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?
Evil Numbers in Rust 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 1st JayXon 🇺🇸 1,000 56 123ms 17 Feb 2021 1st Lydxn 🇨🇦 1,000 56 123ms 9 Mar 2022 1st Steffan153 🇫🇮 1,000 56 120ms 2 Aug 2024 1st rucin93 🇵🇱 1,000 56 137ms 3 Aug 2024 1st sean-niemann 🇺🇸 1,000 56 120ms 6 Aug 2024 1st acotis 1,000 56 131ms 10 Jun 2025 1st kumavale 1,000 56 137ms 18 Aug 2025 8th primo-ppcg 🇹🇭 982 57 131ms 9 Jan 2020 8th sisyphus-ppcg 🇦🇺 982 57 122ms 10 Jun 2021 8th lynn 982 57 122ms 17 Nov 2021 8th Bubbler-4 982 57 122ms 6 Sep 2022 8th xnor-gate 982 57 121ms 21 Oct 2022 8th kgodara 982 57 121ms 6 Mar 2023 8th MeWhenI 🇻🇦 982 57 121ms 5 Aug 2023 8th stefangimmillaro 982 57 119ms 2 Oct 2023 8th fuzzylojik-golf 🇺🇸 982 57 125ms 15 Jul 2025 8th Natanaelel 🇸🇪 982 57 131ms 24 Jul 2025 18th andersk 🇺🇸 966 58 127ms 6 Jan 2020 18th edsrzf 🇳🇿 966 58 139ms 24 Feb 2026 20th Shanethegamer 🇺🇸 949 59 127ms 22 Mar 2023 20th elgan65536 🇺🇸 949 59 132ms 4 Apr 2024 22nd wuzekai518 933 60 129ms 18 Jun 2024 23rd pro465 918 61 127ms 11 Feb 2026 24th DialFrost 🇸🇬 889 63 121ms 7 Apr 2025 25th cure-honey 🇯🇵 875 64 153ms 15 Jun 2021 25th dokutan 875 64 120ms 27 Mar 2024 25th pardouin 🇫🇷 875 64 122ms 17 Apr 2025 25th ovs-code 🇩🇪 875 64 143ms 20 Apr 2025 29th emgordon154 862 65 127ms 18 Feb 2025 30th btjones0 848 66 130ms 28 Dec 2020 30th prplz 🇦🇺 848 66 119ms 13 Jan 2022 30th GrayJoKing 🇦🇺 848 66 127ms 13 Jan 2022 30th nipzu 848 66 127ms 13 Jan 2022 30th verticallity 848 66 121ms 6 Apr 2022 30th ian-h-chamberlain 🇺🇸 848 66 114ms 28 Jul 2022 30th 0x00A 848 66 127ms 14 Oct 2022 30th klixel 🇨🇦 848 66 121ms 5 Dec 2022 30th Re-Adventures 🇮🇳 848 66 118ms 9 Jun 2023 30th Aurel300 🇨🇭 848 66 118ms 7 Jun 2024 30th nullie 848 66 124ms 31 Dec 2024 30th snoozingnewt 🇨🇦 848 66 123ms 29 Sep 2025 30th fantaize 848 66 123ms 16 days ago 43rd timvermeulen 836 67 127ms 3 Jan 2020 43rd detrumi 🇳🇱 836 67 126ms 4 Jan 2020 43rd frozolotl 836 67 124ms 8 Jan 2020 43rd nycex 836 67 125ms 8 Jan 2020 43rd WhoisDavid 836 67 126ms 12 Sep 2020 43rd argusdusty 🇺🇸 836 67 130ms 27 Dec 2020 43rd JGDoerrer 836 67 124ms 15 Feb 2022 43rd xDavidL 836 67 132ms 17 Feb 2022 43rd connorslade 836 67 122ms 12 May 2022 43rd erics118 836 67 117ms 13 May 2022 43rd The3gs 836 67 124ms 10 Oct 2022 43rd lzahray 836 67 129ms 21 Oct 2022 43rd Setvizan 836 67 131ms 17 Jan 2023 43rd sona-tau 836 67 128ms 10 Mar 2023 43rd msbranicky 836 67 119ms 3 Oct 2023 43rd Yewzir 🇧🇪 836 67 120ms 17 Nov 2023 43rd TylerBloom 836 67 127ms 22 Mar 2024 43rd CarsonChr 🇺🇸 836 67 125ms 7 Apr 2024 43rd Flying-Toast 836 67 117ms 24 May 2024 43rd funnyboy-roks 836 67 128ms 13 Jun 2024 43rd CosmicRaichu 836 67 124ms 31 Mar 2025 43rd TannerJ07 🇺🇸 836 67 121ms 4 Apr 2025 65th Algorhythm-sxv 824 68 126ms 3 Jan 2020 65th kchapelier 824 68 119ms 17 May 2020 65th Juici 824 68 136ms 17 Sep 2020 65th Pena86 824 68 121ms 27 May 2021 65th Starwort 🇬🇧 824 68 117ms 11 Nov 2022 65th Betuaredead 824 68 129ms 5 Jan 2023 65th NotComplicated 824 68 127ms 4 Oct 2023 65th sreyfe 824 68 116ms 10 Jun 2024 65th Florian-Mt 824 68 122ms 12 Jul 2024 74th Skepfyr 812 69 120ms 3 Jan 2020 74th RustemB 🇷🇺 812 69 120ms 26 Feb 2020 74th Z-snails 812 69 123ms 27 Feb 2023 74th luuumine 🇫🇷 812 69 124ms 11 Nov 2025 78th SolidTux 800 70 129ms 6 Jan 2020 78th fisherdarling 800 70 136ms 7 Feb 2020 78th goodingc 800 70 119ms 3 Oct 2021 1–80 of 115 Next Last