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 chars. 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 Chars Time Submitted 401st msbranicky 718 118 2ms 3 Jul 2024 402nd edsrzf 🇳🇿 717 157 121ms 31 Dec 2025 403rd SB-945 716 109 11ms 10 Jan 2025 404th Kacarott 🇦🇺 716 119 69ms 2 Jul 2024 405th GolfingSuccess 🇬🇷 716 172 75ms 8 days ago 406th jared-hughes 715 138 2ms 4 Jul 2024 407th tobeannouncd 715 159 141ms 25 Apr 2025 408th elgan65536 🇺🇸 715 186 167ms 7 Feb 2026 409th prestosilver 🇺🇸 714 161 413ms 2 Feb 2026 410th anter69 🇭🇺 711 112 1,291ms 23 Jan 2026 411th MeWhenI 🇻🇦 709 154 4ms 9 Aug 2024 412th DialFrost 🇸🇬 708 122 112ms 15 Dec 2024 413th Shanethegamer 🇺🇸 705 123 7ms 12 Sep 2024 414th jatloe 703 111 10ms 24 Jul 2024 414th dokutan 703 111 10ms 14 Jan 2026 416th tatzyr 🇯🇵 702 76 35ms 24 Feb 2025 417th Shanethegamer 🇺🇸 702 158 38ms 13 Sep 2024 418th MostParsingVex 700 122 2ms 9 Sep 2024 419th targrik 699 101 5ms 18 May 2025 420th Shanethegamer 🇺🇸 694 90 145ms 15 Jan 2025 421st Natanaelel 🇸🇪 693 77 35ms 1 Jul 2024 422nd emgordon154 693 158 65ms 8 Feb 2026 423rd SirBogman 🇺🇸 692 103 450ms 4 Jul 2024 424th dokutan 690 143 2ms 2 Jul 2024 425th jared-hughes 688 124 2ms 3 Jul 2024 426th Salutations45 686 101 10ms 27 Nov 2024 427th Shanethegamer 🇺🇸 686 103 5ms 13 Sep 2024 428th m-tkach 🇺🇦 684 114 30ms 2 Jul 2024 428th kops-cg 684 114 34ms 24 Feb 2025 430th Jacob385 684 164 431ms 16 Aug 2024 431st albanian-laundromat 683 159 1,347ms 23 days ago 432nd blaztoma 🇱🇹 682 55 3ms 11 Feb 2026 433rd UnderKoen 🇳🇱 682 177 1,225ms 2 Jul 2024 434th GolfingSuccess 🇬🇷 679 105 445ms 1 Jul 2024 434th DialFrost 🇸🇬 679 105 378ms 3 Jul 2024 434th m-tkach 🇺🇦 679 105 407ms 5 Jul 2024 437th MeWhenI 🇻🇦 678 107 95ms 7 Aug 2024 438th madex 🇩🇪 678 115 10ms 1 Jul 2024 438th ovs-code 🇩🇪 678 115 11ms 2 Jul 2024 438th bizy-coder 678 115 31ms 2 Jul 2024 438th HPWiz 🇳🇿 678 115 34ms 3 Jul 2024 438th blaztoma 🇱🇹 678 115 12ms 17 days ago 443rd nwellnhof 🇩🇪 675 79 34ms 2 Jul 2024 443rd blaztoma 🇱🇹 675 79 36ms 17 days ago 445th gigaprofisi 🇺🇸 673 103 11ms 21 Jun 2025 446th xnor-gate 673 116 33ms 23 Feb 2025 446th MeWhenI 🇻🇦 673 116 44ms 6 May 2025 448th iczelia 🇩🇪 673 169 145ms 16 Oct 2025 449th Alex-x90 🇺🇸 672 127 2ms 12 Jul 2024 450th dokutan 671 200 2ms 4 Feb 2025 451st brimstonetrader 669 170 132ms 10 Jul 2024 452nd stefangimmillaro 667 80 39ms 22 Aug 2024 452nd Shanethegamer 🇺🇸 667 80 35ms 12 Sep 2024 454th SirBogman 🇺🇸 667 153 433ms 4 Jul 2024 455th Shanethegamer 🇺🇸 667 203 58ms 13 Sep 2024 456th dokutan 666 104 11ms 15 Jun 2025 457th AlephSquirrel 666 107 473ms 2 Jul 2024 457th bizy-coder 666 107 478ms 2 Jul 2024 459th DialFrost 🇸🇬 665 94 147ms 4 Aug 2024 459th dokutan 665 94 139ms 15 Jun 2025 461st lynn 661 118 39ms 1 Jul 2024 461st AlephSquirrel 661 118 31ms 2 Jul 2024 461st Seek64 🇩🇪 661 118 12ms 7 Jul 2024 461st davecame 661 118 13ms 10 Jul 2024 461st Shanethegamer 🇺🇸 661 118 11ms 13 Sep 2024 466th dokutan 660 108 457ms 2 Jul 2024 467th Shanethegamer 🇺🇸 660 110 89ms 13 Sep 2024 468th ovs-code 🇩🇪 660 129 65ms 4 Jul 2024 469th MeWhenI 🇻🇦 659 81 37ms 1 Jul 2024 469th DialFrost 🇸🇬 659 81 36ms 29 Nov 2025 471st emgordon154 658 140 7ms 12 Jan 2025 472nd GolfingSuccess 🇬🇷 656 119 11ms 1 Jul 2024 472nd 5cw 🇺🇸 656 119 12ms 1 Jul 2024 472nd inventshah 656 119 12ms 1 Jul 2024 472nd sisyphus-ppcg 🇦🇺 656 119 34ms 3 Jul 2024 472nd cros107 🇦🇺 656 119 12ms 3 Jul 2024 472nd SirBogman 🇺🇸 656 119 18ms 4 Jul 2024 472nd thatbirdguythatuknownot 656 119 12ms 5 Jul 2024 472nd firegene 🇮🇪 656 119 12ms 1 Aug 2024 472nd bricknellj 656 119 12ms 23 May 2025 First Prev 401–480 of 731 Next Last