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?
Day of Week 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 235th ericlangedijk 🇸🇮 934 63 423ms 18 May 2023 235th Lydxn 🇨🇦 934 63 419ms 19 May 2023 235th annaproxy 934 63 400ms 19 May 2023 235th wiz0u 934 63 397ms 20 May 2023 235th revlayle 🇺🇸 934 63 407ms 6 Jun 2023 235th AdrienHache 🇫🇷 934 63 413ms 14 Jun 2023 235th jmerle 🇳🇱 934 63 470ms 15 Jun 2023 235th Theremon72 934 63 408ms 21 Jan 2024 235th namelessiw 934 63 386ms 5 May 2024 235th Steffan153 🇫🇮 934 63 427ms 9 Aug 2024 235th sean-niemann 🇺🇸 934 63 443ms 22 Aug 2024 235th pardouin 🇫🇷 934 63 415ms 21 Sep 2024 235th edsrzf 🇳🇿 934 63 450ms 12 Nov 2024 235th Yax42 🇫🇷 934 63 432ms 30 Nov 2024 235th tomtheisen 🇺🇸 934 63 432ms 10 Feb 2025 235th fuzzylojik-golf 🇺🇸 934 63 422ms 23 May 2025 235th stefangimmillaro 934 63 473ms 18 Jun 2025 235th tomh1012 934 63 404ms 28 Aug 2025 235th CaedenHarper 🇨🇦 934 63 414ms 17 Oct 2025 235th EvilFonti 934 63 436ms 12 Nov 2025 235th amazingalek 🇳🇴 934 63 450ms 29 Dec 2025 235th mwarvik 🇳🇴 934 63 445ms 3 Jan 2026 235th raphaelimahorn 934 63 457ms 14 days ago 264th sisyphus-ppcg 🇦🇺 928 47 5ms 17 Apr 2023 264th Lydxn 🇨🇦 928 47 5ms 17 Apr 2023 264th primo-ppcg 🇹🇭 928 47 5ms 17 Apr 2023 264th stefangimmillaro 928 47 5ms 28 Apr 2023 264th xsot 🇸🇬 928 47 5ms 10 Apr 2024 264th Steffan153 🇫🇮 928 47 5ms 20 Jul 2024 264th sean-niemann 🇺🇸 928 47 5ms 21 Jul 2024 264th fuzzylojik-golf 🇺🇸 928 47 6ms 27 May 2025 264th targrik 928 47 6ms 19 Jun 2025 264th edsrzf 🇳🇿 928 47 5ms 20 Jul 2025 274th ovs-code 🇩🇪 923 38 76ms 16 Apr 2023 274th Steffan153 🇫🇮 923 38 79ms 16 Apr 2023 274th Lydxn 🇨🇦 923 38 78ms 17 Apr 2023 274th sean-niemann 🇺🇸 923 38 83ms 17 Apr 2023 274th Alessandro-Balconi 🇮🇹 923 38 76ms 18 Apr 2023 274th sisyphus-ppcg 🇦🇺 923 38 86ms 21 Apr 2023 274th DialFrost 🇸🇬 923 38 77ms 20 Oct 2023 274th snoozingnewt 🇨🇦 923 38 77ms 21 Oct 2023 274th uttumuttu 🇫🇮 923 38 77ms 22 Dec 2023 274th rboath 923 38 77ms 11 Dec 2024 274th adgh 🇬🇧 923 38 81ms 11 Dec 2024 274th EthanSansom 923 38 77ms 17 Oct 2025 286th rifatx 919 64 420ms 9 Jul 2024 287th edsrzf 🇳🇿 919 80 525ms 24 Sep 2025 287th sean-niemann 🇺🇸 919 80 383ms 24 Sep 2025 287th JayXon 🇺🇸 919 80 490ms 24 Sep 2025 287th nwellnhof 🇩🇪 919 80 490ms 25 Sep 2025 287th namelessiw 919 80 408ms 2 Oct 2025 287th DialFrost 🇸🇬 919 80 493ms 2 Oct 2025 287th Yewzir 🇧🇪 919 80 417ms 2 Oct 2025 287th Yax42 🇫🇷 919 80 525ms 4 Oct 2025 287th stefangimmillaro 919 80 605ms 6 Oct 2025 287th EvilFonti 919 80 400ms 18 Nov 2025 287th h3ra993huskp 🇯🇵 919 80 508ms 30 Nov 2025 287th ScottHamper 919 80 525ms 30 Nov 2025 287th snoozingnewt 🇨🇦 919 80 590ms 14 Dec 2025 287th fuzzylojik-golf 🇺🇸 919 80 506ms 31 Dec 2025 287th Steffan153 🇫🇮 919 80 378ms 11 Feb 2026 302nd ovs-code 🇩🇪 919 81 403ms 16 Jan 2024 302nd Lydxn 🇨🇦 919 81 410ms 16 Jan 2024 302nd Steffan153 🇫🇮 919 81 421ms 16 Jan 2024 302nd kg583 🇺🇸 919 81 444ms 19 Jan 2024 302nd bizy-coder 919 81 421ms 20 Jan 2024 302nd SirBogman 🇺🇸 919 81 391ms 20 Jan 2024 302nd JayXon 🇺🇸 919 81 414ms 21 Jan 2024 302nd m-tkach 🇺🇦 919 81 460ms 21 Jan 2024 302nd AlephSquirrel 919 81 402ms 22 Jan 2024 302nd xsot 🇸🇬 919 81 447ms 25 Jan 2024 302nd GrayJoKing 🇦🇺 919 81 428ms 1 Feb 2024 302nd lynn 919 81 444ms 17 Feb 2024 302nd Shanethegamer 🇺🇸 919 81 470ms 4 Mar 2024 302nd pardouin 🇫🇷 919 81 475ms 21 Jun 2024 302nd MeWhenI 🇻🇦 919 81 471ms 13 Jul 2024 302nd CaedenHarper 🇨🇦 919 81 455ms 23 Aug 2024 302nd b-illy 🇬🇧 919 81 389ms 7 Sep 2024 302nd emgordon154 919 81 414ms 29 Sep 2024 302nd sean-niemann 🇺🇸 919 81 441ms 27 Dec 2024 First Prev 241–320 of 1,511 Next Last