The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 794th jtaxen 826 99 18ms 22 Mar 2024 794th christensendaniel 826 99 15ms 14 May 2024 794th abhishekg999 826 99 33ms 22 Sep 2024 794th moustave 826 99 15ms 7 Jan 2025 794th sciencejiho 826 99 14ms 10 Feb 2025 794th 0dyse 826 99 19ms 15 Apr 2025 794th Voltrifrodec 🇸🇰 826 99 15ms 27 Apr 2025 794th CoolBvll 826 99 19ms 10 Jul 2025 794th michelebastione 🇮🇹 826 99 15ms 6 Aug 2025 794th jacekwladzinski 826 99 14ms 4 Oct 2025 794th KatieLG 🇬🇧 826 99 17ms 23 Dec 2025 794th Matter1024 🇮🇳 826 99 15ms 24 days ago 813th xsot 🇸🇬 824 54 9ms 28 Sep 2024 814th lyphyser 824 131 51ms 10 Feb 2025 815th primo-ppcg 🇹🇭 824 206 43ms 26 Apr 2025 815th marshallward 🇺🇸 824 206 41ms 7 May 2025 817th KrausRaus 🇺🇸 823 53 6ms 21 Apr 2023 817th Shanethegamer 🇺🇸 823 53 6ms 2 Jul 2023 817th Kokusui 🇯🇵 823 53 6ms 4 Oct 2024 817th Salutations45 823 53 5ms 21 Nov 2024 821st GrayJoKing 🇦🇺 823 138 17ms 3 May 2023 822nd fuzzylojik-golf 🇺🇸 822 105 9ms 14 Oct 2023 822nd jkelly467 822 105 10ms 8 Jan 2026 824th MeWhenI 🇻🇦 820 207 40ms 29 Apr 2025 825th mtirado1 819 102 4ms 17 Apr 2023 825th NickTheEASDude 🇺🇸 819 102 3ms 27 Mar 2024 827th Steffan153 🇫🇮 819 194 32ms 12 Feb 2026 828th JayXon 🇺🇸 819 307 1,694ms 22 Apr 2024 829th m42km 818 91 424ms 4 Feb 2024 830th MeWhenI 🇻🇦 818 175 27ms 20 Dec 2023 831st emgordon154 818 328 1,427ms 6 Nov 2025 832nd sisyphus-ppcg 🇦🇺 817 100 8ms 21 Apr 2023 832nd XioR112 🇵🇱 817 100 22ms 5 Sep 2023 832nd OCNeve 817 100 18ms 18 Jun 2024 832nd StinkyMilo 817 100 14ms 13 May 2025 836th Shanethegamer 🇺🇸 816 89 197ms 24 May 2025 836th sean-niemann 🇺🇸 816 89 211ms 25 May 2025 838th Yewzir 🇧🇪 816 126 443ms 6 May 2024 839th MeWhenI 🇻🇦 816 196 919ms 26 days ago 840th Ripick 814 73 391ms 11 Jul 2024 841st KatieLG 🇬🇧 814 106 9ms 24 Apr 2023 842nd dokutan 814 151 601ms 7 Nov 2025 843rd GrayJoKing 🇦🇺 814 221 19ms 31 Jul 2023 844th sean-niemann 🇺🇸 813 238 5ms 29 May 2025 845th gnlow 🇰🇷 812 83 53ms 11 Feb 2025 845th LarsFredrikHolstTry 812 83 49ms 28 Oct 2025 847th Bubbler-4 812 85 314ms 17 Apr 2023 847th dokutan 812 85 210ms 4 Aug 2024 847th emgordon154 812 85 222ms 8 May 2025 850th 2bular 812 95 3ms 3 Aug 2025 851st AdrienHache 🇫🇷 812 133 52ms 17 Sep 2024 852nd sisyphus-ppcg 🇦🇺 811 103 4ms 5 Oct 2023 852nd dokutan 811 103 4ms 14 Sep 2024 854th uttumuttu 🇫🇮 809 101 14ms 22 Dec 2023 854th jameswmccarty 809 101 13ms 6 Mar 2025 856th emgordon154 808 139 7ms 28 Dec 2024 857th dokutan 807 90 242ms 29 Jun 2024 858th nwellnhof 🇩🇪 807 119 4ms 28 Apr 2023 859th canissimia 🇦🇶 807 458 45ms 8 Jan 2024 860th snoozingnewt 🇨🇦 806 50 3ms 12 Dec 2025 861st plittlewood 806 73 383ms 16 Apr 2025 862nd edsrzf 🇳🇿 806 192 40ms 4 Jan 2026 863rd acotis 806 229 232ms 15 Dec 2025 864th anter69 🇭🇺 805 55 1,384ms 10 Feb 2026 865th canissimia 🇦🇶 805 211 154ms 22 Aug 2023 866th stefangimmillaro 804 155 760ms 19 Aug 2023 867th wasabi-avalanches 803 47 38ms 6 Apr 2024 867th emgordon154 803 47 39ms 17 Nov 2024 867th Lv0Sys 🇵🇱 803 47 38ms 8 Dec 2025 867th Ronterox 803 47 39ms 4 Feb 2026 871st MeWhenI 🇻🇦 803 74 419ms 27 Jul 2024 871st HumanoidCPU 803 74 379ms 27 Sep 2024 873rd Yewzir 🇧🇪 803 84 50ms 5 Nov 2023 873rd XenThe 🇬🇧 803 84 60ms 23 Jun 2025 875th Shanethegamer 🇺🇸 803 104 4ms 16 Apr 2023 876th Yewzir 🇧🇪 803 153 487ms 4 Jul 2023 877th xbxbxb007 802 133 290ms 10 Jan 2024 878th edsrzf 🇳🇿 802 262 80ms 43 hours ago 879th Natanaelel 🇸🇪 801 102 14ms 18 Apr 2023 879th VV1Git 801 102 14ms 19 Apr 2023 First Prev 801–880 of 1,510 Next Last