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?
ASCII Table 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 319th shibacho 🇯🇵 421 164 10ms 9 Nov 2022 319th camieac 🇬🇧 421 164 10ms 25 Jan 2024 319th EthanJantz 421 164 9ms 29 Aug 2025 324th mossprescott 418 165 10ms 10 Jan 2023 324th MisterrLuck 418 165 10ms 3 Sep 2023 326th CyberTapir 416 166 9ms 10 Sep 2024 326th te-chnical 416 166 16ms 14 May 2025 328th bob-th 413 167 16ms 15 Jul 2022 328th CatsAreFluffy 413 167 17ms 20 Feb 2023 328th hotmanga 413 167 10ms 26 Oct 2023 328th Jacob385 413 167 18ms 18 Apr 2024 332nd asterized 411 168 17ms 28 Nov 2023 332nd Stockoh 🇫🇷 411 168 17ms 26 Apr 2024 332nd gautambp 411 168 16ms 23 Jun 2025 332nd Aquateraneal 🇺🇸 411 168 10ms 21 Nov 2025 332nd JOrE20 411 168 9ms 2 Feb 2026 337th SomeKitten 🇺🇸 408 169 10ms 30 Aug 2022 337th n0es 408 169 10ms 6 Oct 2022 337th julian-hoelz 408 169 9ms 22 Sep 2024 340th Ythaenagor 406 170 10ms 5 Aug 2024 340th osNiko 🇧🇷 406 170 17ms 4 Aug 2025 342nd eshilo-draper 404 171 11ms 12 Sep 2022 342nd ffelixm 404 171 16ms 30 May 2025 342nd Sharrrkkk 404 171 10ms 20 Jul 2025 342nd cthierfelder 🇲🇨 404 171 9ms 31 Jul 2025 342nd kasarino 404 171 10ms 31 Jan 2026 347th sacredeux 401 172 10ms 7 Aug 2024 347th pquline 401 172 17ms 4 Mar 2025 349th eiburns 399 173 9ms 4 May 2023 349th mjecke 399 173 16ms 3 Jul 2023 349th Vaekor 399 173 10ms 3 Aug 2023 352nd GeneralTwi 397 174 17ms 8 Apr 2022 352nd ramsay 397 174 11ms 14 Aug 2022 352nd jatloe 397 174 16ms 28 Jan 2024 352nd mar-moraes 397 174 9ms 1 May 2024 352nd abbyonstott 397 174 9ms 2 Oct 2024 357th xbxbxb007 394 175 10ms 10 Jan 2024 358th P-Quentin 🇫🇷 392 176 9ms 9 Aug 2022 358th Fur0rem 392 176 17ms 16 Jul 2025 360th jorisbertram 388 178 10ms 26 Aug 2022 361st PotatoSaladOverlord 385 179 10ms 15 Mar 2023 362nd OCNeve 375 184 10ms 17 Jun 2024 363rd Saaxxx 373 185 10ms 30 Nov 2023 364th ComputerKWasTaken 🇺🇸 369 187 16ms 23 Jan 2025 365th DoubleUynn 365 189 10ms 23 Jun 2025 366th PaulBadour 363 190 10ms 29 Oct 2023 367th pythonNoobOz 359 192 10ms 21 Jun 2023 367th MichaelHorwitz 359 192 10ms 8 Sep 2023 367th resoNathan 359 192 11ms 29 Apr 2024 367th wuduculfre 359 192 9ms 28 Jul 2025 371st DrPrettyman 356 194 11ms 4 Jul 2023 372nd Bananapants22 348 198 10ms 15 Aug 2022 372nd joonaspu 348 198 10ms 3 Jun 2023 372nd yuchuehw 348 198 17ms 28 Jan 2024 375th Mikey-Beep 🇬🇧 347 199 10ms 28 Aug 2023 376th LukasFolwarczny 🇨🇿 345 200 16ms 17 Sep 2022 377th audrey314 340 203 10ms 29 Oct 2023 378th atazzam 🇺🇸 325 212 10ms 1 Apr 2022 378th fenix-bear 325 212 10ms 4 Jul 2023 380th DukeOfSlovakia 309 223 10ms 27 Oct 2023 381st dzshn 305 226 19ms 24 Aug 2022 382nd griffinschreiber 295 234 11ms 25 Jun 2023 383rd eddvrs 282 245 10ms 27 Aug 2022 384th NoneTheFewer 271 255 10ms 27 Dec 2025 385th minsun-ss 257 268 9ms 29 Aug 2025 386th blueCormorant 255 271 9ms 6 Jun 2024 387th RedzGoose 🇦🇺 245 282 16ms 10 Sep 2024 387th HunterC14 245 282 17ms 17 Nov 2025 389th omri2001 244 283 16ms 22 Oct 2022 389th 051 🇸🇬 244 283 10ms 16 Feb 2026 391st firegene 🇮🇪 243 284 17ms 18 Apr 2022 391st Puperger 243 284 17ms 7 May 2022 391st j-Ewan 243 284 16ms 13 May 2022 391st TheSmilingTurtle 243 284 17ms 13 May 2022 391st cafehaine 🇫🇷 243 284 16ms 23 May 2022 391st sleepyStick 243 284 17ms 14 Jul 2022 391st venkatesh1220 243 284 17ms 7 Oct 2022 391st murugan-k-0204 243 284 16ms 7 Oct 2022 391st landyrisbad 243 284 17ms 13 Nov 2022 391st KevinLyvers 243 284 16ms 13 Dec 2022 First Prev 321–400 of 473 Next Last