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?
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 401st annaproxy 686 144 117ms 15 Apr 2022 402nd Shanethegamer 🇺🇸 684 92 10ms 27 Jan 2022 402nd ovs-code 🇩🇪 684 92 9ms 11 Mar 2024 404th Yewzir 🇧🇪 684 122 6ms 18 Dec 2023 405th Yewzir 🇧🇪 684 170 396ms 2 Oct 2025 405th stefangimmillaro 684 170 505ms 6 Oct 2025 407th CLOStrophobic 🇮🇹 683 145 5ms 1 Mar 2025 408th JRaspass 🇬🇧 682 104 3ms 10 Jun 2022 408th nephila-nacrea 🇬🇧 682 104 3ms 10 Jun 2022 410th dokutan 682 139 145ms 28 Mar 2024 411th DialFrost 🇸🇬 680 130 4ms 17 Nov 2023 412th AlephSquirrel 680 135 4ms 22 Apr 2023 413th HumanoidCPU 679 359 10ms 21 May 2024 414th GrayJoKing 🇦🇺 678 101 72ms 9 Dec 2023 415th MeWhenI 🇻🇦 677 79 31ms 16 Aug 2022 416th MeWhenI 🇻🇦 677 175 3ms 24 Jul 2023 417th lynn 676 93 9ms 27 Jan 2022 417th prplz 🇦🇺 676 93 9ms 25 May 2022 417th Seek64 🇩🇪 676 93 10ms 30 Sep 2023 417th blaztoma 🇱🇹 676 93 9ms 23 days ago 421st stefangimmillaro 674 151 446ms 11 Nov 2024 422nd ovs-code 🇩🇪 673 90 470ms 11 Mar 2024 423rd MeWhenI 🇻🇦 670 192 274ms 9 Feb 2023 424th DialFrost 🇸🇬 669 94 10ms 2 Oct 2023 424th davecame 669 94 9ms 30 Sep 2024 426th AlephSquirrel 669 148 5ms 17 Mar 2023 427th Natanaelel 🇸🇪 668 148 127ms 16 Jun 2025 428th Yewzir 🇧🇪 668 160 133ms 4 Feb 2024 429th dokutan 665 367 10ms 31 Oct 2023 429th CaedenHarper 🇨🇦 665 367 10ms 24 Jan 2025 431st PixelSoftwareStudios 🇺🇸 662 95 11ms 11 Jun 2024 432nd Shanethegamer 🇺🇸 661 116 85ms 15 Jan 2023 433rd DialFrost 🇸🇬 660 169 124ms 25 Dec 2023 434th dokutan 660 195 301ms 1 Apr 2024 435th Yewzir 🇧🇪 659 115 945ms 15 Nov 2025 436th tayloia 🇬🇧 659 123 9ms 2 May 2023 436th targrik 659 123 9ms 9 Jun 2025 438th yzhs 🇩🇪 659 150 114ms 26 Jun 2023 439th Alessandro-Balconi 🇮🇹 658 90 89ms 15 Jul 2023 439th DialFrost 🇸🇬 658 90 87ms 18 Mar 2025 441st jared-hughes 658 128 2ms 17 Jul 2022 442nd Jasper-Ty 🇵🇭 657 136 1ms 27 Apr 2024 443rd dokutan 657 167 2ms 13 Apr 2024 444th emgordon154 657 169 76ms 8 Feb 2026 445th HumanoidCPU 657 182 3ms 20 Nov 2025 446th emgordon154 657 196 297ms 17 Jan 2025 447th dokutan 656 165 1ms 1 Apr 2024 448th stefangimmillaro 655 169 102ms 31 Aug 2023 449th Yewzir 🇧🇪 654 145 151ms 22 Dec 2024 450th DialFrost 🇸🇬 653 150 2ms 15 Apr 2025 451st sean-niemann 🇺🇸 652 112 2ms 19 Nov 2023 452nd stefangimmillaro 651 169 133ms 13 Nov 2023 453rd pschmid0 🇺🇸 650 136 4ms 23 Oct 2022 454th BlankSpruce 650 171 63ms 9 Jan 2026 455th namelessiw 648 97 10ms 10 Apr 2024 456th error256 648 138 2ms 24 Dec 2024 457th blaztoma 🇱🇹 647 205 42ms 27 Dec 2025 458th Yewzir 🇧🇪 646 113 1ms 21 Dec 2023 459th snoozingnewt 🇨🇦 646 137 5ms 16 Sep 2025 460th nwellnhof 🇩🇪 645 83 33ms 5 Oct 2022 460th tatzyr 🇯🇵 645 83 38ms 15 Feb 2025 462nd duckyluuk 🇳🇱 644 186 9ms 18 Dec 2024 463rd madex 🇩🇪 643 139 1ms 18 Mar 2022 464th m-tkach 🇺🇦 640 153 2ms 27 Oct 2022 465th HumanoidCPU 639 174 74ms 29 Aug 2024 466th stefangimmillaro 638 127 11ms 27 Sep 2024 467th hemphen 636 160 412ms 6 Aug 2022 468th emgordon154 636 234 4ms 21 Oct 2025 469th Flekay 🇩🇪 635 99 9ms 15 Feb 2026 470th MeWhenI 🇻🇦 630 179 448ms 4 Mar 2022 471st ryyyn 🇺🇸 629 100 10ms 15 Dec 2025 472nd MeWhenI 🇻🇦 629 185 495ms 7 Nov 2025 473rd KenanSi 628 48 2ms 24 Feb 2022 474th Yax42 🇫🇷 628 129 10ms 20 Jan 2026 475th Yewzir 🇧🇪 628 162 374ms 30 Dec 2023 476th tobeannouncd 626 158 120ms 10 Jan 2024 477th lynn 625 241 6ms 16 Mar 2023 478th namelessiw 624 97 424ms 10 Apr 2024 479th DialFrost 🇸🇬 624 117 1ms 21 Dec 2024 480th SB-945 623 101 10ms 12 Apr 2024 First Prev 401–480 of 1,769 Next Last