The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 hours. 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 641st snoozingnewt 🇨🇦 464 184 2ms 9 Oct 2025 642nd acollett89 462 150 10ms 5 Aug 2025 643rd xyangst 459 151 11ms 15 Oct 2024 644th marcin7Cd 459 170 9ms 11 Jul 2024 644th Mabeloid 🇳🇴 459 170 13ms 17 Sep 2024 644th YAJUE114514 459 170 11ms 31 Jul 2025 647th sheen4n 456 171 11ms 21 Jul 2024 648th jtaxen 455 250 127ms 2 Jul 2024 649th FortuiteMan 🇫🇷 453 126 14ms 18 Jan 2026 650th klixel 🇨🇦 451 173 13ms 20 Jan 2025 651st croc54 448 174 9ms 17 Jan 2025 652nd JOrE20 447 154 242ms 24 Dec 2025 653rd MeWhenI 🇻🇦 443 152 12ms 1 Jul 2024 654th madex 🇩🇪 442 180 1,315ms 1 Jul 2024 655th coldham10 438 178 11ms 13 Jan 2026 656th snoozingnewt 🇨🇦 436 86 3ms 7 Oct 2025 657th c4augustus 431 87 2ms 16 Jul 2024 658th Flobois 425 158 271ms 23 Jul 2024 659th MeWhenI 🇻🇦 422 116 143ms 7 Aug 2024 660th madex 🇩🇪 420 127 36ms 1 Jul 2024 661st Mabeloid 🇳🇴 419 170 462ms 17 Sep 2024 662nd ginop 419 186 9ms 2 Jul 2024 662nd inverseLorentz 🇦🇺 419 186 11ms 8 Jul 2024 664th OllieBoyne 🇬🇧 413 189 11ms 12 Jul 2024 665th Maximizer02 413 210 12ms 24 Jul 2024 666th JDiLenarda 🇫🇷 413 263 1,386ms 31 Aug 2024 667th ComputerKWasTaken 🇺🇸 410 130 35ms 4 Jul 2024 668th CatsAreFluffy 410 208 2ms 3 Nov 2024 669th tomh1012 408 170 10ms 14 days ago 670th tomh1012 408 191 10ms 21 Jan 2026 671st IISResetMe 407 165 292ms 29 Dec 2025 672nd MeWhenI 🇻🇦 406 138 36ms 8 Aug 2024 673rd dokutan 396 170 10ms 15 Aug 2024 674th dokutan 395 174 593ms 2 Jul 2024 675th madex 🇩🇪 388 220 2ms 1 Jul 2024 676th zt14427 384 203 9ms 1 Jul 2024 677th BambooleanLogic 🇸🇪 383 181 10ms 23 Jun 2025 678th madex 🇩🇪 382 349 237ms 1 Jul 2024 679th Msleizak 🇫🇷 381 176 295ms 19 Jul 2024 680th TheZwierzLF 🇵🇱 377 189 585ms 25 Nov 2025 681st ComputerKWasTaken 🇺🇸 377 360 277ms 1 Jul 2024 682nd dokutan 369 250 4ms 15 Jul 2024 683rd jerrandolph 364 373 305ms 21 Sep 2025 684th saito-ta 🇯🇵 358 482 665ms 10 Jul 2024 685th jameswmccarty 353 221 10ms 10 Jul 2024 686th azure-blondon 342 228 10ms 7 Jul 2024 687th yuchuehw 341 229 11ms 5 Jul 2024 688th Schmitt-Very-Cool 325 345 501ms 3 Oct 2025 689th TheZwierzLF 🇵🇱 322 242 13ms 25 Nov 2025 690th galloj 🇨🇿 321 243 15ms 26 Aug 2024 691st JRaspass 🇬🇧 320 198 4ms 1 Jul 2024 692nd MyXoToD 🇩🇪 312 222 9ms 26 May 2025 693rd KatieLG 🇬🇧 310 438 274ms 22 Sep 2024 694th Zhenyu-Bo 283 276 10ms 1 Aug 2025 695th Sascha37 🇩🇪 258 331 2ms 26 Sep 2025 696th madex 🇩🇪 247 273 32ms 1 Jul 2024 697th KatieLG 🇬🇧 219 467 420ms 13 Oct 2024 698th scpchicken 🇵🇼 158 402 3ms 4 Jul 2024 699th KatieLG 🇬🇧 149 778 125ms 15 Sep 2024 700th KatieLG 🇬🇧 146 913 241ms 15 Sep 2024 701st KatieLG 🇬🇧 142 445 4ms 15 Sep 2024 702nd KatieLG 🇬🇧 139 624 3ms 15 Sep 2024 703rd KatieLG 🇬🇧 128 673 118ms 15 Sep 2024 704th KatieLG 🇬🇧 123 559 215ms 15 Sep 2024 705th KatieLG 🇬🇧 122 926 33ms 15 Sep 2024 706th KatieLG 🇬🇧 121 718 12ms 15 Sep 2024 707th KatieLG 🇬🇧 115 861 2ms 15 Sep 2024 708th dokutan 114 963 69ms 4 Aug 2025 709th AidanWalter 109 716 11ms 3 Jan 2025 710th KatieLG 🇬🇧 104 490 2ms 15 Sep 2024 711th KatieLG 🇬🇧 92 1,193 1,492ms 15 Sep 2024 712th dokutan 89 963 2ms 4 Aug 2025 713th KatieLG 🇬🇧 88 825 114ms 15 Sep 2024 714th CaedenHarper 🇨🇦 79 723 151ms 11 Nov 2025 715th MeWhenI 🇻🇦 13 9,255 5ms 1 Jul 2024 716th namelessiw 0 22 149ms 25 Oct 2025 716th 2bular 0 22 64ms 11 days ago 716th darrenks 🇺🇸 0 22 103ms 11 days ago 719th Natanaelel 🇸🇪 0 23 69ms 11 days ago 720th kg583 🇺🇸 0 25 1,330ms 14 May 2025 First Prev 641–720 of 734 Next Last