The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 81st nwellnhof 🇩🇪 899 170 18ms 9 Jan 2026 82nd AdrienHache 🇫🇷 893 175 431ms 4 Jan 2026 83rd bitsandbeyond 🇳🇱 889 113 329ms 2 Jan 2026 83rd nwellnhof 🇩🇪 889 113 521ms 4 Jan 2026 85th albanian-laundromat 887 107 17ms 1 Dec 2025 85th antimon2 🇯🇵 887 107 17ms 11 Jan 2026 85th TaserTheFox 🇺🇸 887 107 15ms 22 Jan 2026 88th nwellnhof 🇩🇪 882 179 3ms 6 Jan 2026 89th Matter1024 🇮🇳 879 108 16ms 16 Nov 2025 89th bob-th 879 108 16ms 1 Jan 2026 89th tomh1012 879 108 15ms 26 days ago 92nd ovs-code 🇩🇪 877 109 6ms 27 days ago 93rd nwellnhof 🇩🇪 877 227 387ms 6 Jan 2026 94th voytxt 🇨🇿 873 175 24ms 31 Dec 2025 95th stefangimmillaro 872 129 39ms 29 Dec 2025 96th Shanethegamer 🇺🇸 871 109 17ms 29 Dec 2024 96th msbranicky 871 109 16ms 20 Dec 2025 98th D-MOVE 🇵🇭 865 130 39ms 29 Dec 2025 99th hiichbindermax 863 110 16ms 5 Jan 2026 99th jatloe 863 110 16ms 9 Jan 2026 101st lukegustafson 🇺🇸 863 177 21ms 3 Jan 2026 102nd scpchicken 🇵🇼 855 111 33ms 16 Jan 2026 102nd ZakkkkAttackkkk 🇵🇭 855 111 16ms 1 Feb 2026 104th nwellnhof 🇩🇪 855 116 202ms 2 Jan 2026 105th edsrzf 🇳🇿 854 155 1,509ms 30 Jan 2026 106th nwellnhof 🇩🇪 853 211 455ms 9 Jan 2026 107th edsrzf 🇳🇿 851 191 2,991ms 6 Jan 2026 108th edsrzf 🇳🇿 850 234 448ms 7 Jan 2026 109th rucin93 🇵🇱 849 180 16ms 24 Dec 2025 110th nwellnhof 🇩🇪 848 246 298ms 2 Jan 2026 110th edsrzf 🇳🇿 848 246 295ms 2 Jan 2026 112th edsrzf 🇳🇿 847 153 837ms 15 Feb 2026 113th canissimia 🇦🇶 846 131 7ms 15 Feb 2026 114th kg583 🇺🇸 842 201 43ms 6 May 2025 115th kumavale 842 298 234ms 1 Jan 2026 116th lyphyser 840 173 57ms 10 Feb 2025 117th Steffan153 🇫🇮 839 134 39ms 20 Feb 2026 118th edsrzf 🇳🇿 838 180 14ms 3 Jan 2026 119th Matter1024 🇮🇳 836 233 474ms 23 days ago 120th saito-ta 🇯🇵 834 196 3ms 19 Jan 2026 121st rucin93 🇵🇱 833 199 169ms 17 Feb 2026 122nd edsrzf 🇳🇿 832 206 448ms 3 Jan 2026 123rd GolfingSuccess 🇬🇷 830 98 428ms 29 Dec 2024 123rd kg583 🇺🇸 830 98 415ms 19 Dec 2025 123rd pardouin 🇫🇷 830 98 434ms 20 Dec 2025 123rd CaedenHarper 🇨🇦 830 98 445ms 23 Dec 2025 123rd emgordon154 830 98 435ms 24 Dec 2025 123rd CornerMercury 🇬🇧 830 98 379ms 1 Jan 2026 123rd sean-niemann 🇺🇸 830 98 451ms 1 Jan 2026 123rd fuzzylojik-golf 🇺🇸 830 98 453ms 3 Jan 2026 123rd DialFrost 🇸🇬 830 98 428ms 7 Jan 2026 123rd MeWhenI 🇻🇦 830 98 417ms 10 days ago 133rd ovs-code 🇩🇪 830 169 182ms 2 Jan 2026 134th antimon2 🇯🇵 828 176 320ms 8 Jan 2026 135th edsrzf 🇳🇿 826 238 3ms 6 Jan 2026 136th bstrat 824 116 8ms 17 days ago 137th AlephSquirrel 824 141 46ms 24 Jan 2026 138th targrik 824 183 8ms 6 days ago 139th edsrzf 🇳🇿 823 256 1,399ms 17 Jan 2026 140th commandz0 🇺🇸 822 99 388ms 1 Sep 2025 140th AlephSquirrel 822 99 440ms 18 Dec 2025 140th ryyyn 🇺🇸 822 99 433ms 19 Dec 2025 140th snoozingnewt 🇨🇦 822 99 424ms 22 Dec 2025 140th dokutan 822 99 419ms 15 Feb 2026 140th FortuiteMan 🇫🇷 822 99 431ms 16 days ago 146th stefangimmillaro 822 161 1,608ms 7 Jan 2026 147th saito-ta 🇯🇵 822 197 26ms 16 Jan 2026 148th ovs-code 🇩🇪 820 280 153ms 19 Dec 2025 149th sean-niemann 🇺🇸 819 243 478ms 8 Jan 2026 150th Lv0Sys 🇵🇱 818 238 465ms 23 days ago 151st CaedenHarper 🇨🇦 818 255 303ms 24 Dec 2025 152nd Steffan153 🇫🇮 816 159 6ms 20 Feb 2026 153rd rucin93 🇵🇱 816 223 3ms 27 Dec 2025 154th stefangimmillaro 816 322 149ms 8 Jan 2026 155th edsrzf 🇳🇿 815 227 136ms 3 Jan 2026 156th kg583 🇺🇸 815 231 43ms 3 Sep 2025 157th edsrzf 🇳🇿 813 239 5ms 2 Jan 2026 158th klixel 🇨🇦 812 117 16ms 1 Jan 2026 158th SectorCorruptor 812 117 17ms 11 days ago 160th pardouin 🇫🇷 812 163 1,644ms 21 Dec 2025 First Prev 81–160 of 367 Next Last