The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Game of Life in Python 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 81st janbehrens 🇩🇪 497 155 19ms 17 Jun 2023 82nd OllieBoyne 🇬🇧 490 157 10ms 24 Dec 2022 82nd Alex-x90 🇺🇸 490 157 34ms 2 Jun 2024 84th andrewjc2000 487 158 20ms 12 Aug 2025 85th Pyroan 481 160 18ms 5 Jan 2026 86th betaveros 478 161 10ms 30 Dec 2022 86th Chara-0x 478 161 10ms 18 Sep 2025 88th thehylian 475 162 10ms 29 Dec 2022 88th inventshah 475 162 13ms 4 Jan 2023 90th jumelet 🇳🇱 472 163 11ms 2 Jan 2023 91st StefanHabel 🇨🇦 467 165 11ms 23 days ago 92nd CedricGebistorf 464 166 11ms 4 May 2023 92nd ahmetdemirag 🇨🇾 464 166 121ms 6 Feb 2025 94th nstearns96 🇬🇧 461 167 11ms 22 Jan 2023 94th maxgodfrey2004 🇨🇦 461 167 20ms 5 Jan 2025 96th LuisGoncalves05 🇵🇹 458 168 17ms 13 Jul 2025 96th te-chnical 458 168 16ms 17 Jan 2026 98th roguh 🇬🇹 453 170 12ms 15 Jan 2024 99th za3k 443 174 12ms 31 Dec 2022 100th mossprescott 440 175 13ms 15 Jan 2023 101st adamnielson42 🇺🇸 438 176 11ms 25 Apr 2023 102nd neihousaigaai 435 177 11ms 28 May 2025 103rd CatsAreFluffy 433 178 12ms 2 Sep 2024 104th Bmrl7 428 180 10ms 26 Dec 2025 105th madex 🇩🇪 421 183 13ms 2 Jun 2023 106th b10011 🇫🇮 418 184 13ms 16 Jan 2023 106th quimey 418 184 17ms 9 Jun 2023 108th JunkIce 416 185 19ms 13 Feb 2025 109th galloj 🇨🇿 410 188 14ms 24 Feb 2023 110th simon-thornton_pace 407 189 19ms 3 Aug 2023 111th SniperSmiley 🇺🇸 403 191 18ms 28 Dec 2022 112th RaBa21 🇭🇺 401 192 19ms 19 Jul 2025 113th itljan30 399 193 17ms 28 Jan 2025 114th moustave 397 194 11ms 28 Nov 2024 115th Florian-Mt 395 195 18ms 12 Jul 2024 116th guilhem-roy 🇫🇷 393 196 16ms 6 Feb 2023 117th dtaylor0 391 197 20ms 25 Dec 2022 117th msbranicky 391 197 17ms 27 Jul 2023 117th sciencedjinn 391 197 11ms 8 Nov 2024 120th mdnestor 389 198 13ms 23 Dec 2022 120th thomasklunker 389 198 12ms 2 Feb 2023 120th RYNO8 389 198 19ms 11 Apr 2023 123rd Matter1024 🇮🇳 387 199 17ms 18 Jan 2026 124th rsgray 383 201 11ms 22 Jan 2024 125th SirFireball3521 381 202 18ms 3 Mar 2023 126th Schreipfelerer 370 208 18ms 11 Sep 2024 127th DialFrost 🇸🇬 368 209 13ms 3 Aug 2024 128th Stockoh 🇫🇷 367 210 19ms 17 Nov 2024 129th YAJUE114514 363 212 10ms 12 Dec 2025 130th fynnkroeger 362 213 21ms 15 Apr 2023 131st amollberg 🇸🇪 360 214 10ms 14 Jan 2024 131st TheZwierzLF 🇵🇱 360 214 95ms 2 Jun 2025 133rd knutae 🇳🇴 358 215 16ms 14 Nov 2023 134th skaravind 356 216 11ms 19 Jan 2026 135th ValentinCassayre 355 217 20ms 17 Oct 2023 135th piano-miles 355 217 12ms 6 Sep 2024 137th luuumine 🇫🇷 344 224 1,733ms 27 Oct 2025 138th mbittner20 342 225 12ms 27 May 2023 138th smilesformiles3 342 225 20ms 14 Jun 2025 140th tomh1012 341 226 18ms 25 Feb 2026 141st jhpaques 🇫🇷 338 228 18ms 18 Jan 2023 141st Wildst 338 228 11ms 7 Jul 2023 143rd RandGuy 335 230 11ms 26 Jan 2024 144th MaxElf999 333 231 18ms 9 Jan 2023 144th kistlerf 🇨🇭 333 231 19ms 19 May 2025 146th jacekwladzinski 330 233 17ms 4 Oct 2025 147th dranjohn 325 237 19ms 16 Sep 2023 148th lhulinsky 324 238 18ms 21 Oct 2024 149th lomarbrick 322 239 17ms 19 May 2023 150th zwxzwxzwx21 317 243 20ms 30 Jan 2024 151st bogosorter 316 244 10ms 13 Jul 2025 152nd lcubelongren 314 245 10ms 16 Feb 2024 153rd celiendonze 🇨🇭 313 246 12ms 27 Jun 2023 153rd jtaxen 313 246 17ms 26 Apr 2024 155th myleopard 309 249 11ms 22 Dec 2022 156th jfallon1997 293 263 18ms 29 Apr 2024 157th robertovers 286 269 17ms 21 Dec 2023 158th rustykitty 🇺🇸 282 273 19ms 3 Nov 2025 159th CoolBvll 280 275 18ms 12 Jun 2025 160th TaserTheFox 🇺🇸 274 281 13ms 5 May 2023 First Prev 81–160 of 205 Next Last