The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 797th namelessiw 826 99 14ms 21 Feb 2024 797th SB-945 826 99 14ms 5 Mar 2024 797th jtaxen 826 99 18ms 22 Mar 2024 797th christensendaniel 826 99 15ms 14 May 2024 797th abhishekg999 826 99 33ms 22 Sep 2024 797th moustave 826 99 15ms 7 Jan 2025 797th sciencejiho 826 99 14ms 10 Feb 2025 797th 0dyse 826 99 19ms 15 Apr 2025 797th Voltrifrodec 🇸🇰 826 99 15ms 27 Apr 2025 797th CoolBvll 826 99 19ms 10 Jul 2025 797th michelebastione 🇮🇹 826 99 15ms 6 Aug 2025 797th jacekwladzinski 826 99 14ms 4 Oct 2025 797th KatieLG 🇬🇧 826 99 17ms 23 Dec 2025 797th Matter1024 🇮🇳 826 99 15ms 1 Mar 2026 815th xsot 🇸🇬 824 54 9ms 28 Sep 2024 816th lyphyser 824 131 51ms 10 Feb 2025 817th primo-ppcg 🇹🇭 824 206 43ms 26 Apr 2025 817th marshallward 🇺🇸 824 206 41ms 7 May 2025 819th KrausRaus 🇺🇸 823 53 6ms 21 Apr 2023 819th Shanethegamer 🇺🇸 823 53 6ms 2 Jul 2023 819th Kokusui 🇯🇵 823 53 6ms 4 Oct 2024 819th Salutations45 823 53 5ms 21 Nov 2024 823rd GrayJoKing 🇦🇺 823 138 17ms 3 May 2023 824th fuzzylojik-golf 🇺🇸 822 105 9ms 14 Oct 2023 824th jkelly467 822 105 10ms 8 Jan 2026 826th MeWhenI 🇻🇦 820 207 40ms 29 Apr 2025 827th mtirado1 819 102 4ms 17 Apr 2023 827th NickTheEASDude 🇺🇸 819 102 3ms 27 Mar 2024 829th Steffan153 🇫🇮 819 194 32ms 12 Feb 2026 830th JayXon 🇺🇸 819 307 1,694ms 22 Apr 2024 831st m42km 818 91 424ms 4 Feb 2024 832nd MeWhenI 🇻🇦 818 175 27ms 20 Dec 2023 833rd emgordon154 818 328 1,484ms 6 Nov 2025 834th sisyphus-ppcg 🇦🇺 817 100 8ms 21 Apr 2023 834th XioR112 🇵🇱 817 100 22ms 5 Sep 2023 834th OCNeve 817 100 18ms 18 Jun 2024 834th StinkyMilo 817 100 14ms 13 May 2025 838th Shanethegamer 🇺🇸 816 89 197ms 24 May 2025 838th sean-niemann 🇺🇸 816 89 211ms 25 May 2025 838th MeWhenI 🇻🇦 816 89 177ms 2 days ago 841st Yewzir 🇧🇪 816 126 443ms 6 May 2024 842nd MeWhenI 🇻🇦 816 196 919ms 27 Feb 2026 843rd Ripick 814 73 391ms 11 Jul 2024 844th KatieLG 🇬🇧 814 106 9ms 24 Apr 2023 845th dokutan 814 151 601ms 7 Nov 2025 846th GrayJoKing 🇦🇺 814 221 19ms 31 Jul 2023 847th sean-niemann 🇺🇸 813 238 5ms 29 May 2025 848th gnlow 🇰🇷 812 83 53ms 11 Feb 2025 848th LarsFredrikHolstTry 812 83 49ms 28 Oct 2025 850th Bubbler-4 812 85 314ms 17 Apr 2023 850th dokutan 812 85 210ms 4 Aug 2024 850th emgordon154 812 85 222ms 8 May 2025 853rd 2bular 812 95 3ms 3 Aug 2025 854th AdrienHache 🇫🇷 812 133 52ms 17 Sep 2024 855th sisyphus-ppcg 🇦🇺 811 103 4ms 5 Oct 2023 855th dokutan 811 103 4ms 14 Sep 2024 857th uttumuttu 🇫🇮 809 101 14ms 22 Dec 2023 857th jameswmccarty 809 101 13ms 6 Mar 2025 859th emgordon154 808 139 7ms 28 Dec 2024 860th dokutan 807 90 242ms 29 Jun 2024 861st nwellnhof 🇩🇪 807 119 4ms 28 Apr 2023 862nd canissimia 🇦🇶 807 458 45ms 8 Jan 2024 863rd snoozingnewt 🇨🇦 806 50 3ms 12 Dec 2025 864th plittlewood 806 73 383ms 16 Apr 2025 865th edsrzf 🇳🇿 806 192 40ms 4 Jan 2026 866th acotis 806 229 241ms 15 Dec 2025 867th anter69 🇭🇺 805 55 1,384ms 10 Feb 2026 868th canissimia 🇦🇶 805 211 154ms 22 Aug 2023 869th stefangimmillaro 804 155 835ms 19 Aug 2023 870th wasabi-avalanches 803 47 38ms 6 Apr 2024 870th emgordon154 803 47 39ms 17 Nov 2024 870th Lv0Sys 🇵🇱 803 47 38ms 8 Dec 2025 870th Ronterox 803 47 39ms 4 Feb 2026 874th MeWhenI 🇻🇦 803 74 419ms 27 Jul 2024 874th HumanoidCPU 803 74 379ms 27 Sep 2024 876th Yewzir 🇧🇪 803 84 50ms 5 Nov 2023 876th XenThe 🇬🇧 803 84 60ms 23 Jun 2025 878th Shanethegamer 🇺🇸 803 104 4ms 16 Apr 2023 879th Yewzir 🇧🇪 803 153 487ms 4 Jul 2023 880th xbxbxb007 802 133 290ms 10 Jan 2024 First Prev 801–880 of 1,513 Next Last