The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 19 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 MeWhenI 🇻🇦 575 197 28ms 6 Jun 2023 562nd MeWhenI 🇻🇦 574 160 4ms 23 May 2023 563rd KasperKivimaeki 🇫🇮 572 110 10ms 4 Dec 2025 564th elephantpanda 572 232 35ms 10 Aug 2022 565th MeWhenI 🇻🇦 572 260 2ms 20 Apr 2022 566th Yewzir 🇧🇪 570 161 4ms 14 May 2023 567th MeWhenI 🇻🇦 568 188 110ms 16 Oct 2022 568th michaelmoynihan 567 111 9ms 5 Jan 2026 569th rucin93 🇵🇱 564 121 152ms 27 Dec 2024 570th jared-hughes 563 95 35ms 20 Sep 2022 571st FortuiteMan 🇫🇷 562 112 9ms 5 Oct 2023 571st wh3n3v3r 🇨🇿 562 112 11ms 12 Nov 2024 571st YAJUE114514 562 112 10ms 10 Dec 2025 574th dokutan 562 164 6ms 23 Feb 2026 575th rak1507 🇬🇧 561 41 33ms 26 Jan 2022 575th jared-hughes 561 41 33ms 29 Mar 2022 575th DialFrost 🇸🇬 561 41 33ms 27 Jan 2023 578th dokutan 561 244 16ms 9 days ago 579th msbranicky 561 435 10ms 19 Sep 2023 580th w911 560 158 4ms 10 Oct 2024 581st junkondo-jp 559 145 10ms 1 Jun 2024 582nd aposteriorist 🇨🇦 557 113 9ms 30 Jan 2022 582nd aksyristos 557 113 9ms 30 Dec 2022 584th nipzu 556 198 120ms 3 Sep 2022 585th vroup 🇩🇰 555 146 10ms 29 Sep 2022 585th janbehrens 🇩🇪 555 146 8ms 9 Aug 2023 587th GrayJoKing 🇦🇺 555 181 19ms 8 Mar 2023 588th MeWhenI 🇻🇦 554 177 2ms 12 Sep 2022 589th msbranicky 551 199 2ms 27 Jul 2023 590th MeWhenI 🇻🇦 549 161 5ms 28 May 2023 591st dokutan 548 163 2ms 1 Apr 2024 592nd yzhs 🇩🇪 547 115 17ms 3 Jun 2022 592nd RYNO8 547 115 10ms 25 Aug 2023 594th coreynash 547 148 10ms 27 Nov 2023 595th retrohun 547 228 2ms 1 Jan 2023 596th stefangimmillaro 546 98 35ms 8 Aug 2023 597th janbehrens 🇩🇪 546 162 5ms 2 Jul 2023 598th CaedenHarper 🇨🇦 545 111 439ms 1 Jan 2026 599th MeWhenI 🇻🇦 545 164 1ms 26 May 2023 600th dokutan 545 211 1,026ms 1 Dec 2025 601st MeWhenI 🇻🇦 545 229 2ms 12 May 2022 601st GolfingSuccess 🇬🇷 545 229 2ms 16 May 2022 601st Natanaelel 🇸🇪 545 229 2ms 19 May 2022 601st lynn 545 229 2ms 27 May 2022 601st inventshah 545 229 2ms 4 Jun 2022 601st sisyphus-ppcg 🇦🇺 545 229 2ms 8 Jul 2022 601st galloj 🇨🇿 545 229 2ms 25 Aug 2022 601st dokutan 545 229 2ms 5 Oct 2023 601st stefangimmillaro 545 229 2ms 15 Jul 2025 610th Yewzir 🇧🇪 543 158 1ms 15 Oct 2023 611th Bubbler-4 542 116 9ms 28 Jan 2022 612th klixel 🇨🇦 542 205 465ms 17 May 2023 613th SirBogman 🇺🇸 540 112 552ms 20 Jan 2024 614th Salutations45 540 150 9ms 9 Jan 2025 615th snobee 🇨🇦 540 204 148ms 12 Dec 2022 616th MeWhenI 🇻🇦 538 56 2ms 26 Jan 2022 617th mathisfun271 538 117 9ms 15 Dec 2023 617th elgan65536 🇺🇸 538 117 11ms 7 Mar 2024 617th CaedenHarper 🇨🇦 538 117 11ms 6 Oct 2025 620th Natanaelel 🇸🇪 537 132 3ms 25 May 2022 621st Natanaelel 🇸🇪 537 151 9ms 26 Apr 2022 622nd HumanoidCPU 537 184 121ms 29 Aug 2024 623rd ashtraypettingzoo 🇺🇸 535 43 32ms 23 Feb 2023 624th non-bin 530 153 10ms 26 Jun 2025 624th madeforlosers 530 153 11ms 14 hours ago 626th msbranicky 530 243 291ms 15 Sep 2023 627th InigoK 🇺🇸 528 119 9ms 8 Jun 2023 628th janbehrens 🇩🇪 526 170 1ms 20 Jul 2022 629th Ripick 526 212 411ms 11 Aug 2024 630th Alex-x90 🇺🇸 524 120 9ms 15 Sep 2023 630th fourth-bit 524 120 9ms 8 Oct 2024 630th solisolu 524 120 10ms 22 days ago 633rd BambooleanLogic 🇸🇪 523 155 9ms 22 Aug 2022 634th angel-p57 🇯🇵 523 434 1ms 26 Nov 2023 635th KatieLG 🇬🇧 520 121 22ms 11 Dec 2022 635th betaveros 520 121 9ms 6 Jan 2023 637th dokutan 520 159 8ms 1 Apr 2024 638th Qruintrox 520 172 2ms 25 Jun 2023 639th zakariamouhid 519 156 10ms 5 Mar 2023 640th OmameBeans 517 197 399ms 27 Jun 2025 First Prev 561–640 of 1,806 Next Last