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?
Calendar 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 241st pardouin 🇫🇷 689 236 2,851ms 15 Feb 2026 242nd vhoulbreque 🇫🇷 688 138 17ms 1 Jan 2026 243rd madex 🇩🇪 686 230 3ms 22 Dec 2025 244th bitsandbeyond 🇳🇱 684 239 4ms 1 Jan 2026 245th TheZwierzLF 🇵🇱 683 139 16ms 18 Dec 2025 246th tomh1012 683 229 525ms 22 Dec 2025 247th sean-niemann 🇺🇸 680 163 3ms 8 Jan 2026 248th Chinay-Domitrix 🇺🇸 680 239 2,674ms 11 days ago 249th madeforlosers 679 225 12ms 9 Jan 2026 250th anter69 🇭🇺 677 245 180ms 17 Feb 2026 251st CLOStrophobic 🇮🇹 677 250 18ms 7 May 2025 252nd kmathis22 677 294 407ms 19 Dec 2025 253rd targrik 676 226 11ms 9 Apr 2025 254th randolchance 673 141 16ms 13 Jan 2026 254th firegene 🇮🇪 673 141 16ms 20 Feb 2026 256th edsrzf 🇳🇿 672 342 10ms 11 days ago 257th AlephSquirrel 669 253 26ms 19 Dec 2025 257th edsrzf 🇳🇿 669 253 34ms 4 Jan 2026 259th JOrE20 667 229 11ms 5 Feb 2026 260th stackofbears 666 345 272ms 31 Dec 2025 261st Protothor 664 230 12ms 25 Dec 2025 262nd bac0id 660 237 441ms 30 Jan 2026 263rd rucin93 🇵🇱 659 302 473ms 2 Jan 2026 264th bac0id 657 274 466ms 30 Jan 2026 265th rustykitty 🇺🇸 655 145 17ms 6 Feb 2026 266th zakariamouhid 653 234 11ms 3 Jan 2026 267th HumanoidCPU 650 146 16ms 30 Dec 2025 268th evnu 647 323 130ms 25 Jan 2026 269th elgan65536 🇺🇸 647 388 311ms 12 Feb 2026 270th nstearns96 🇬🇧 646 147 16ms 5 Jan 2026 271st ovs-code 🇩🇪 644 245 3ms 24 Feb 2026 272nd JRaspass 🇬🇧 644 254 4ms 1 Jan 2026 273rd jkelly467 640 254 2,903ms 1 Jan 2026 274th snoozingnewt 🇨🇦 637 177 41ms 1 Jan 2026 275th Daniikk1012 636 66 32ms 14 Jan 2026 276th Andriamanitra 🇫🇮 633 178 38ms 1 Jan 2026 277th bac0id 631 250 3ms 30 Jan 2026 278th bac0id 630 316 383ms 30 Jan 2026 279th muser-logiccpu 🇺🇦 629 151 16ms 8 Jan 2026 280th janAkali 🇷🇺 628 273 423ms 1 Jan 2026 281st denkyuu1 626 180 36ms 20 hours ago 282nd IISResetMe 624 161 341ms 25 Dec 2025 283rd acotis 617 407 252ms 1 Jan 2026 284th BambooleanLogic 🇸🇪 616 248 11ms 27 days ago 285th bitsandbeyond 🇳🇱 613 246 6ms 1 Jan 2026 286th gigaprofisi 🇺🇸 606 252 11ms 31 Dec 2025 287th CaedenHarper 🇨🇦 605 329 486ms 26 Dec 2025 288th HumanoidCPU 603 135 410ms 30 Dec 2025 289th tomh1012 599 255 15ms 14 days ago 290th MeWhenI 🇻🇦 587 192 38ms 25 Dec 2025 291st Eulentier161 586 162 17ms 12 Jan 2026 292nd olleicua 🇺🇸 584 193 38ms 2 Jan 2026 293rd h3ra993huskp 🇯🇵 580 343 515ms 29 Dec 2025 294th jerrandolph 576 362 288ms 30 Sep 2025 295th biocommando 🇫🇮 574 266 13ms 7 Jan 2026 296th ravnskjaer 🇩🇰 572 348 497ms 3 Jan 2026 297th MiffOttah 568 275 417ms 3 Jan 2026 297th mwarvik 🇳🇴 568 275 417ms 4 Jan 2026 299th smclaughlin-cf 566 270 11ms 10 Dec 2025 299th olleicua 🇺🇸 566 270 10ms 24 days ago 301st warmCabin 564 280 3ms 1 Jan 2026 302nd retrohun 562 288 19ms 30 Dec 2025 303rd retrohun 552 172 16ms 31 Dec 2025 304th aliakseikalosha 535 292 464ms 17 Jan 2026 305th CatsAreFluffy 527 276 55ms 5 Jan 2026 306th CaedenHarper 🇨🇦 526 297 421ms 28 Dec 2025 307th dokutan 526 378 442ms 3 Feb 2026 308th dokutan 520 294 12ms 3 Feb 2026 309th dokutan 519 391 12ms 3 Feb 2026 310th Andrey2001 511 186 15ms 1 Feb 2026 311th nyson 509 307 432ms 17 Jun 2025 312th dokutan 507 384 567ms 4 Feb 2026 313th Maltaran 🇵🇱 499 316 3ms 24 days ago 314th RaBa21 🇭🇺 495 192 16ms 14 Feb 2026 315th Macweese 495 426 1,422ms 1 Jan 2026 316th qrakhen 492 318 458ms 22 Dec 2025 317th CaedenHarper 🇨🇦 487 266 1,126ms 27 Dec 2025 318th Yewzir 🇧🇪 486 429 314ms 24 days ago 319th Macweese 486 605 44ms 1 Jan 2026 320th codewrite 🇬🇧 481 325 431ms 30 Dec 2025 First Prev 241–320 of 370 Next Last