The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 33 hours. Why not try and solve them ahead of time?
Number Spiral 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 561st dokutan 569 244 16ms 8 days ago 562nd MeWhenI 🇻🇦 568 188 110ms 16 Oct 2022 563rd michaelmoynihan 567 111 9ms 5 Jan 2026 564th rucin93 🇵🇱 564 121 152ms 27 Dec 2024 565th jared-hughes 563 95 35ms 20 Sep 2022 566th dokutan 562 164 7ms 23 Feb 2026 567th rak1507 🇬🇧 561 41 33ms 26 Jan 2022 567th jared-hughes 561 41 33ms 29 Mar 2022 567th DialFrost 🇸🇬 561 41 33ms 27 Jan 2023 570th FortuiteMan 🇫🇷 561 112 9ms 5 Oct 2023 570th wh3n3v3r 🇨🇿 561 112 11ms 12 Nov 2024 570th YAJUE114514 561 112 10ms 10 Dec 2025 573rd msbranicky 561 435 10ms 19 Sep 2023 574th w911 560 158 4ms 10 Oct 2024 575th junkondo-jp 559 145 12ms 1 Jun 2024 576th aposteriorist 🇨🇦 557 113 9ms 30 Jan 2022 576th aksyristos 557 113 9ms 30 Dec 2022 578th nipzu 556 198 120ms 3 Sep 2022 579th vroup 🇩🇰 555 146 10ms 29 Sep 2022 579th janbehrens 🇩🇪 555 146 10ms 9 Aug 2023 581st GrayJoKing 🇦🇺 555 181 19ms 8 Mar 2023 582nd MeWhenI 🇻🇦 554 177 2ms 12 Sep 2022 583rd msbranicky 551 199 2ms 27 Jul 2023 584th MeWhenI 🇻🇦 549 161 5ms 28 May 2023 585th dokutan 548 163 2ms 1 Apr 2024 586th yzhs 🇩🇪 547 115 17ms 3 Jun 2022 586th RYNO8 547 115 10ms 25 Aug 2023 588th coreynash 547 148 11ms 27 Nov 2023 589th retrohun 547 228 2ms 1 Jan 2023 590th stefangimmillaro 546 98 35ms 8 Aug 2023 591st janbehrens 🇩🇪 546 162 5ms 2 Jul 2023 592nd CaedenHarper 🇨🇦 545 111 439ms 1 Jan 2026 593rd MeWhenI 🇻🇦 545 164 1ms 26 May 2023 594th dokutan 545 211 1,026ms 1 Dec 2025 595th MeWhenI 🇻🇦 545 229 2ms 12 May 2022 595th GolfingSuccess 🇬🇷 545 229 2ms 16 May 2022 595th Natanaelel 🇸🇪 545 229 2ms 19 May 2022 595th lynn 545 229 2ms 27 May 2022 595th inventshah 545 229 2ms 4 Jun 2022 595th sisyphus-ppcg 🇦🇺 545 229 2ms 8 Jul 2022 595th galloj 🇨🇿 545 229 2ms 25 Aug 2022 595th dokutan 545 229 2ms 5 Oct 2023 595th stefangimmillaro 545 229 2ms 15 Jul 2025 604th Yewzir 🇧🇪 543 158 1ms 15 Oct 2023 605th GolfingSuccess 🇬🇷 543 161 4ms 16 Aug 2024 606th Bubbler-4 542 116 9ms 28 Jan 2022 607th klixel 🇨🇦 542 205 465ms 17 May 2023 608th SirBogman 🇺🇸 540 112 552ms 20 Jan 2024 609th Salutations45 540 150 9ms 9 Jan 2025 610th snobee 🇨🇦 540 204 148ms 12 Dec 2022 611th MeWhenI 🇻🇦 538 56 2ms 26 Jan 2022 612th mathisfun271 538 117 9ms 15 Dec 2023 612th elgan65536 🇺🇸 538 117 11ms 7 Mar 2024 612th CaedenHarper 🇨🇦 538 117 11ms 6 Oct 2025 615th Natanaelel 🇸🇪 537 132 3ms 25 May 2022 616th Natanaelel 🇸🇪 537 151 10ms 26 Apr 2022 617th HumanoidCPU 537 184 121ms 29 Aug 2024 618th ashtraypettingzoo 🇺🇸 535 43 32ms 23 Feb 2023 619th non-bin 530 153 10ms 26 Jun 2025 620th msbranicky 530 243 291ms 15 Sep 2023 621st InigoK 🇺🇸 528 119 9ms 8 Jun 2023 622nd janbehrens 🇩🇪 526 170 1ms 20 Jul 2022 623rd Ripick 526 212 411ms 11 Aug 2024 624th dokutan 525 159 8ms 1 Apr 2024 625th Alex-x90 🇺🇸 524 120 9ms 15 Sep 2023 625th fourth-bit 524 120 9ms 8 Oct 2024 625th solisolu 524 120 10ms 22 days ago 628th BambooleanLogic 🇸🇪 523 155 10ms 22 Aug 2022 629th blaztoma 🇱🇹 523 217 120ms 27 Dec 2025 630th angel-p57 🇯🇵 523 434 1ms 26 Nov 2023 631st KatieLG 🇬🇧 520 121 22ms 11 Dec 2022 631st betaveros 520 121 9ms 6 Jan 2023 633rd Qruintrox 520 172 2ms 25 Jun 2023 634th zakariamouhid 519 156 10ms 5 Mar 2023 635th OmameBeans 517 197 399ms 27 Jun 2025 636th elgan65536 🇺🇸 517 213 165ms 6 Mar 2024 637th XenThe 🇬🇧 516 157 10ms 24 Jun 2025 638th albanian-laundromat 516 190 2ms 9 Jul 2025 639th DialFrost 🇸🇬 514 104 36ms 5 Jan 2023 640th qrakhen 514 198 401ms 14 Nov 2025 First Prev 561–640 of 1,791 Next Last