The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Sierpiński Triangle 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 240th mokymok 🇺🇸 470 115 10ms 23 Nov 2021 240th Stockoh 🇫🇷 470 115 12ms 16 Nov 2024 243rd adamnielson42 🇺🇸 466 116 9ms 11 Aug 2023 243rd RedzGoose 🇦🇺 466 116 9ms 14 Oct 2024 245th robin-scragg 462 117 10ms 15 Jul 2025 246th CutSandstone 458 118 17ms 8 Jul 2024 247th Anonymousellama21 454 119 11ms 24 May 2022 247th roguh 🇬🇹 454 119 10ms 22 Feb 2024 249th rowboat1 446 121 9ms 22 Jun 2022 250th xbxbxb007 443 122 9ms 22 Jan 2024 251st TheZappie 435 124 9ms 6 Jul 2022 252nd jiaminglimjm 🇲🇾 432 125 16ms 29 Nov 2019 252nd jhpaques 🇫🇷 432 125 16ms 30 Jul 2022 252nd mbittner20 432 125 9ms 6 Jul 2024 255th AforAmpere 429 126 10ms 7 Jun 2020 255th MiranDaniel 🇨🇿 429 126 10ms 30 Aug 2023 255th yuchuehw 429 126 9ms 30 Jan 2024 258th msrawson 425 127 10ms 30 Aug 2018 258th garrisonhh 425 127 10ms 22 Nov 2020 258th bthalheim 425 127 16ms 4 Aug 2022 261st ComputerKWasTaken 🇺🇸 422 128 10ms 1 Jun 2024 261st CyberTapir 422 128 9ms 6 Sep 2024 261st PickausernamePi 422 128 9ms 17 Dec 2024 261st ffelixm 422 128 9ms 1 Jun 2025 265th Trunksistor 🇫🇷 419 129 9ms 21 Apr 2022 266th lmeuser 415 130 10ms 2 Dec 2017 267th mizuzimu 412 131 10ms 22 Nov 2021 267th LostSyntax21 🇬🇧 412 131 10ms 30 Nov 2025 269th bastienvoirin 🇫🇷 409 132 17ms 24 Apr 2020 269th ehulinsky 🇺🇸 409 132 10ms 6 Nov 2021 271st Andre3582 406 133 10ms 29 Sep 2025 272nd yokasuretsu 403 134 9ms 23 Apr 2018 273rd Nikinator2704 400 135 10ms 31 Oct 2025 274th Andrey2001 397 136 13ms 11 hours ago 275th Awsute 394 137 10ms 20 Aug 2024 276th msbranicky 391 138 10ms 26 Jul 2023 277th Kasci 386 140 74ms 28 Dec 2021 278th twocatsinatrenchcoat 383 141 9ms 25 Nov 2022 278th voidgloom 383 141 16ms 23 Oct 2024 280th LeftPathLane 380 142 9ms 28 Oct 2018 280th fajost 380 142 10ms 26 Sep 2020 280th simon-thornton_pace 380 142 9ms 11 Oct 2023 283rd Re-Adventures 🇮🇳 378 143 10ms 25 Sep 2020 283rd mcjo163 378 143 10ms 1 Oct 2022 285th brimstonetrader 372 145 10ms 10 Mar 2025 286th zoemarschner 362 149 9ms 16 May 2022 286th LukasFolwarczny 🇨🇿 362 149 10ms 15 Sep 2022 288th amishtal 360 150 10ms 5 Dec 2019 288th michelebastione 🇮🇹 360 150 9ms 19 Feb 2020 290th feherd 353 153 10ms 4 Mar 2022 290th MaxElf999 353 153 9ms 15 Dec 2022 292nd rschwa6308 🇺🇸 342 158 9ms 2 Apr 2019 292nd r-i-c-e 342 158 10ms 8 Jul 2023 292nd NerdyMcNerd42 342 158 10ms 20 Jul 2024 295th wazawoo 335 161 9ms 23 Oct 2018 295th wrhm 335 161 16ms 14 Dec 2020 297th evanrittner 331 163 16ms 5 Jun 2021 298th muser-logiccpu 🇺🇦 329 164 16ms 23 Jul 2025 299th eiburns 325 166 10ms 8 May 2023 299th Fanrco 325 166 9ms 31 Aug 2023 301st myleopard 323 167 10ms 15 Oct 2021 302nd Altrul 321 168 9ms 17 Dec 2020 303rd tomh1012 316 171 9ms 5 Nov 2020 304th TobyBoyne 🇬🇧 312 173 9ms 1 Jun 2019 304th j3mak 312 173 10ms 17 Jan 2024 306th P-Quentin 🇫🇷 310 174 33ms 9 Aug 2022 307th alangodfrey 298 181 10ms 30 Jan 2019 307th jfallon1997 298 181 9ms 27 Sep 2024 309th orifu 290 186 10ms 7 Mar 2021 310th hjcafaroUC 286 189 10ms 1 Aug 2020 311th DrPrettyman 283 191 10ms 5 Jul 2023 312th SimonPeatman 265 204 10ms 3 Feb 2019 313th Starwort 🇬🇧 263 205 10ms 22 Mar 2019 314th decorator-factory 257 210 9ms 26 May 2019 315th Omega65536 🇩🇪 241 224 10ms 6 Jan 2021 316th Crankbrother 234 231 10ms 16 Sep 2020 317th dzshn 227 238 9ms 25 Nov 2020 318th Haksell 🇦🇶 205 263 10ms 2 Jun 2019 319th potato-jackson 201 269 10ms 3 Mar 2021 320th greggelong 199 271 10ms 17 Jan 2020 First Prev 241–320 of 406 Next Last
