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 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 561st msbranicky 490 176 8ms 16 Apr 2024 562nd brimstonetrader 489 211 202ms 16 Apr 2024 563rd beergit 487 116 44ms 7 Aug 2024 564th mousetail 🇳🇱 487 117 80ms 13 Apr 2024 565th moustave 486 136 12ms 25 Mar 2025 566th msbranicky 486 174 2ms 14 Apr 2024 566th yuchuehw 486 174 3ms 12 Jun 2024 568th MeWhenI 🇻🇦 484 131 513ms 24 May 2024 569th galloj 🇨🇿 482 137 14ms 13 Apr 2024 569th Rubiksmath 482 137 16ms 29 Sep 2024 569th andrewjc2000 482 137 2,636ms 28 Jul 2025 569th SectorCorruptor 482 137 19ms 21 Sep 2025 573rd emgordon154 481 307 769ms 10 Jun 2025 574th madex 🇩🇪 480 166 11ms 6 Jun 2024 575th lelbal 479 138 16ms 16 Feb 2026 576th msbranicky 479 220 130ms 17 Apr 2024 577th plastic-bottle 474 229 409ms 27 Aug 2025 578th CutSandstone 472 140 12ms 19 Jul 2024 579th snoozingnewt 🇨🇦 472 169 13ms 9 Oct 2025 580th tobeannouncd 472 219 221ms 29 Apr 2024 581st kevinnaviapaiva 471 392 25ms 28 Feb 2025 582nd CaedenHarper 🇨🇦 470 231 543ms 8 Oct 2025 583rd commandz0 🇺🇸 469 141 69ms 13 Apr 2024 583rd Pyroan 469 141 37ms 16 Apr 2025 583rd CommandLeo 🇮🇹 469 141 22ms 19 Nov 2025 583rd Bmrl7 469 141 16ms 22 Dec 2025 587th Kokusui 🇯🇵 469 184 756ms 18 Jun 2024 588th targrik 466 171 15ms 14 Feb 2025 589th TanguyBarthelemy 465 145 154ms 24 Oct 2024 590th msbranicky 464 172 11ms 21 Apr 2024 591st adoxography 463 122 46ms 27 Apr 2024 592nd msbranicky 463 167 21ms 18 Apr 2024 593rd RYNO8 462 143 67ms 14 Jun 2024 593rd OllieBoyne 🇬🇧 462 143 21ms 5 Mar 2025 593rd BREMAUCY 🇫🇷 462 143 681ms 24 Jul 2025 593rd kistlerf 🇨🇭 462 143 12ms 8 Nov 2025 593rd Emutis 🇱🇹 462 143 13ms 12 Nov 2025 598th msbranicky 462 167 1,188ms 16 Apr 2024 599th Sp3000 🇦🇺 459 124 36ms 31 May 2024 600th jiaminglimjm 🇲🇾 459 144 12ms 6 Jul 2024 601st commandz0 🇺🇸 456 139 771ms 1 Sep 2025 602nd Andrey135296 456 145 51ms 9 Nov 2024 603rd ThijsLuttikhuis 453 146 16ms 13 Apr 2024 603rd mbittner20 453 146 14ms 30 Jun 2024 603rd scpchicken 🇵🇼 453 146 16ms 31 Jul 2024 606th Natanaelel 🇸🇪 452 87 19ms 16 Apr 2024 607th JOrE20 450 147 10ms 7 Dec 2025 608th msbranicky 450 217 37ms 20 Apr 2024 609th dokutan 449 287 2ms 26 Dec 2025 610th retrohun 448 659 1ms 23 Aug 2025 611th gsprochette 444 149 19ms 21 Aug 2025 612th msbranicky 443 245 414ms 21 Apr 2024 613th inventshah 442 668 2ms 19 Apr 2024 614th jtaxen 441 150 93ms 14 Apr 2024 615th MeWhenI 🇻🇦 440 671 1ms 22 Apr 2024 616th EnTerr 438 151 24ms 16 Jun 2024 616th dirckvdende 438 151 20ms 23 Jul 2025 618th agreegious 435 152 15ms 17 Nov 2024 619th kasarino 435 236 43ms 3 Feb 2026 620th shelerr 429 154 34ms 21 Aug 2025 620th mathieurodic 429 154 943ms 28 Oct 2025 622nd Ripick 428 270 369ms 15 Aug 2024 623rd galloj 🇨🇿 427 691 1ms 16 Apr 2024 624th WillowWispy 426 155 17ms 25 May 2025 625th blaztoma 🇱🇹 424 160 293ms 12 Oct 2025 626th dokutan 422 161 602ms 20 Jun 2024 627th luuumine 🇫🇷 421 157 15ms 1 Dec 2025 627th kitotch 421 157 31ms 5 days ago 629th msbranicky 421 237 2,650ms 18 Apr 2024 630th dokutan 421 701 1ms 22 Apr 2024 631st stertooy 🇧🇪 418 158 21ms 14 Jun 2024 631st codingisgreatbutiamnot 418 158 12ms 6 Jul 2025 633rd ei14 418 706 1ms 8 May 2024 634th sacredeux 416 159 16ms 27 Aug 2024 634th hiichbindermax 416 159 23ms 11 Sep 2024 636th dokutan 415 201 75ms 23 Jan 2026 637th inverseLorentz 🇦🇺 413 160 21ms 24 Jun 2024 638th kasarino 412 205 2ms 3 Feb 2026 639th Natanaelel 🇸🇪 411 161 22ms 15 Apr 2024 639th CatsAreFluffy 411 161 42ms 29 Apr 2024 First Prev 561–640 of 1,472 Next Last