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?
Abundant 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 476th emgordon154 905 61 2,596ms 27 Oct 2024 476th sean-niemann 🇺🇸 905 61 2,724ms 30 Oct 2024 476th dokutan 905 61 2,625ms 16 Jul 2025 476th aditsu 905 61 2,733ms 9 Sep 2025 476th jkelly467 905 61 2,630ms 4 Nov 2025 476th sean-niemann 🇺🇸 905 61 14ms 18 Nov 2025 476th ovs-code 🇩🇪 905 61 14ms 19 Nov 2025 476th dokutan 905 61 15ms 19 Nov 2025 476th Steffan153 🇫🇮 905 61 15ms 13 Feb 2026 490th sisyphus-ppcg 🇦🇺 904 42 125ms 14 Dec 2022 490th Lydxn 🇨🇦 904 42 111ms 15 Dec 2022 490th DialFrost 🇸🇬 904 42 106ms 2 Jul 2025 490th sean-niemann 🇺🇸 904 42 120ms 3 Jul 2025 494th GrayJoKing 🇦🇺 904 67 43ms 19 Nov 2022 494th MeWhenI 🇻🇦 904 67 22ms 22 Nov 2022 494th Shanethegamer 🇺🇸 904 67 21ms 5 Oct 2023 494th sean-niemann 🇺🇸 904 67 23ms 7 Jan 2024 494th DialFrost 🇸🇬 904 67 39ms 23 Jan 2026 499th JayXon 🇺🇸 904 111 282ms 8 Feb 2024 500th stefangimmillaro 903 66 39ms 19 Nov 2022 500th janbehrens 🇩🇪 903 66 30ms 19 Nov 2022 500th diddily 903 66 30ms 20 Nov 2022 500th SirBogman 🇺🇸 903 66 50ms 20 Nov 2022 500th StefanHabel 🇨🇦 903 66 30ms 20 Nov 2022 500th Alex-x90 🇺🇸 903 66 30ms 20 Nov 2022 500th jakobkordez 🇸🇮 903 66 30ms 20 Nov 2022 500th anter69 🇭🇺 903 66 30ms 21 Nov 2022 500th inverseLorentz 🇦🇺 903 66 30ms 22 Nov 2022 500th QuincyNash 🇺🇸 903 66 30ms 27 Nov 2022 500th OllieBoyne 🇬🇧 903 66 30ms 28 Nov 2022 500th jroscoe5 903 66 31ms 7 Dec 2022 500th Eilonlif 🇮🇱 903 66 30ms 9 Dec 2022 500th 051 🇸🇬 903 66 30ms 15 Dec 2022 500th jfallon1997 903 66 31ms 3 Jan 2023 500th betaveros 903 66 29ms 7 Jan 2023 500th bob-th 903 66 30ms 24 Jan 2023 500th Ripick 903 66 30ms 1 Feb 2023 500th CatsAreFluffy 903 66 28ms 18 Feb 2023 500th Just4FunCoder 903 66 30ms 23 Mar 2023 500th jhu04 903 66 30ms 26 Apr 2023 500th CedricGebistorf 903 66 28ms 3 May 2023 500th fourth-bit 903 66 31ms 26 Jun 2023 500th bartsowka2000 903 66 29ms 4 Jul 2023 500th 2011-Chan-Ethan 903 66 29ms 5 Jul 2023 500th Alessandro-Balconi 🇮🇹 903 66 30ms 23 Aug 2023 500th cesarm4 903 66 29ms 29 Aug 2023 500th BREMAUCY 🇫🇷 903 66 30ms 12 Oct 2023 500th PeterTillema 🇳🇱 903 66 31ms 20 Oct 2023 500th keelimeguy 🇺🇸 903 66 31ms 6 Nov 2023 500th wen1now 903 66 30ms 6 Nov 2023 500th kurkale6ka 903 66 30ms 19 Dec 2023 500th 5cw 🇺🇸 903 66 30ms 25 Dec 2023 500th duckyluuk 🇳🇱 903 66 30ms 24 Jan 2024 500th mar-moraes 903 66 29ms 9 Feb 2024 500th drochom 903 66 30ms 19 Jun 2024 500th ahmetdemirag 🇨🇾 903 66 29ms 30 Jun 2024 500th davecame 903 66 30ms 19 Sep 2024 500th jatloe 903 66 31ms 27 Sep 2024 500th Powerroff 903 66 32ms 17 Nov 2024 500th dwou 903 66 30ms 3 Jan 2025 500th ZakkkkAttackkkk 🇵🇭 903 66 30ms 20 Feb 2025 500th zhaohm14 903 66 30ms 9 Jun 2025 500th vgamula 🇺🇦 903 66 30ms 15 Jul 2025 500th ridingqwerty 🇺🇸 903 66 30ms 18 Jul 2025 500th RaBa21 🇭🇺 903 66 30ms 19 Jul 2025 500th 09cf 903 66 31ms 9 Nov 2025 500th CommandLeo 🇮🇹 903 66 30ms 11 Nov 2025 500th IshanPanpaliya 903 66 30ms 30 Nov 2025 500th JOrE20 903 66 28ms 27 Dec 2025 500th Lv0Sys 🇵🇱 903 66 30ms 25 Feb 2026 551st Lydxn 🇨🇦 903 72 6ms 15 Jul 2023 552nd Shanethegamer 🇺🇸 903 82 119ms 13 Mar 2023 552nd emgordon154 903 82 149ms 18 Feb 2025 552nd DialFrost 🇸🇬 903 82 148ms 5 Apr 2025 552nd fuzzylojik-golf 🇺🇸 903 82 143ms 3 Sep 2025 552nd pardouin 🇫🇷 903 82 125ms 19 Sep 2025 557th KasperKivimaeki 🇫🇮 903 89 378ms 30 Nov 2025 558th MeWhenI 🇻🇦 902 63 42ms 1 Jun 2023 558th stefangimmillaro 902 63 44ms 11 Jun 2023 560th Lydxn 🇨🇦 902 68 1,100ms 21 Mar 2023 First Prev 481–560 of 2,765 Next Last