The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Arabic to Roman in all languages in bytes. 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 Bytes Time Submitted 721st edsrzf 🇳🇿 678 180 474ms 22 Jul 2025 722nd southpolenator 678 199 75ms 10 Jun 2023 723rd southpolenator 677 151 10ms 10 Jun 2023 724th janbehrens 🇩🇪 677 176 470ms 17 Apr 2025 725th akshatj27 🇦🇶 676 121 125ms 11 Jan 2022 726th itsh01 675 136 18ms 9 Aug 2021 726th Sam-Vrgl 675 136 17ms 13 May 2025 728th Ripick 675 184 445ms 12 Jul 2025 729th lynn 675 204 1,404ms 24 Oct 2021 730th yzhs 🇩🇪 674 179 29ms 8 Feb 2020 730th urojony 🇵🇱 674 179 24ms 27 May 2021 730th raspofabs 674 179 24ms 8 Jul 2023 730th FranklinJiaChen 674 179 22ms 12 Jun 2024 730th kistlerf 🇨🇭 674 179 37ms 12 May 2025 730th LuisGoncalves05 🇵🇹 674 179 23ms 11 Jul 2025 730th jacekwladzinski 674 179 35ms 8 Oct 2025 737th janbehrens 🇩🇪 674 215 612ms 7 Jan 2022 738th MeWhenI 🇻🇦 673 141 10ms 11 Nov 2022 739th prestosilver 🇺🇸 672 185 413ms 30 Dec 2025 740th JDiLenarda 🇫🇷 672 205 1,328ms 22 Nov 2023 741st Indivicivet 671 180 20ms 11 Mar 2021 741st cesarm4 671 180 26ms 31 Aug 2021 741st idoweinstein 671 180 20ms 5 Aug 2022 741st ellis-rix 671 180 24ms 25 Aug 2022 741st StardustGogeta 671 180 24ms 18 Aug 2023 741st Andrey2001 671 180 27ms 23 Nov 2025 747th stefangimmillaro 670 137 17ms 12 Sep 2024 748th Yax42 🇫🇷 669 178 422ms 20 Jun 2025 749th targrik 669 233 332ms 3 Jul 2025 750th Alex-x90 🇺🇸 668 153 10ms 15 May 2023 751st kmathis22 668 217 633ms 19 Dec 2025 752nd CaedenHarper 🇨🇦 667 156 495ms 29 Oct 2025 753rd Fishron 667 181 25ms 20 Nov 2022 753rd nstearns96 🇬🇧 667 181 28ms 29 Nov 2022 753rd pde-bakk 🇳🇱 667 181 26ms 23 Oct 2023 753rd elgan65536 🇺🇸 667 181 22ms 1 Apr 2024 753rd EnTerr 667 181 24ms 8 Sep 2024 753rd Josemnz 667 181 23ms 4 May 2025 759th stackotter 666 227 117ms 29 May 2023 760th Andriamanitra 🇫🇮 665 123 45ms 1 Sep 2022 761st KatieLG 🇬🇧 665 138 16ms 16 Nov 2023 762nd Shanethegamer 🇺🇸 665 221 31ms 10 Feb 2026 763rd alemelis 664 136 814ms 19 Sep 2024 764th Jonatan6 🇩🇰 664 203 89ms 3 Aug 2023 765th Alex-x90 🇺🇸 663 182 47ms 13 Feb 2023 765th cefqrn 663 182 29ms 20 May 2023 765th jeff-at-tamer-dot-codes 🇺🇸 663 182 20ms 8 Sep 2023 765th fgrosshans 🇫🇷 663 182 22ms 16 Jul 2024 769th SirBogman 🇺🇸 663 375 614ms 23 Nov 2022 770th MeWhenI 🇻🇦 661 249 175ms 13 Nov 2022 771st Frowny 660 67 9ms 10 Jan 2022 772nd skps2010 660 183 21ms 31 Dec 2018 772nd asheeri 660 183 22ms 14 Aug 2021 772nd TaserTheFox 🇺🇸 660 183 24ms 8 May 2023 775th olleicua 🇺🇸 659 124 52ms 19 Jan 2024 776th darkoboshkovski 659 155 9ms 12 Jun 2023 777th Mabeloid 🇳🇴 658 158 631ms 17 Sep 2024 777th dokutan 658 158 522ms 1 Feb 2026 779th p-vf 🇨🇭 658 181 406ms 21 Nov 2021 779th Shanethegamer 🇺🇸 658 181 470ms 4 Apr 2023 781st dokutan 658 205 4,456ms 2 Feb 2026 782nd MichalMarsalek 🇨🇿 657 189 463ms 22 Jan 2023 782nd Shanethegamer 🇺🇸 657 189 660ms 21 Mar 2023 782nd DestyNova 🇮🇪 657 189 456ms 15 Apr 2025 785th Shanethegamer 🇺🇸 657 218 115ms 11 Sep 2022 786th annaproxy 657 222 339ms 1 Aug 2022 787th Shanethegamer 🇺🇸 657 237 373ms 4 Apr 2023 788th adoxography 656 184 21ms 10 Oct 2019 788th mokymok 🇺🇸 656 184 29ms 8 Dec 2021 788th jakobkordez 🇸🇮 656 184 19ms 17 Oct 2022 788th yishayv 656 184 21ms 23 Jan 2023 788th Bmrl7 656 184 27ms 17 Feb 2024 788th jatloe 656 184 20ms 5 Oct 2024 794th jared-hughes 655 97 40ms 16 Apr 2022 795th emgordon154 655 140 26ms 2 Dec 2021 795th Lv0Sys 🇵🇱 655 140 14ms 27 Nov 2025 797th prestosilver 🇺🇸 655 156 11ms 21 Nov 2025 798th stefangimmillaro 655 182 452ms 17 Sep 2024 799th Maltaran 🇵🇱 653 122 54ms 2 days ago 800th Shanethegamer 🇺🇸 653 163 175ms 24 May 2025 First Prev 721–800 of 1,912 Next Last