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?
𝑒 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 225th FortuiteMan 🇫🇷 953 27 39ms 6 Oct 2024 225th emgordon154 953 27 38ms 26 Nov 2024 225th iczelia 🇩🇪 953 27 38ms 21 Sep 2025 225th blaztoma 🇱🇹 953 27 38ms 25 Oct 2025 245th DialFrost 🇸🇬 953 47 369ms 15 Jan 2024 245th SirBogman 🇺🇸 953 47 425ms 15 Jan 2024 245th kg583 🇺🇸 953 47 454ms 15 Jan 2024 245th sean-niemann 🇺🇸 953 47 463ms 15 Jan 2024 245th commandz0 🇺🇸 953 47 380ms 15 Jan 2024 245th ovs-code 🇩🇪 953 47 417ms 15 Jan 2024 245th GolfingSuccess 🇬🇷 953 47 429ms 15 Jan 2024 245th GrayJoKing 🇦🇺 953 47 393ms 16 Jan 2024 245th Lydxn 🇨🇦 953 47 401ms 16 Jan 2024 245th inventshah 953 47 413ms 16 Jan 2024 245th Steffan153 🇫🇮 953 47 381ms 16 Jan 2024 245th rucin93 🇵🇱 953 47 386ms 16 Jan 2024 245th AlephSquirrel 953 47 401ms 16 Jan 2024 245th sisyphus-ppcg 🇦🇺 953 47 391ms 16 Jan 2024 245th MeWhenI 🇻🇦 953 47 422ms 17 Jan 2024 245th orthoplex 🇨🇽 953 47 432ms 18 Jan 2024 245th neel11235813 953 47 452ms 19 Jan 2024 245th JayXon 🇺🇸 953 47 399ms 20 Jan 2024 245th m-tkach 🇺🇦 953 47 414ms 20 Jan 2024 245th xsot 🇸🇬 953 47 347ms 25 Jan 2024 245th lynn 953 47 404ms 17 Feb 2024 245th duckyluuk 🇳🇱 953 47 375ms 27 Mar 2024 245th pardouin 🇫🇷 953 47 378ms 22 Jun 2024 245th emgordon154 953 47 391ms 25 Jul 2024 245th b-illy 🇬🇧 953 47 456ms 12 Sep 2024 245th CaedenHarper 🇨🇦 953 47 415ms 13 Sep 2024 245th lifthrasiir 🇰🇷 953 47 409ms 2 Dec 2024 245th fuzzylojik-golf 🇺🇸 953 47 393ms 30 May 2025 245th edsrzf 🇳🇿 953 47 364ms 23 Sep 2025 245th Babafaba 953 47 405ms 30 Oct 2025 245th snoozingnewt 🇨🇦 953 47 412ms 30 Oct 2025 245th BREMAUCY 🇫🇷 953 47 426ms 6 Dec 2025 245th CornerMercury 🇬🇧 953 47 419ms 30 Dec 2025 245th dokutan 953 47 345ms 14 Feb 2026 279th edsrzf 🇳🇿 950 35 8ms 22 Feb 2026 279th emgordon154 950 35 8ms 23 days ago 279th GrayJoKing 🇦🇺 950 35 7ms 22 days ago 279th Steffan153 🇫🇮 950 35 8ms 6 days ago 283rd error256 950 40 124ms 13 Sep 2024 284th ovs-code 🇩🇪 948 76 724ms 18 Dec 2025 284th sean-niemann 🇺🇸 948 76 351ms 19 Dec 2025 286th ovs-code 🇩🇪 946 41 57ms 12 Jan 2023 286th HPWiz 🇳🇿 946 41 58ms 15 Feb 2023 286th zacjl 946 41 55ms 19 Dec 2024 289th lyphyser 946 45 2,338ms 9 Feb 2024 290th stefangimmillaro 946 51 10ms 16 Sep 2023 290th CaedenHarper 🇨🇦 946 51 13ms 16 Jul 2025 290th Nemikolh 🇫🇷 946 51 13ms 21 Oct 2025 293rd HPWiz 🇳🇿 946 56 122ms 3 Jul 2018 294th nwellnhof 🇩🇪 945 33 149ms 4 Dec 2022 294th Lydxn 🇨🇦 945 33 139ms 3 Feb 2023 296th GrayJoKing 🇦🇺 942 50 15ms 27 Oct 2023 296th btnlq 942 50 13ms 27 Oct 2023 296th IanUtley 942 50 13ms 20 May 2024 296th ovs-code 🇩🇪 942 50 11ms 1 Jul 2024 300th saito-ta 🇯🇵 941 65 1,569ms 30 Sep 2024 300th Steffan153 🇫🇮 941 65 2,212ms 11 days ago 302nd KasperKivimaeki 🇫🇮 941 88 32ms 18 Nov 2024 302nd rhdqor213 941 88 6ms 25 Sep 2025 302nd HPWiz 🇳🇿 941 88 11ms 26 Sep 2025 305th JayXon 🇺🇸 940 50 82ms 5 Apr 2023 305th Lydxn 🇨🇦 940 50 88ms 1 Aug 2023 307th JayXon 🇺🇸 937 59 1,423ms 28 Oct 2023 307th pardouin 🇫🇷 937 59 1,354ms 24 Jun 2025 309th edsrzf 🇳🇿 934 42 2,061ms 22 Feb 2026 310th ovs-code 🇩🇪 934 96 391ms 27 Aug 2024 311th JayXon 🇺🇸 931 52 143ms 10 Aug 2024 311th GrayJoKing 🇦🇺 931 52 151ms 13 Aug 2024 311th lukegustafson 🇺🇸 931 52 134ms 1 Sep 2024 314th zacjl 931 60 11ms 12 Jan 2025 314th edsrzf 🇳🇿 931 60 12ms 22 Mar 2025 314th sean-niemann 🇺🇸 931 60 12ms 21 Aug 2025 314th Steffan153 🇫🇮 931 60 20ms 16 Feb 2026 318th lynn 931 62 1,299ms 30 Nov 2021 318th Lydxn 🇨🇦 931 62 1,433ms 22 Dec 2021 318th primo-ppcg 🇹🇭 931 62 1,254ms 14 Jan 2022 First Prev 241–320 of 3,471 Next Last