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 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 481st Shanethegamer 🇺🇸 731 93 297ms 13 Sep 2024 482nd MeWhenI 🇻🇦 731 118 2ms 5 Jul 2024 482nd Shanethegamer 🇺🇸 731 118 2ms 25 Feb 2025 484th emgordon154 730 109 1,186ms 2 Apr 2025 485th Natanaelel 🇸🇪 729 95 10ms 1 Jul 2024 485th CaedenHarper 🇨🇦 729 95 11ms 23 Aug 2025 487th KatieLG 🇬🇧 729 122 577ms 7 Jan 2026 488th Shanethegamer 🇺🇸 729 139 14ms 13 Sep 2024 489th fgrosshans 🇫🇷 723 148 9ms 9 Jul 2024 490th Shanethegamer 🇺🇸 723 158 38ms 13 Sep 2024 491st MeWhenI 🇻🇦 723 184 196ms 7 Aug 2024 492nd MeWhenI 🇻🇦 723 282 1,482ms 9 Feb 2025 493rd MeWhenI 🇻🇦 722 107 155ms 3 Aug 2024 494th msbranicky 721 186 3ms 3 Jul 2024 495th Shanethegamer 🇺🇸 720 88 3ms 13 Sep 2024 496th Natanaelel 🇸🇪 720 158 162ms 1 Jul 2024 496th edsrzf 🇳🇿 720 158 139ms 30 Dec 2025 498th MeWhenI 🇻🇦 720 162 14ms 2 Jul 2024 499th CatsAreFluffy 719 185 173ms 16 Nov 2024 500th msbranicky 718 118 2ms 3 Jul 2024 501st StefanHabel 🇨🇦 718 149 11ms 22 Mar 2025 501st luuumine 🇫🇷 718 149 10ms 1 Dec 2025 503rd emgordon154 717 140 7ms 12 Jan 2025 504th edsrzf 🇳🇿 717 157 121ms 31 Dec 2025 505th GolfingSuccess 🇬🇷 716 172 75ms 7 days ago 506th jared-hughes 715 138 2ms 4 Jul 2024 507th tobeannouncd 715 159 141ms 25 Apr 2025 508th elgan65536 🇺🇸 715 186 167ms 7 Feb 2026 509th prestosilver 🇺🇸 714 161 413ms 2 Feb 2026 510th BREMAUCY 🇫🇷 713 150 10ms 3 Jul 2024 511th anter69 🇭🇺 711 112 1,291ms 23 Jan 2026 512th roguh 🇬🇹 709 151 10ms 30 Jul 2024 512th 051 🇸🇬 709 151 15ms 5 Feb 2026 514th MeWhenI 🇻🇦 709 154 4ms 9 Aug 2024 515th dcgjb 708 96 299ms 3 Jul 2024 516th DialFrost 🇸🇬 708 122 112ms 15 Dec 2024 517th anter69 🇭🇺 705 93 35ms 23 Jan 2026 518th hiichbindermax 704 152 10ms 15 Jul 2024 518th RaBa21 🇭🇺 704 152 10ms 12 Jul 2025 518th InigoK 🇺🇸 704 152 214ms 4 Sep 2025 518th Andrey2001 704 152 11ms 17 Dec 2025 522nd MostParsingVex 701 123 2ms 1 Jul 2024 523rd targrik 699 101 5ms 18 May 2025 524th leon-w 699 153 11ms 24 Jul 2024 525th jared-hughes 695 124 2ms 3 Jul 2024 526th emgordon154 693 158 65ms 8 Feb 2026 527th tatzyr 🇯🇵 690 95 33ms 25 Mar 2025 528th Salutations45 686 101 10ms 27 Nov 2024 529th Shanethegamer 🇺🇸 686 103 5ms 13 Sep 2024 530th HumanoidCPU 686 156 10ms 1 Jul 2024 530th CutSandstone 686 156 10ms 2 Jul 2024 532nd Jacob385 684 164 431ms 16 Aug 2024 533rd albanian-laundromat 683 159 1,347ms 22 days ago 534th blaztoma 🇱🇹 682 55 3ms 11 Feb 2026 535th UnderKoen 🇳🇱 682 177 1,225ms 2 Jul 2024 536th mbittner20 681 157 10ms 11 Jul 2024 536th Vaekor 681 157 10ms 23 Jul 2024 536th theadamabrams 681 157 11ms 26 Dec 2024 539th Alex-x90 🇺🇸 679 127 2ms 12 Jul 2024 540th gigaprofisi 🇺🇸 673 103 11ms 21 Jun 2025 541st jacekwladzinski 673 159 10ms 7 Oct 2025 542nd iczelia 🇩🇪 673 169 145ms 16 Oct 2025 543rd MeWhenI 🇻🇦 671 105 203ms 2 Jul 2024 544th dokutan 671 200 2ms 4 Feb 2025 545th vgamula 🇺🇦 669 160 31ms 3 Jul 2024 546th brimstonetrader 669 170 132ms 10 Jul 2024 547th SirBogman 🇺🇸 667 153 433ms 4 Jul 2024 548th Shanethegamer 🇺🇸 667 203 58ms 13 Sep 2024 549th thisishowmymindworks 🇳🇴 666 104 11ms 1 Jul 2024 550th JOrE20 665 161 10ms 5 Feb 2026 551st msbranicky 664 134 486ms 1 Jul 2024 551st Babafaba 664 134 486ms 2 Nov 2025 553rd jtaxen 660 162 12ms 2 Jul 2024 553rd nstearns96 🇬🇧 660 162 11ms 9 Jul 2024 553rd wuzekai518 660 162 12ms 23 Jul 2024 556th LHLaurini 🇧🇷 658 131 2ms 1 Jul 2024 557th MeWhenI 🇻🇦 658 162 10ms 1 Jul 2024 558th Pyroan 656 163 10ms 14 May 2025 559th CaedenHarper 🇨🇦 656 171 357ms 6 days ago 560th KatieLG 🇬🇧 656 184 948ms 11 Aug 2024 First Prev 481–560 of 733 Next Last