The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 472nd Flekay 🇩🇪 656 119 11ms 12 Feb 2026 472nd edsrzf 🇳🇿 656 119 12ms 15 days ago 472nd aksyristos 656 119 13ms 34 hours ago 484th CaedenHarper 🇨🇦 656 171 357ms 6 days ago 485th KatieLG 🇬🇧 656 184 948ms 11 Aug 2024 486th MeWhenI 🇻🇦 655 105 203ms 2 Jul 2024 487th snoozingnewt 🇨🇦 654 177 108ms 8 Oct 2025 488th LHLaurini 🇧🇷 652 131 2ms 1 Jul 2024 489th error256 650 120 11ms 1 Jul 2024 489th rschwa6308 🇺🇸 650 120 13ms 11 Jul 2024 489th ahmetdemirag 🇨🇾 650 120 33ms 13 Feb 2025 492nd inventshah 648 110 455ms 25 Jul 2024 493rd kmathis22 648 173 566ms 22 Oct 2025 494th emgordon154 644 97 165ms 14 Nov 2024 495th SirBogman 🇺🇸 643 83 40ms 1 Jul 2024 496th CaedenHarper 🇨🇦 642 159 408ms 17 Oct 2025 497th CaedenHarper 🇨🇦 639 122 12ms 2 Sep 2024 497th Bulmenisaurus 639 122 11ms 9 Oct 2024 497th solisolu 639 122 12ms 9 Nov 2025 497th ryyyn 🇺🇸 639 122 30ms 10 Feb 2026 501st DialFrost 🇸🇬 637 136 11ms 3 Jan 2026 502nd MeWhenI 🇻🇦 636 111 5ms 1 Jul 2024 503rd MeWhenI 🇻🇦 636 112 516ms 1 Jul 2024 504th bnic24 634 123 11ms 29 Jul 2024 504th iosovi 🇷🇴 634 123 11ms 9 Aug 2024 504th robin-scragg 634 123 10ms 25 Jun 2025 504th KasperKivimaeki 🇫🇮 634 123 11ms 5 Jul 2025 504th fuzzylojik-golf 🇺🇸 634 123 11ms 6 Jul 2025 504th Matter1024 🇮🇳 634 123 12ms 27 days ago 510th Feniske 🇫🇷 633 106 284ms 20 Jul 2024 511th msbranicky 632 156 2ms 5 Jul 2024 512th CaedenHarper 🇨🇦 631 113 463ms 4 Oct 2024 512th fuzzylojik-golf 🇺🇸 631 113 473ms 6 Jul 2025 514th MeWhenI 🇻🇦 630 137 110ms 1 Jul 2024 515th msbranicky 630 184 98ms 5 Jul 2024 516th mousetail 🇳🇱 629 124 11ms 2 Jul 2024 516th codingisgreatbutiamnot 629 124 11ms 24 Aug 2024 516th mathisfun271 629 124 33ms 3 Oct 2024 516th Lv0Sys 🇵🇱 629 124 11ms 23 Feb 2026 520th msbranicky 629 163 2,703ms 7 Jan 2025 521st msbranicky 629 216 277ms 4 Jul 2024 522nd SirBogman 🇺🇸 628 200 44ms 3 Jun 2025 523rd KatieLG 🇬🇧 624 111 13ms 5 Oct 2025 524th error256 624 139 11ms 17 Sep 2024 525th mousetail 🇳🇱 623 137 2ms 1 Jul 2024 526th bac0id 622 176 461ms 1 Jul 2024 527th msbranicky 622 185 363ms 5 Jul 2024 528th zbreit 🇺🇸 619 126 11ms 9 Jul 2024 528th StardustGogeta 619 126 11ms 9 Jul 2024 528th andrewjc2000 619 126 13ms 25 Jul 2025 528th annaproxy 619 126 11ms 31 Aug 2025 532nd stefangimmillaro 614 127 12ms 22 Aug 2024 533rd rucin93 🇵🇱 613 102 150ms 31 Oct 2024 534th error256 607 103 160ms 13 Aug 2024 535th dokutan 606 88 37ms 6 Oct 2024 536th LukeBridges 🇬🇧 602 115 12ms 10 Oct 2024 537th jared-hughes 596 113 21ms 4 Jul 2024 538th moustave 596 131 11ms 31 Mar 2025 539th error256 594 120 554ms 13 Aug 2024 540th junkondo-jp 592 117 13ms 15 Dec 2024 541st adamnielson42 🇺🇸 591 132 10ms 7 Oct 2024 542nd Emutis 🇱🇹 587 133 10ms 27 days ago 543rd MeWhenI 🇻🇦 584 107 155ms 3 Aug 2024 544th MeWhenI 🇻🇦 583 193 123ms 1 Jul 2024 545th msbranicky 582 134 10ms 1 Jul 2024 546th FortuiteMan 🇫🇷 578 135 10ms 20 Dec 2025 547th Program-Pi 577 120 14ms 26 Feb 2026 548th MeWhenI 🇻🇦 576 160 4ms 2 Jul 2024 549th guilhem-roy 🇫🇷 574 136 847ms 10 Jul 2024 549th aalec 574 136 9ms 22 Nov 2025 551st wobblybits 569 137 10ms 19 Aug 2025 551st shelerr 569 137 10ms 22 Aug 2025 551st retrohun 569 137 11ms 23 Oct 2025 551st kitotch 569 137 11ms 7 days ago 555th msbranicky 566 235 175ms 4 Jul 2024 556th ZakkkkAttackkkk 🇵🇭 565 138 12ms 2 Jul 2024 556th dirckvdende 565 138 11ms 2 Aug 2025 558th msbranicky 563 165 211ms 4 Jul 2024 559th elgan65536 🇺🇸 561 139 10ms 5 Jul 2024 559th cykim8811 561 139 10ms 10 Jul 2024 First Prev 481–560 of 731 Next Last