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?
Zeckendorf Representation 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 239th inventshah 854 101 2ms 2 Jul 2024 239th Steffan153 🇫🇮 854 101 2ms 3 Jul 2024 243rd stefangimmillaro 854 147 43ms 13 Jul 2025 244th sean-niemann 🇺🇸 854 159 294ms 1 Jul 2024 245th sean-niemann 🇺🇸 853 123 463ms 4 Jul 2024 246th Shanethegamer 🇺🇸 853 132 170ms 13 Sep 2024 246th snoozingnewt 🇨🇦 853 132 108ms 19 days ago 248th Natanaelel 🇸🇪 852 77 35ms 1 Jul 2024 248th sean-niemann 🇺🇸 852 77 35ms 15 Oct 2025 250th edsrzf 🇳🇿 850 120 455ms 16 days ago 251st namelessiw 850 132 477ms 10 Oct 2025 252nd retrohun 849 60 2ms 16 days ago 253rd starfihs 849 126 31ms 2 Jul 2024 253rd zbreit 🇺🇸 849 126 11ms 9 Jul 2024 253rd StardustGogeta 849 126 11ms 9 Jul 2024 253rd andrewjc2000 849 126 13ms 25 Jul 2025 253rd annaproxy 849 126 11ms 31 Aug 2025 258th GolfingSuccess 🇬🇷 849 129 447ms 1 Jul 2024 259th albanian-laundromat 849 158 3ms 25 Feb 2026 260th edsrzf 🇳🇿 849 160 324ms 17 Dec 2024 261st sean-niemann 🇺🇸 847 102 111ms 6 Dec 2025 262nd GolfingSuccess 🇬🇷 847 103 22ms 8 Jan 2025 263rd GolfingSuccess 🇬🇷 847 105 445ms 1 Jul 2024 263rd DialFrost 🇸🇬 847 105 378ms 3 Jul 2024 263rd m-tkach 🇺🇦 847 105 407ms 5 Jul 2024 263rd sean-niemann 🇺🇸 847 105 539ms 4 Feb 2025 263rd Steffan153 🇫🇮 847 105 408ms 26 Feb 2026 268th DialFrost 🇸🇬 847 121 2,585ms 26 Oct 2024 268th pardouin 🇫🇷 847 121 2,527ms 26 Oct 2024 270th error256 846 129 7ms 2 Jul 2024 270th GrayJoKing 🇦🇺 846 129 9ms 11 days ago 272nd GrayJoKing 🇦🇺 846 138 13ms 24 Jul 2024 273rd emplv 🇱🇻 846 160 25ms 5 Jul 2024 274th sean-niemann 🇺🇸 845 102 2ms 5 Jul 2024 275th stefangimmillaro 845 137 109ms 6 Jan 2025 276th GolfingSuccess 🇬🇷 844 100 14ms 16 Aug 2024 277th mousetail 🇳🇱 843 64 7ms 9 May 2025 278th Shanethegamer 🇺🇸 843 117 2ms 12 Sep 2024 279th DialFrost 🇸🇬 843 121 407ms 10 Apr 2025 280th stefangimmillaro 843 127 12ms 22 Aug 2024 281st Shanethegamer 🇺🇸 843 133 402ms 24 Sep 2025 282nd Shanethegamer 🇺🇸 843 135 127ms 12 Sep 2024 283rd primo-ppcg 🇹🇭 843 149 44ms 2 May 2025 284th Shanethegamer 🇺🇸 843 242 1,432ms 8 Apr 2025 285th DialFrost 🇸🇬 841 158 157ms 6 Apr 2025 286th Shanethegamer 🇺🇸 840 92 145ms 8 Jan 2025 287th typeswitch-dev 🇵🇹 840 130 4ms 7 Jul 2024 288th Shanethegamer 🇺🇸 840 135 30ms 10 Feb 2026 289th error256 840 139 11ms 17 Sep 2024 290th nwellnhof 🇩🇪 839 81 278ms 3 Jul 2024 291st Ripick 839 137 380ms 1 Aug 2024 292nd error256 838 95 1,231ms 1 Jul 2024 292nd stefangimmillaro 838 95 1,286ms 22 Oct 2024 292nd pardouin 🇫🇷 838 95 1,193ms 13 Aug 2025 295th CLOStrophobic 🇮🇹 837 121 25ms 27 Feb 2025 296th xsot 🇸🇬 835 61 2ms 26 Apr 2025 297th GrayJoKing 🇦🇺 835 124 38ms 6 Jul 2024 297th sean-niemann 🇺🇸 835 124 39ms 16 Jul 2024 297th albanian-laundromat 835 124 43ms 16 Feb 2026 300th m-tkach 🇺🇦 834 136 31ms 27 Sep 2024 301st primo-ppcg 🇹🇭 833 76 3ms 22 Jan 2025 302nd CaedenHarper 🇨🇦 833 163 306ms 17 Nov 2025 303rd albanian-laundromat 831 105 23ms 25 Feb 2026 304th AlephSquirrel 831 107 473ms 2 Jul 2024 304th bizy-coder 831 107 478ms 2 Jul 2024 306th error256 831 118 68ms 27 Nov 2024 307th nwellnhof 🇩🇪 830 79 34ms 2 Jul 2024 307th KatieLG 🇬🇧 830 79 39ms 7 Jan 2026 307th blaztoma 🇱🇹 830 79 36ms 18 days ago 310th JayXon 🇺🇸 830 235 1,661ms 24 Dec 2025 311th Natanaelel 🇸🇪 829 67 171ms 1 Jul 2024 312th lyphyser 829 76 54ms 5 Jul 2024 313th DialFrost 🇸🇬 829 82 262ms 22 Nov 2025 314th Natanaelel 🇸🇪 829 96 1,279ms 1 Jul 2024 315th xsot 🇸🇬 829 104 2ms 4 Jul 2024 316th emgordon154 827 124 2,613ms 2 Apr 2025 317th GrayJoKing 🇦🇺 827 139 395ms 6 Jul 2024 318th kg583 🇺🇸 827 149 5ms 15 days ago 319th ovs-code 🇩🇪 826 111 16ms 1 Jul 2024 319th kops-cg 826 111 17ms 18 Mar 2025 First Prev 241–320 of 735 Next Last