The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 321st Macweese 479 524 253ms 1 Jan 2026 322nd Jacob385 476 418 399ms 15 Jan 2026 323rd ndren 465 175 389ms 27 Dec 2025 324th yibotongxue 465 204 16ms 20 Sep 2025 325th LostSyntax21 🇬🇧 452 210 15ms 30 Dec 2025 326th madex 🇩🇪 450 361 2,781ms 13 days ago 327th Macweese 447 445 510ms 2 Jan 2026 328th Andrey2001 438 186 514ms 28 Jan 2026 329th zyc-2024 🇨🇳 428 222 16ms 4 Jan 2026 330th kevinnaviapaiva 418 474 16ms 1 Feb 2026 331st JOrE20 417 241 329ms 27 Dec 2025 332nd NameRandomString 414 397 12ms 2 days ago 333rd Maashau 410 385 3ms 29 Dec 2025 334th nate8nate 407 483 6ms 11 May 2025 335th guilhem-roy 🇫🇷 380 250 11ms 25 days ago 336th JOrE20 373 673 299ms 25 Feb 2026 337th JesseNoEyes 🇺🇸 369 257 16ms 15 Jan 2026 338th solisolu 367 259 14ms 20 days ago 339th Macweese 352 512 2,996ms 1 Jan 2026 340th WalrusesAreAwesome 325 486 4ms 18 Feb 2026 341st dokutan 299 555 140ms 8 Feb 2026 342nd FlorianCassayre 🇫🇷 298 319 16ms 30 Jan 2026 343rd Msleizak 🇫🇷 298 337 325ms 9 Jan 2026 344th 4ndyJ 🇬🇧 280 339 17ms 1 Jan 2026 345th CatsAreFluffy 271 350 273ms 2 Jan 2026 346th isenschmid 253 397 324ms 10 days ago 347th dokutan 250 626 462ms 3 Feb 2026 348th CheeseCake628 🇳🇴 249 381 20ms 12 Jan 2026 349th JOrE20 235 1,000 57ms 25 Dec 2025 350th johannes-looney-lizard 216 724 400ms 25 Apr 2025 351st CheeseCake628 🇳🇴 210 387 712ms 2 Jan 2026 352nd Macweese 206 705 60ms 1 Jan 2026 353rd dokutan 202 917 125ms 3 Feb 2026 354th aksyristos 187 603 40ms 27 Dec 2025 355th dokutan 186 698 863ms 3 Feb 2026 356th snoozingnewt 🇨🇦 182 868 4ms 4 Oct 2025 357th dokutan 170 1,057 79ms 3 Feb 2026 358th dokutan 166 879 208ms 10 Feb 2026 359th dokutan 159 1,420 9ms 14 days ago 360th dokutan 149 1,057 3ms 3 Feb 2026 361st fantaize 141 1,783 236ms 17 days ago 362nd JOrE20 114 1,599 3ms 25 Feb 2026 363rd JOrE20 112 1,806 140ms 1 Jan 2026 364th AstroOrbis 105 907 12ms 1 Feb 2026 365th 2bular 0 84 97ms 20 Dec 2025 366th GolfingSuccess 🇬🇷 0 102 67ms 5 Feb 2025 367th dokutan 0 108 62ms 27 Feb 2026 368th ovs-code 🇩🇪 0 148 14ms 2 Nov 2025 369th snoozingnewt 🇨🇦 0 183 65ms 21 days ago 370th masikoijo 0 309 7ms 26 Feb 2026 371st dokutan 0 555 72ms 8 Feb 2026 First Prev 321–371 of 371
