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?
Odious Numbers (Long) 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 0xjac 🇨🇭 861 87 278ms 17 Jun 2025 722nd Maximizer02 859 51 2,519ms 28 Oct 2024 722nd msbranicky 859 51 2,734ms 6 Jan 2025 724th DialFrost 🇸🇬 859 122 1,617ms 17 Jan 2026 725th DialFrost 🇸🇬 859 162 12ms 13 Aug 2025 726th DialFrost 🇸🇬 858 58 1,160ms 6 Aug 2024 727th kg583 🇺🇸 858 96 39ms 11 days ago 727th Steffan153 🇫🇮 858 96 37ms 6 days ago 729th primo-ppcg 🇹🇭 857 31 267ms 9 Sep 2022 730th rucin93 🇵🇱 857 77 59ms 21 Jun 2023 730th luuumine 🇫🇷 857 77 60ms 8 Nov 2025 732nd Natanaelel 🇸🇪 856 42 66ms 26 Sep 2023 732nd dokutan 856 42 64ms 13 Sep 2024 734th DialFrost 🇸🇬 856 51 2ms 15 Apr 2025 735th MeWhenI 🇻🇦 855 66 122ms 7 Sep 2022 735th andersk 🇺🇸 855 66 120ms 25 Oct 2022 735th kgodara 855 66 121ms 6 Mar 2023 735th elgan65536 🇺🇸 855 66 123ms 1 Apr 2024 735th acotis 855 66 120ms 6 Apr 2025 735th fuzzylojik-golf 🇺🇸 855 66 121ms 1 Jul 2025 741st MeWhenI 🇻🇦 854 33 1,203ms 13 Nov 2022 741st Andriamanitra 🇫🇮 854 33 1,263ms 28 Jul 2023 743rd JOrE20 854 71 25ms 26 Nov 2025 743rd dpethes 854 71 25ms 11 Dec 2025 745th retrohun 852 39 6ms 9 Sep 2022 746th ovs-code 🇩🇪 852 43 144ms 4 Aug 2024 746th emplv 🇱🇻 852 43 142ms 29 Oct 2024 748th Steffan153 🇫🇮 852 57 1,348ms 3 Jan 2023 749th Steffan153 🇫🇮 851 30 3ms 6 Mar 2023 750th DialFrost 🇸🇬 851 80 120ms 2 Dec 2025 750th snoozingnewt 🇨🇦 851 80 119ms 13 Dec 2025 752nd emgordon154 851 88 291ms 17 Jan 2025 752nd snoozingnewt 🇨🇦 851 88 287ms 25 Oct 2025 754th Shanethegamer 🇺🇸 849 47 18ms 6 Sep 2022 754th KatieLG 🇬🇧 849 47 10ms 7 Sep 2022 754th Eilonlif 🇮🇱 849 47 16ms 7 Sep 2022 754th 051 🇸🇬 849 47 18ms 8 Sep 2022 754th suwat513 849 47 11ms 13 Sep 2022 754th QuincyNash 🇺🇸 849 47 10ms 6 Dec 2022 754th TaserTheFox 🇺🇸 849 47 17ms 9 Jan 2023 754th SirFireball3521 849 47 10ms 4 Feb 2023 754th quimey 849 47 10ms 22 Mar 2023 754th CedricGebistorf 849 47 11ms 4 May 2023 754th tri1212 🇻🇳 849 47 16ms 9 May 2023 754th rollershutter 849 47 10ms 24 Jun 2023 754th 2011-Chan-Ethan 849 47 11ms 6 Jul 2023 754th msbranicky 849 47 10ms 10 Jul 2023 754th Re-Adventures 🇮🇳 849 47 10ms 20 Jul 2023 754th Andriamanitra 🇫🇮 849 47 17ms 28 Jul 2023 754th 5cw 🇺🇸 849 47 10ms 1 Aug 2023 754th ListeriaM 849 47 11ms 25 Aug 2023 754th minhtrancccp 849 47 10ms 17 Oct 2023 754th m42km 849 47 10ms 21 Oct 2023 754th cros107 🇦🇺 849 47 16ms 26 Oct 2023 754th MichalMarsalek 🇨🇿 849 47 10ms 8 Nov 2023 754th boboquack 849 47 16ms 18 Nov 2023 754th jatloe 849 47 18ms 28 Jan 2024 754th NickTheEASDude 🇺🇸 849 47 17ms 1 Feb 2024 754th retrohun 849 47 10ms 29 Mar 2024 754th elgan65536 🇺🇸 849 47 9ms 1 Apr 2024 754th Bulmenisaurus 849 47 10ms 8 Jul 2024 754th hellwue 849 47 18ms 4 Sep 2024 754th JunkIce 849 47 10ms 17 Sep 2024 754th lifthrasiir 🇰🇷 849 47 10ms 14 Nov 2024 754th itljan30 849 47 10ms 28 Jan 2025 754th vhoulbreque 🇫🇷 849 47 17ms 10 Feb 2025 754th souta-1326 849 47 17ms 25 Mar 2025 754th moustave 849 47 17ms 7 Apr 2025 754th nooby31415 849 47 11ms 18 Apr 2025 754th Inventor51 849 47 16ms 21 May 2025 754th jipsong 🇩🇪 849 47 11ms 24 May 2025 754th dirckvdende 849 47 17ms 23 Jul 2025 754th YAJUE114514 849 47 11ms 30 Jul 2025 754th ApoChagi 849 47 11ms 11 Oct 2025 754th Lv0Sys 🇵🇱 849 47 10ms 7 Dec 2025 754th yujh-yujh 🇬🇸 849 47 17ms 12 Dec 2025 754th 77Tigers 849 47 10ms 13 Jan 2026 754th netfri25 🇮🇱 849 47 17ms 21 Feb 2026 754th rotemkm 849 47 17ms 21 Feb 2026 754th tomh1012 849 47 17ms 23 days ago First Prev 721–800 of 2,586 Next Last