The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 161st bstrat 720 319 8ms 13 days ago 162nd AlephSquirrel 719 101 15ms 28 Dec 2024 162nd enigma 719 101 16ms 19 Dec 2025 162nd qpwoeirut 719 101 16ms 21 Dec 2025 162nd Mukundan314 719 101 16ms 21 Dec 2025 162nd HPWiz 🇳🇿 719 101 16ms 21 Dec 2025 162nd KasperKivimaeki 🇫🇮 719 101 15ms 22 Dec 2025 162nd ahmetdemirag 🇨🇾 719 101 15ms 24 Dec 2025 162nd CommandLeo 🇮🇹 719 101 17ms 26 Dec 2025 162nd Pyroan 719 101 15ms 27 Dec 2025 162nd cros107 🇦🇺 719 101 16ms 28 Dec 2025 162nd davecame 719 101 16ms 2 Jan 2026 162nd zhaohm14 719 101 16ms 9 Jan 2026 162nd madex 🇩🇪 719 101 16ms 16 days ago 175th CaedenHarper 🇨🇦 714 98 445ms 23 Dec 2025 175th MeWhenI 🇻🇦 714 98 417ms 17 days ago 177th CLOStrophobic 🇮🇹 712 102 16ms 19 Jan 2025 178th emgordon154 712 186 1,427ms 15 Feb 2026 179th prestosilver 🇺🇸 711 241 399ms 27 days ago 180th commandz0 🇺🇸 707 99 388ms 1 Sep 2025 180th AlephSquirrel 707 99 440ms 18 Dec 2025 180th ryyyn 🇺🇸 707 99 433ms 19 Dec 2025 180th FortuiteMan 🇫🇷 707 99 431ms 24 days ago 184th stefangimmillaro 706 282 533ms 9 Jan 2026 185th bricknellj 705 103 16ms 20 Nov 2025 185th BREMAUCY 🇫🇷 705 103 15ms 18 Dec 2025 185th andrewjc2000 705 103 16ms 5 Jan 2026 185th StefanHabel 🇨🇦 705 103 15ms 1 Feb 2026 189th aadenboy 🇺🇸 700 281 4ms 12 Feb 2026 190th mwarvik 🇳🇴 697 377 729ms 1 Jan 2026 191st namelessiw 695 225 440ms 28 Oct 2025 192nd KasperKivimaeki 🇫🇮 695 227 3ms 25 Dec 2025 193rd inventshah 692 105 16ms 31 Dec 2025 193rd Artemis21 🇬🇧 692 105 16ms 22 Jan 2026 193rd aksyristos 692 105 16ms 13 Feb 2026 196th stefangimmillaro 692 226 450ms 8 Jan 2026 197th sean-niemann 🇺🇸 692 260 444ms 8 Jan 2026 198th pardouin 🇫🇷 689 236 2,851ms 15 Feb 2026 199th nwellnhof 🇩🇪 687 170 11ms 9 Jan 2026 200th madex 🇩🇪 686 230 3ms 22 Dec 2025 201st bitsandbeyond 🇳🇱 684 239 4ms 1 Jan 2026 202nd nwellnhof 🇩🇪 683 125 37ms 1 Jan 2026 203rd tomh1012 683 229 525ms 22 Dec 2025 204th sean-niemann 🇺🇸 680 163 3ms 8 Jan 2026 205th Chinay-Domitrix 🇺🇸 680 239 2,610ms 16 days ago 206th antimon2 🇯🇵 679 107 17ms 11 Jan 2026 206th TaserTheFox 🇺🇸 679 107 15ms 22 Jan 2026 208th anter69 🇭🇺 677 245 180ms 17 Feb 2026 209th kmathis22 677 294 407ms 19 Dec 2025 210th Matter1024 🇮🇳 673 108 16ms 16 Nov 2025 210th bob-th 673 108 16ms 1 Jan 2026 210th tomh1012 673 108 15ms 26 Feb 2026 213th edsrzf 🇳🇿 672 342 10ms 17 days ago 214th Shanethegamer 🇺🇸 667 109 17ms 29 Dec 2024 214th msbranicky 667 109 16ms 20 Dec 2025 216th stackofbears 666 345 272ms 31 Dec 2025 217th stefangimmillaro 662 129 39ms 29 Dec 2025 218th hiichbindermax 661 110 16ms 5 Jan 2026 219th Shanethegamer 🇺🇸 660 106 432ms 5 Mar 2025 220th lukegustafson 🇺🇸 660 177 11ms 3 Jan 2026 221st bac0id 660 237 441ms 30 Jan 2026 222nd rucin93 🇵🇱 659 302 473ms 2 Jan 2026 223rd D-MOVE 🇵🇭 657 130 39ms 29 Dec 2025 224th bac0id 657 274 466ms 30 Jan 2026 225th scpchicken 🇵🇼 655 111 33ms 16 Jan 2026 225th ZakkkkAttackkkk 🇵🇭 655 111 16ms 1 Feb 2026 227th evnu 647 323 130ms 25 Jan 2026 228th elgan65536 🇺🇸 647 388 281ms 12 Feb 2026 229th ovs-code 🇩🇪 644 245 3ms 24 Feb 2026 230th JRaspass 🇬🇧 644 254 3ms 1 Jan 2026 231st jkelly467 640 254 2,698ms 1 Jan 2026 232nd Daniikk1012 636 66 32ms 14 Jan 2026 233rd bac0id 631 250 3ms 30 Jan 2026 234th bac0id 630 316 383ms 30 Jan 2026 235th janAkali 🇷🇺 628 273 423ms 1 Jan 2026 236th klixel 🇨🇦 621 117 16ms 1 Jan 2026 236th SectorCorruptor 621 117 17ms 18 days ago 238th attila8192 618 189 12ms 4 Mar 2025 239th acotis 617 407 272ms 1 Jan 2026 240th dokutan 614 190 10ms 8 Feb 2026 First Prev 161–240 of 368 Next Last