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?
Diamonds 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 399th karhuthebear 371 151 10ms 11 May 2022 399th LocNgu 371 151 9ms 21 Jul 2023 399th pde-bakk 🇳🇱 371 151 9ms 25 Oct 2023 399th lucasging 371 151 10ms 26 May 2025 399th 123mjb 371 151 10ms 5 Jun 2025 406th rishavb123 368 152 12ms 19 Jul 2018 406th DaleNaci 368 152 10ms 19 Jul 2018 406th ngynkvn 368 152 10ms 27 Sep 2021 406th za3k 368 152 10ms 9 Oct 2022 406th tpremoli 368 152 10ms 9 Jul 2025 411th l-donovan 366 153 10ms 31 Jan 2024 411th croc54 366 153 9ms 30 Dec 2024 413th ly0va 364 154 9ms 8 Jan 2019 413th DarkTemplar5 364 154 10ms 10 Oct 2020 413th hellwue 364 154 11ms 1 Mar 2022 413th BerkeAltiparmak 364 154 10ms 22 May 2022 413th sultan 364 154 10ms 6 Jun 2022 413th Anananas42 364 154 10ms 6 Aug 2022 413th JesseNoEyes 🇺🇸 364 154 10ms 24 Nov 2024 420th resoNathan 361 155 11ms 3 May 2024 421st MathieuIko 359 156 9ms 20 Feb 2022 421st ellis-rix 359 156 9ms 20 May 2023 421st cingulataluke 359 156 11ms 26 Aug 2023 424th adesanjo 357 157 10ms 24 Oct 2019 424th 4ndyJ 🇬🇧 357 157 11ms 15 Nov 2024 426th hymanimy 354 158 9ms 28 Jul 2021 426th dillon-duncando 354 158 10ms 5 Oct 2022 426th n0es 354 158 10ms 12 Oct 2022 426th bobbysq 354 158 11ms 30 Jun 2023 426th codingisgreatbutiamnot 354 158 11ms 7 Aug 2024 431st kyleclaassen 352 159 10ms 12 Mar 2022 431st Ripick 352 159 10ms 6 May 2023 431st jmatko 352 159 9ms 28 Oct 2023 434th CutSandstone 348 161 11ms 5 Jul 2024 434th LordSir101 348 161 10ms 16 Aug 2025 436th mjecke 346 162 9ms 3 Jul 2023 437th nulzo 344 163 10ms 17 Oct 2025 438th xbxbxb007 341 164 10ms 10 Jan 2024 438th azure-blondon 341 164 10ms 10 Feb 2024 438th psaban 341 164 10ms 31 Jul 2025 441st sli-Lut 339 165 10ms 27 Oct 2023 441st Jonson26 339 165 9ms 11 Feb 2026 443rd j21marshall 337 166 10ms 7 Aug 2020 443rd kronosgreen 337 166 9ms 17 Jul 2023 445th xkacer 🇨🇿 335 167 10ms 31 Jan 2021 445th tston529 335 167 10ms 25 Feb 2022 445th Fanrco 335 167 9ms 31 Aug 2023 448th oAsAo 333 168 10ms 20 Jan 2020 448th eshilo-draper 333 168 10ms 7 Oct 2022 448th Ythaenagor 333 168 10ms 5 Aug 2024 451st ABC00012345 331 169 10ms 2 May 2024 452nd b4dpxl 329 170 10ms 11 Nov 2021 452nd andrewgopher 329 170 10ms 27 Jun 2022 454th pavi2410 327 171 10ms 26 Aug 2020 454th tomh1012 327 171 10ms 13 days ago 456th hyvyys 324 173 9ms 13 Sep 2020 456th johnnythedoggie 324 173 9ms 29 Apr 2021 456th qwjhvbxi 324 173 9ms 5 Feb 2024 459th jydiw 322 174 9ms 14 Dec 2019 459th benradclyffe 322 174 11ms 15 May 2023 459th kbeat 🇰🇿 322 174 10ms 21 May 2025 459th TheZwierzLF 🇵🇱 322 174 9ms 20 Dec 2025 463rd jazzcurio 320 175 11ms 24 Jul 2024 463rd tejapvk 320 175 10ms 18 Jun 2025 465th hiichbindermax 318 176 9ms 12 Feb 2025 466th DrPrettyman 316 177 10ms 26 Jun 2023 467th DrJoWe 315 178 10ms 30 Apr 2024 468th kypi 313 179 10ms 21 Feb 2020 468th Mikey-Beep 🇬🇧 313 179 9ms 1 Jul 2022 468th muser-logiccpu 🇺🇦 313 179 10ms 16 Aug 2025 471st raywinray 311 180 11ms 28 Sep 2018 471st bastienvoirin 🇫🇷 311 180 10ms 4 Apr 2020 471st goGuru 311 180 9ms 14 Dec 2022 471st LuisGoncalves05 🇵🇹 311 180 10ms 9 Jul 2025 471st CoolBvll 311 180 10ms 10 Jul 2025 476th PotatoSaladOverlord 308 182 10ms 19 Jan 2024 476th GitQuick 308 182 9ms 11 Mar 2024 478th estomagordo 🇳🇱 304 184 10ms 3 Aug 2019 479th 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