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 559th Alex-x90 🇺🇸 561 139 10ms 14 Jul 2024 559th vhoulbreque 🇫🇷 561 139 38ms 9 Feb 2025 563rd bac0id 561 182 394ms 1 Jul 2024 564th MeWhenI 🇻🇦 560 91 2ms 1 Jul 2024 565th alemelis 559 123 712ms 26 Aug 2024 566th alexsave 559 124 11ms 13 Nov 2024 567th Natanaelel 🇸🇪 557 140 11ms 2 Jul 2024 568th bac0id 551 155 2ms 3 Jul 2024 569th neihousaigaai 549 142 11ms 29 Sep 2024 570th dokutan 549 158 9ms 21 Jul 2025 571st madex 🇩🇪 546 127 12ms 1 Jul 2024 571st weliveinhell 🇭🇹 546 127 11ms 4 Jul 2024 573rd Stockoh 🇫🇷 546 143 11ms 29 Sep 2024 573rd snydej 546 143 31ms 21 Nov 2024 575th MeWhenI 🇻🇦 546 199 1,363ms 2 Jul 2024 576th scpchicken 🇵🇼 542 144 30ms 13 Jul 2024 577th commandz0 🇺🇸 538 145 11ms 1 Jul 2024 577th jared-hughes 538 145 9ms 3 Jul 2024 579th JOrE20 537 125 326ms 24 Dec 2025 580th zakariamouhid 537 129 13ms 3 Jul 2024 581st MeWhenI 🇻🇦 536 162 14ms 2 Jul 2024 582nd MeWhenI 🇻🇦 535 162 10ms 1 Jul 2024 583rd KrausRaus 🇺🇸 534 146 12ms 4 Jul 2024 583rd ComputerKWasTaken 🇺🇸 534 146 12ms 4 Jul 2024 583rd hellwue 534 146 30ms 18 Jul 2024 583rd btjones0 534 146 9ms 7 Feb 2025 587th snoozingnewt 🇨🇦 533 130 11ms 29 Sep 2025 588th Shanethegamer 🇺🇸 532 92 113ms 24 Sep 2024 589th msbranicky 532 134 486ms 1 Jul 2024 590th fgrosshans 🇫🇷 527 148 9ms 9 Jul 2024 591st Salutations45 525 97 2ms 29 Dec 2024 592nd commandz0 🇺🇸 524 136 541ms 1 Sep 2025 593rd StefanHabel 🇨🇦 524 149 11ms 22 Mar 2025 594th BREMAUCY 🇫🇷 520 150 10ms 3 Jul 2024 595th roguh 🇬🇹 517 151 10ms 30 Jul 2024 595th 051 🇸🇬 517 151 15ms 5 Feb 2026 597th dokutan 517 180 214ms 1 Jul 2024 598th luuumine 🇫🇷 514 166 2ms 1 Dec 2025 599th hiichbindermax 513 152 10ms 15 Jul 2024 599th InigoK 🇺🇸 513 152 214ms 4 Sep 2025 599th Andrey2001 513 152 11ms 17 Dec 2025 602nd klixel 🇨🇦 513 259 243ms 9 Jan 2025 603rd MeWhenI 🇻🇦 511 198 47ms 6 Aug 2024 604th msbranicky 511 265 57ms 4 Jul 2024 605th leon-w 510 153 11ms 24 Jul 2024 606th 0xjac 🇨🇭 505 269 285ms 19 Jun 2025 607th CutSandstone 500 156 10ms 2 Jul 2024 608th bac0id 498 225 465ms 1 Jul 2024 609th mbittner20 497 157 10ms 11 Jul 2024 609th Vaekor 497 157 10ms 23 Jul 2024 609th theadamabrams 497 157 11ms 26 Dec 2024 612th coreynash 495 140 11ms 2 Jul 2024 612th two-bad 🇬🇧 495 140 12ms 4 Oct 2024 614th tomh1012 495 206 439ms 11 days ago 615th emgordon154 494 108 34ms 26 Jul 2024 616th jacekwladzinski 491 159 10ms 7 Oct 2025 617th MeWhenI 🇻🇦 491 172 11ms 13 Aug 2024 618th olleicua 🇺🇸 489 109 36ms 3 Jul 2024 619th vgamula 🇺🇦 488 160 31ms 3 Jul 2024 620th JOrE20 485 161 10ms 5 Feb 2026 621st dieggsy 485 209 15ms 16 Oct 2024 622nd jtaxen 482 162 12ms 2 Jul 2024 622nd nstearns96 🇬🇧 482 162 11ms 9 Jul 2024 624th CatsAreFluffy 482 227 62ms 3 Nov 2024 625th MeWhenI 🇻🇦 482 235 32ms 1 Jul 2024 626th dokutan 480 231 43ms 27 Aug 2024 627th Pyroan 479 163 10ms 14 May 2025 628th edsrzf 🇳🇿 479 181 10ms 24 Nov 2024 629th OCNeve 476 164 10ms 3 Jul 2024 629th muser-logiccpu 🇺🇦 476 164 10ms 9 Aug 2025 631st MeWhenI 🇻🇦 476 179 68ms 9 Aug 2024 632nd emgordon154 474 183 8ms 13 Dec 2024 633rd AtengChen 473 165 11ms 14 Aug 2024 634th msbranicky 471 146 196ms 4 Jul 2024 635th ComputerKWasTaken 🇺🇸 470 210 2ms 1 Jul 2024 636th Andrey2001 469 152 554ms 28 Jan 2026 637th blaztoma 🇱🇹 469 240 115ms 11 Jan 2026 638th iczelia 🇩🇪 466 183 2ms 16 Oct 2025 639th snoozingnewt 🇨🇦 464 184 2ms 9 Oct 2025 640th acollett89 462 150 10ms 5 Aug 2025 First Prev 561–640 of 731 Next Last