The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 471st edsrzf 🇳🇿 656 119 12ms 14 days ago 471st aksyristos 656 119 13ms 5 hours ago 483rd CaedenHarper 🇨🇦 656 171 357ms 5 days ago 484th KatieLG 🇬🇧 656 184 948ms 11 Aug 2024 485th MeWhenI 🇻🇦 655 105 203ms 2 Jul 2024 486th snoozingnewt 🇨🇦 654 177 108ms 8 Oct 2025 487th LHLaurini 🇧🇷 652 131 2ms 1 Jul 2024 488th error256 650 120 11ms 1 Jul 2024 488th rschwa6308 🇺🇸 650 120 13ms 11 Jul 2024 488th ahmetdemirag 🇨🇾 650 120 33ms 13 Feb 2025 491st inventshah 648 110 455ms 25 Jul 2024 492nd kmathis22 648 173 566ms 22 Oct 2025 493rd emgordon154 644 97 165ms 14 Nov 2024 494th SirBogman 🇺🇸 643 83 40ms 1 Jul 2024 495th CaedenHarper 🇨🇦 642 159 408ms 17 Oct 2025 496th CaedenHarper 🇨🇦 639 122 12ms 2 Sep 2024 496th Bulmenisaurus 639 122 11ms 9 Oct 2024 496th solisolu 639 122 12ms 9 Nov 2025 496th ryyyn 🇺🇸 639 122 30ms 10 Feb 2026 500th DialFrost 🇸🇬 637 136 11ms 3 Jan 2026 501st MeWhenI 🇻🇦 636 111 5ms 1 Jul 2024 502nd MeWhenI 🇻🇦 636 112 516ms 1 Jul 2024 503rd bnic24 634 123 11ms 29 Jul 2024 503rd iosovi 🇷🇴 634 123 11ms 9 Aug 2024 503rd robin-scragg 634 123 10ms 25 Jun 2025 503rd KasperKivimaeki 🇫🇮 634 123 11ms 5 Jul 2025 503rd fuzzylojik-golf 🇺🇸 634 123 11ms 6 Jul 2025 503rd Matter1024 🇮🇳 634 123 12ms 26 days ago 509th Feniske 🇫🇷 633 106 284ms 20 Jul 2024 510th msbranicky 632 156 2ms 5 Jul 2024 511th CaedenHarper 🇨🇦 631 113 463ms 4 Oct 2024 511th fuzzylojik-golf 🇺🇸 631 113 473ms 6 Jul 2025 513th MeWhenI 🇻🇦 630 137 110ms 1 Jul 2024 514th msbranicky 630 184 98ms 5 Jul 2024 515th mousetail 🇳🇱 629 124 11ms 2 Jul 2024 515th codingisgreatbutiamnot 629 124 11ms 24 Aug 2024 515th mathisfun271 629 124 33ms 3 Oct 2024 515th Lv0Sys 🇵🇱 629 124 11ms 23 Feb 2026 519th msbranicky 629 163 2,703ms 7 Jan 2025 520th msbranicky 629 216 277ms 4 Jul 2024 521st SirBogman 🇺🇸 628 200 44ms 3 Jun 2025 522nd KatieLG 🇬🇧 624 111 13ms 5 Oct 2025 523rd error256 624 139 11ms 17 Sep 2024 524th mousetail 🇳🇱 623 137 2ms 1 Jul 2024 525th bac0id 622 176 461ms 1 Jul 2024 526th msbranicky 622 185 363ms 5 Jul 2024 527th zbreit 🇺🇸 619 126 11ms 9 Jul 2024 527th StardustGogeta 619 126 11ms 9 Jul 2024 527th andrewjc2000 619 126 13ms 25 Jul 2025 527th annaproxy 619 126 11ms 31 Aug 2025 531st stefangimmillaro 614 127 12ms 22 Aug 2024 532nd rucin93 🇵🇱 613 102 150ms 31 Oct 2024 533rd error256 607 103 160ms 13 Aug 2024 534th dokutan 606 88 37ms 6 Oct 2024 535th LukeBridges 🇬🇧 602 115 12ms 10 Oct 2024 536th jared-hughes 596 113 21ms 4 Jul 2024 537th moustave 595 131 11ms 31 Mar 2025 538th error256 594 120 554ms 13 Aug 2024 539th junkondo-jp 592 117 13ms 15 Dec 2024 540th adamnielson42 🇺🇸 591 132 10ms 7 Oct 2024 541st Emutis 🇱🇹 587 133 10ms 26 days ago 542nd MeWhenI 🇻🇦 584 107 155ms 3 Aug 2024 543rd MeWhenI 🇻🇦 583 193 123ms 1 Jul 2024 544th msbranicky 582 134 10ms 1 Jul 2024 545th FortuiteMan 🇫🇷 578 135 10ms 20 Dec 2025 546th Program-Pi 577 120 14ms 26 Feb 2026 547th MeWhenI 🇻🇦 576 160 4ms 2 Jul 2024 548th guilhem-roy 🇫🇷 574 136 847ms 10 Jul 2024 548th aalec 574 136 9ms 22 Nov 2025 550th wobblybits 569 137 10ms 19 Aug 2025 550th shelerr 569 137 10ms 22 Aug 2025 550th retrohun 569 137 11ms 23 Oct 2025 550th kitotch 569 137 11ms 6 days ago 554th msbranicky 566 235 175ms 4 Jul 2024 555th ZakkkkAttackkkk 🇵🇭 565 138 12ms 2 Jul 2024 555th dirckvdende 565 138 11ms 2 Aug 2025 557th msbranicky 563 165 211ms 4 Jul 2024 558th elgan65536 🇺🇸 561 139 10ms 5 Jul 2024 558th cykim8811 561 139 10ms 10 Jul 2024 558th Alex-x90 🇺🇸 561 139 10ms 14 Jul 2024 First Prev 481–560 of 730 Next Last