The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 9 hours. Why not try and solve them ahead of time?
Calendar 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 241st bitsandbeyond 🇳🇱 613 246 6ms 1 Jan 2026 242nd CaedenHarper 🇨🇦 605 329 486ms 26 Dec 2025 243rd ovs-code 🇩🇪 602 142 38ms 19 Dec 2025 244th ovs-code 🇩🇪 601 169 182ms 2 Jan 2026 245th btjones0 596 122 16ms 14 Jan 2026 246th FoxInTheClouds 591 123 16ms 18 Jan 2026 247th NameRandomString 591 278 12ms 30 hours ago 248th ragonscreen 587 199 10ms 17 Jan 2026 248th alexsave 587 199 10ms 20 Jan 2026 250th edsrzf 🇳🇿 586 251 47ms 4 Jan 2026 251st Pianoman1 581 125 16ms 3 Jan 2026 252nd sean-niemann 🇺🇸 581 147 37ms 7 Jan 2026 253rd juliansiebert 🇩🇪 580 142 277ms 22 Feb 2026 254th h3ra993huskp 🇯🇵 580 343 515ms 29 Dec 2025 255th SirBogman 🇺🇸 577 126 16ms 1 Jan 2026 256th edsrzf 🇳🇿 577 249 34ms 2 days ago 257th jerrandolph 576 362 288ms 30 Sep 2025 258th CLOStrophobic 🇮🇹 574 250 18ms 7 May 2025 259th ravnskjaer 🇩🇰 572 348 497ms 3 Jan 2026 260th retrohun 570 288 19ms 30 Dec 2025 261st Bmrl7 568 128 17ms 20 Dec 2025 262nd dokutan 568 228 12ms 3 Feb 2026 263rd AlephSquirrel 568 253 26ms 19 Dec 2025 264th MiffOttah 568 275 417ms 3 Jan 2026 264th mwarvik 🇳🇴 568 275 417ms 4 Jan 2026 266th Lv0Sys 🇵🇱 564 207 14ms 21 Feb 2026 267th warmCabin 564 280 3ms 1 Jan 2026 268th Florian-Mt 563 129 16ms 21 Dec 2025 269th junkondo-jp 561 208 10ms 28 Jan 2026 270th jameswmccarty 550 132 16ms 29 Mar 2025 270th paiv 550 132 16ms 16 Jun 2025 270th jared-hughes 550 132 16ms 26 Dec 2025 270th lelbal 550 132 16ms 16 Jan 2026 274th Andrey-Plotnikov 548 213 10ms 12 Jan 2025 275th helbling 🇨🇭 546 214 10ms 7 Jan 2026 275th weliveinhell 🇭🇹 546 214 10ms 22 Feb 2026 277th Natanaelel 🇸🇪 544 157 41ms 21 Dec 2025 278th CaedenHarper 🇨🇦 543 215 9ms 29 Dec 2025 278th DialFrost 🇸🇬 543 215 9ms 7 Jan 2026 280th martindotexe 🇳🇴 538 135 16ms 25 Dec 2025 281st aliakseikalosha 535 292 464ms 17 Jan 2026 282nd NoneTheFewer 534 136 18ms 26 Dec 2025 283rd croc54 530 137 17ms 7 Feb 2025 283rd celiendonze 🇨🇭 530 137 17ms 6 Jan 2026 285th vhoulbreque 🇫🇷 527 138 17ms 1 Jan 2026 286th CaedenHarper 🇨🇦 526 297 421ms 28 Dec 2025 287th dokutan 526 378 442ms 3 Feb 2026 288th TheZwierzLF 🇵🇱 523 139 16ms 18 Dec 2025 289th targrik 517 226 9ms 9 Apr 2025 290th randolchance 515 141 16ms 13 Jan 2026 290th firegene 🇮🇪 515 141 16ms 20 Feb 2026 292nd IISResetMe 511 161 341ms 25 Dec 2025 293rd nyson 509 307 432ms 17 Jun 2025 294th Protothor 508 230 12ms 25 Dec 2025 295th dokutan 507 384 567ms 4 Feb 2026 296th rustykitty 🇺🇸 501 145 17ms 6 Feb 2026 297th zakariamouhid 499 234 9ms 3 Jan 2026 298th Maltaran 🇵🇱 499 316 3ms 1 Mar 2026 299th Macweese 495 426 1,422ms 1 Jan 2026 300th nstearns96 🇬🇧 494 147 16ms 5 Jan 2026 301st qrakhen 492 318 458ms 22 Dec 2025 302nd Yewzir 🇧🇪 486 429 314ms 1 Mar 2026 303rd Macweese 486 605 44ms 1 Jan 2026 304th snoozingnewt 🇨🇦 483 177 41ms 1 Jan 2026 305th muser-logiccpu 🇺🇦 481 151 16ms 8 Jan 2026 306th codewrite 🇬🇧 481 325 431ms 30 Dec 2025 307th Andriamanitra 🇫🇮 480 178 38ms 1 Jan 2026 308th Macweese 479 524 253ms 1 Jan 2026 309th Jacob385 476 418 399ms 15 Jan 2026 310th denkyuu1 475 180 36ms 6 days ago 311th BambooleanLogic 🇸🇪 471 248 11ms 26 Feb 2026 312th gigaprofisi 🇺🇸 463 252 9ms 31 Dec 2025 313th tomh1012 458 255 11ms 19 days ago 314th madex 🇩🇪 450 361 2,635ms 16 days ago 315th Eulentier161 449 162 17ms 12 Jan 2026 316th Macweese 447 445 510ms 2 Jan 2026 317th MeWhenI 🇻🇦 445 192 38ms 25 Dec 2025 318th olleicua 🇺🇸 443 193 38ms 2 Jan 2026 319th biocommando 🇫🇮 439 266 10ms 7 Jan 2026 320th smclaughlin-cf 432 270 9ms 10 Dec 2025 First Prev 241–320 of 368 Next Last