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 641st bac0id 498 225 465ms 1 Jul 2024 642nd coreynash 495 140 11ms 2 Jul 2024 642nd two-bad 🇬🇧 495 140 12ms 4 Oct 2024 644th tomh1012 495 206 439ms 12 days ago 645th MeWhenI 🇻🇦 491 172 11ms 13 Aug 2024 646th dieggsy 485 209 15ms 16 Oct 2024 647th jameswmccarty 484 221 10ms 10 Jul 2024 648th msbranicky 483 146 196ms 4 Jul 2024 649th CatsAreFluffy 482 227 62ms 3 Nov 2024 650th MeWhenI 🇻🇦 482 235 32ms 1 Jul 2024 651st MeWhenI 🇻🇦 479 116 120ms 7 Aug 2024 652nd iczelia 🇩🇪 471 183 2ms 16 Oct 2025 653rd ComputerKWasTaken 🇺🇸 470 210 2ms 1 Jul 2024 654th snoozingnewt 🇨🇦 469 184 2ms 9 Oct 2025 655th azure-blondon 469 228 10ms 7 Jul 2024 656th blaztoma 🇱🇹 469 240 115ms 11 Jan 2026 657th yuchuehw 467 229 11ms 5 Jul 2024 658th FortuiteMan 🇫🇷 463 130 14ms 18 Jan 2026 659th TheZwierzLF 🇵🇱 463 192 616ms 14 Dec 2025 660th acollett89 462 150 10ms 5 Aug 2025 661st Mabeloid 🇳🇴 461 193 501ms 17 Sep 2024 662nd xyangst 459 151 11ms 15 Oct 2024 663rd JOrE20 458 154 242ms 24 Dec 2025 664th jtaxen 455 250 127ms 2 Jul 2024 665th LHLaurini 🇧🇷 453 139 49ms 1 Jul 2024 666th MeWhenI 🇻🇦 443 152 12ms 1 Jul 2024 667th madex 🇩🇪 442 180 1,315ms 1 Jul 2024 668th TheZwierzLF 🇵🇱 442 242 13ms 25 Nov 2025 669th galloj 🇨🇿 440 243 15ms 26 Aug 2024 670th dokutan 437 244 7ms 17 Jul 2025 671st snoozingnewt 🇨🇦 436 86 3ms 7 Oct 2025 672nd c4augustus 431 87 2ms 16 Jul 2024 673rd Flobois 430 158 271ms 23 Jul 2024 674th CatsAreFluffy 415 208 2ms 3 Nov 2024 675th JDiLenarda 🇫🇷 413 263 1,386ms 31 Aug 2024 676th IISResetMe 412 165 292ms 29 Dec 2025 677th madex 🇩🇪 412 168 11ms 1 Jul 2024 678th tomh1012 408 170 10ms 12 days ago 679th MeWhenI 🇻🇦 406 138 36ms 8 Aug 2024 680th dokutan 401 250 4ms 15 Jul 2024 681st dokutan 396 170 10ms 15 Aug 2024 682nd madex 🇩🇪 392 220 2ms 1 Jul 2024 683rd Zhenyu-Bo 388 276 10ms 1 Aug 2025 684th Msleizak 🇫🇷 386 176 295ms 19 Jul 2024 685th BambooleanLogic 🇸🇪 383 181 10ms 23 Jun 2025 686th madex 🇩🇪 381 349 237ms 1 Jul 2024 687th ComputerKWasTaken 🇺🇸 377 360 277ms 1 Jul 2024 688th jerrandolph 364 373 305ms 21 Sep 2025 689th dokutan 363 194 339ms 2 Jul 2024 690th saito-ta 🇯🇵 358 482 665ms 10 Jul 2024 691st dokutan 346 330 40ms 27 Aug 2024 692nd Schmitt-Very-Cool 325 345 501ms 3 Oct 2025 693rd JRaspass 🇬🇧 320 198 3ms 1 Jul 2024 694th MyXoToD 🇩🇪 312 222 10ms 26 May 2025 695th KatieLG 🇬🇧 310 438 274ms 22 Sep 2024 696th Sascha37 🇩🇪 261 331 2ms 26 Sep 2025 697th madex 🇩🇪 247 273 32ms 1 Jul 2024 698th KatieLG 🇬🇧 219 467 420ms 13 Oct 2024 699th KatieLG 🇬🇧 187 624 3ms 15 Sep 2024 700th scpchicken 🇵🇼 158 402 3ms 4 Jul 2024 701st AidanWalter 149 716 11ms 3 Jan 2025 702nd KatieLG 🇬🇧 149 718 12ms 15 Sep 2024 703rd KatieLG 🇬🇧 149 778 128ms 15 Sep 2024 704th KatieLG 🇬🇧 146 913 243ms 15 Sep 2024 705th KatieLG 🇬🇧 142 445 4ms 15 Sep 2024 706th KatieLG 🇬🇧 128 673 118ms 15 Sep 2024 707th KatieLG 🇬🇧 126 559 215ms 15 Sep 2024 708th KatieLG 🇬🇧 122 926 33ms 15 Sep 2024 709th KatieLG 🇬🇧 115 861 2ms 15 Sep 2024 710th dokutan 114 963 69ms 4 Aug 2025 711th KatieLG 🇬🇧 104 490 2ms 15 Sep 2024 712th KatieLG 🇬🇧 104 825 114ms 15 Sep 2024 713th KatieLG 🇬🇧 92 1,193 1,492ms 15 Sep 2024 714th dokutan 90 963 2ms 4 Aug 2025 715th CaedenHarper 🇨🇦 83 724 151ms 11 Nov 2025 716th MeWhenI 🇻🇦 13 9,255 5ms 1 Jul 2024 717th 2bular 0 22 58ms 10 days ago 717th darrenks 🇺🇸 0 22 83ms 10 days ago 719th Natanaelel 🇸🇪 0 23 56ms 10 days ago 720th namelessiw 0 29 149ms 25 Oct 2025 First Prev 641–720 of 735 Next Last