 3 Dec 2024 529th cros107 🇦🇺 516 128 15ms 12 Jan 2025 533rd MeWhenI 🇻🇦 516 153 22ms 16 Aug 2024 534th R4z0rX 515 155 28ms 29 Aug 2024 535th hellwue 512 129 11ms 21 Jun 2024 535th StefanHabel 🇨🇦 512 129 15ms 23 days ago 537th CaedenHarper 🇨🇦 512 253 301ms 12 Nov 2025 538th janAkali 🇷🇺 511 226 419ms 31 Jan 2025 539th MeWhenI 🇻🇦 510 132 160ms 28 Oct 2024 540th Artemis21 🇬🇧 508 130 19ms 15 Jan 2025 541st msbranicky 507 125 643ms 13 Apr 2024 542nd LHLaurini 🇧🇷 506 167 3ms 29 Apr 2024 543rd IsaacAlexBarden 505 131 20ms 24 Mar 2025 544th msbranicky 505 211 64ms 14 Apr 2024 545th sultan 505 215 438ms 15 Apr 2024 546th alemelis 503 135 641ms 19 Aug 2024 547th dbut2 🇦🇺 502 258 278ms 16 Jul 2025 548th TobyBoyne 🇬🇧 501 132 667ms 5 Mar 2025 548th RaBa21 🇭🇺 501 132 55ms 17 Jul 2025 550th ei14 500 169 2ms 8 May 2024 551st quimey 497 133 17ms 27 May 2024 551st tobyLovick 497 133 12ms 3 Mar 2025 551st wuduculfre 497 133 12ms 3 Aug 2025 554th JunkIce 495 128 399ms 3 Dec 2024 555th ahmetdemirag 🇨🇾 493 134 602ms 3 Feb 2025 555th madex 🇩🇪 493 134 13ms 1 Jun 2025 555th YAJUE114514 493 134 12ms 27 Jul 2025 555th qpwoeirut 493 134 668ms 10 Aug 2025 559th snoozingnewt 🇨🇦 491 172 3ms 18 Jun 2024 560th FranklinJiaChen 490 135 12ms 30 Jul 2024 First Prev 481–560 of 1,472 Next Last