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?
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 640th betaveros 520 121 9ms 6 Jan 2023 642nd dokutan 520 159 8ms 1 Apr 2024 643rd Qruintrox 520 172 2ms 25 Jun 2023 644th zakariamouhid 519 156 10ms 5 Mar 2023 645th OmameBeans 517 197 399ms 27 Jun 2025 646th elgan65536 🇺🇸 517 213 165ms 6 Mar 2024 647th XenThe 🇬🇧 516 157 9ms 24 Jun 2025 648th albanian-laundromat 516 190 2ms 9 Jul 2025 649th blaztoma 🇱🇹 515 217 120ms 27 Dec 2025 650th DialFrost 🇸🇬 514 104 36ms 5 Jan 2023 651st qrakhen 514 198 401ms 14 Nov 2025 652nd Herbert00709 🇵🇱 512 217 62ms 6 Jan 2025 653rd janbehrens 🇩🇪 509 200 382ms 27 Feb 2022 654th blaztoma 🇱🇹 507 266 26ms 27 Dec 2025 655th two-bad 🇬🇧 506 160 9ms 25 Feb 2024 656th GolfingSuccess 🇬🇷 505 298 6ms 12 Mar 2023 657th weliveinhell 🇭🇹 504 228 1,021ms 2 Oct 2023 658th neel11235813 504 299 6ms 14 Mar 2023 658th dokutan 504 299 7ms 1 Apr 2023 658th jmerle 🇳🇱 504 299 7ms 4 Jul 2023 661st ahmetdemirag 🇨🇾 503 125 13ms 24 Nov 2024 662nd MeWhenI 🇻🇦 501 363 1,746ms 22 Apr 2024 662nd HumanoidCPU 501 363 1,738ms 28 Apr 2024 662nd CaedenHarper 🇨🇦 501 363 1,663ms 16 Aug 2025 662nd msbranicky 501 363 1,653ms 16 Sep 2025 662nd Shanethegamer 🇺🇸 501 363 1,665ms 28 Sep 2025 662nd JOrE20 501 363 1,726ms 16 Feb 2026 668th KatieLG 🇬🇧 500 121 365ms 28 Oct 2024 669th rgthree 500 162 10ms 24 Aug 2023 670th BREMAUCY 🇫🇷 499 126 9ms 19 Aug 2025 671st MeWhenI 🇻🇦 497 177 40ms 29 Apr 2025 672nd vroup 🇩🇰 492 207 412ms 28 Sep 2022 673rd stefangimmillaro 492 217 122ms 25 Oct 2022 674th MeWhenI 🇻🇦 489 47 35ms 26 Jan 2022 674th greenstuartj 489 47 34ms 3 Aug 2023 674th jhfranklin 🇬🇧 489 47 33ms 29 Aug 2023 677th MeWhenI 🇻🇦 489 308 7ms 23 Nov 2023 677th JOrE20 489 308 6ms 21 Nov 2025 679th MeWhenI 🇻🇦 488 124 506ms 13 Jul 2024 680th alexsave 488 166 9ms 24 Dec 2025 681st StevenTolle 488 231 480ms 6 Mar 2022 682nd ndren 487 309 7ms 3 Mar 2024 682nd snoozingnewt 🇨🇦 487 309 7ms 3 Oct 2025 684th DialFrost 🇸🇬 486 62 2ms 31 Jan 2024 685th KatieLG 🇬🇧 486 110 38ms 2 Oct 2025 686th klixel 🇨🇦 486 184 1ms 30 May 2023 687th MeWhenI 🇻🇦 485 158 1,457ms 11 May 2023 688th bbakersmith 485 237 15ms 7 Jun 2022 689th JRaspass 🇬🇧 485 307 1ms 25 Jan 2022 689th KatieLG 🇬🇧 485 307 2ms 27 Jan 2022 689th DaCuteRaccoon 485 307 1ms 15 May 2022 689th KatieLG-Transpiler 🇬🇧 485 307 1ms 24 Jun 2022 689th vroup 🇩🇰 485 307 1ms 28 Sep 2022 689th retrohun 485 307 1ms 28 Dec 2022 689th theunofficialcoder 485 307 1ms 7 Jan 2024 689th dokutan 485 307 1ms 12 Jan 2024 689th HumanoidCPU 485 307 1ms 22 Apr 2024 689th Herbert00709 🇵🇱 485 307 1ms 24 Apr 2024 689th Shanethegamer 🇺🇸 485 307 2ms 15 Aug 2024 689th Mabeloid 🇳🇴 485 307 1ms 4 Oct 2024 689th CaedenHarper 🇨🇦 485 307 2ms 12 Aug 2025 702nd knutae 🇳🇴 484 130 9ms 3 Feb 2022 703rd snoozingnewt 🇨🇦 484 156 72ms 13 Sep 2025 704th aposteriorist 🇨🇦 482 234 446ms 24 Mar 2022 705th Andriamanitra 🇫🇮 481 157 78ms 28 hours ago 706th cros107 🇦🇺 480 131 10ms 25 Dec 2024 706th andrewjc2000 480 131 15ms 31 Jul 2025 708th dokutan 480 158 1,467ms 30 Aug 2025 709th dokutan 480 233 124ms 12 Dec 2025 710th moikaturns 🇬🇧 479 169 11ms 15 Nov 2022 710th xyangst 479 169 10ms 2 Oct 2024 712th janbehrens 🇩🇪 479 243 409ms 16 May 2023 713th JOrE20 477 170 9ms 5 Feb 2026 714th stertooy 🇧🇪 476 132 10ms 14 Jun 2024 714th robin-scragg 476 132 11ms 21 Oct 2025 714th qpwoeirut 476 132 10ms 25 Nov 2025 717th typeswitch-dev 🇵🇹 476 249 3ms 6 Aug 2023 718th CatsAreFluffy 473 318 7ms 12 Mar 2023 718th annaproxy 473 318 6ms 12 Mar 2023 718th HumanoidCPU 473 318 6ms 7 Dec 2025 First Prev 641–720 of 1,816 Next Last