The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 251ms 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 10 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 Maashau 410 385 3ms 29 Dec 2025 333rd nate8nate 407 483 6ms 11 May 2025 334th guilhem-roy 🇫🇷 380 250 11ms 23 days ago 335th JOrE20 373 673 300ms 25 Feb 2026 336th JesseNoEyes 🇺🇸 369 257 16ms 15 Jan 2026 337th solisolu 367 259 14ms 17 days ago 338th Macweese 352 512 2,996ms 1 Jan 2026 339th WalrusesAreAwesome 325 486 4ms 18 Feb 2026 340th dokutan 299 555 140ms 8 Feb 2026 341st FlorianCassayre 🇫🇷 298 319 16ms 30 Jan 2026 342nd Msleizak 🇫🇷 298 337 325ms 9 Jan 2026 343rd 4ndyJ 🇬🇧 280 339 17ms 1 Jan 2026 344th CatsAreFluffy 271 350 273ms 2 Jan 2026 345th isenschmid 253 397 324ms 7 days ago 346th dokutan 250 626 462ms 3 Feb 2026 347th CheeseCake628 🇳🇴 249 381 20ms 12 Jan 2026 348th JOrE20 235 1,000 57ms 25 Dec 2025 349th johannes-looney-lizard 216 724 400ms 25 Apr 2025 350th CheeseCake628 🇳🇴 210 387 712ms 2 Jan 2026 351st Macweese 206 705 60ms 1 Jan 2026 352nd dokutan 202 917 125ms 3 Feb 2026 353rd aksyristos 187 603 40ms 27 Dec 2025 354th dokutan 186 698 863ms 3 Feb 2026 355th snoozingnewt 🇨🇦 182 868 4ms 4 Oct 2025 356th dokutan 170 1,057 79ms 3 Feb 2026 357th dokutan 166 879 208ms 10 Feb 2026 358th dokutan 159 1,420 9ms 11 days ago 359th dokutan 149 1,057 3ms 3 Feb 2026 360th fantaize 141 1,783 229ms 15 days ago 361st JOrE20 114 1,599 3ms 25 Feb 2026 362nd JOrE20 112 1,806 140ms 1 Jan 2026 363rd AstroOrbis 105 907 12ms 1 Feb 2026 364th 2bular 0 84 97ms 20 Dec 2025 365th GolfingSuccess 🇬🇷 0 102 67ms 5 Feb 2025 366th dokutan 0 108 62ms 26 days ago 367th ovs-code 🇩🇪 0 148 14ms 2 Nov 2025 368th snoozingnewt 🇨🇦 0 183 65ms 19 days ago 369th masikoijo 0 309 6ms 27 days ago 370th dokutan 0 555 72ms 8 Feb 2026 First Prev 321–370 of 370
