The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 16 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 400th firegene 🇮🇪 691 91 11ms 25 Jan 2023 402nd Yewzir 🇧🇪 691 161 467ms 17 Feb 2024 403rd dokutan 689 169 477ms 24 Sep 2025 404th Yewzir 🇧🇪 688 88 426ms 15 Jan 2024 405th Shanethegamer 🇺🇸 687 118 10ms 27 Jan 2022 405th Lv0Sys 🇵🇱 687 118 9ms 27 Feb 2026 407th SirBogman 🇺🇸 686 78 39ms 19 May 2022 408th annaproxy 686 144 117ms 15 Apr 2022 409th edsrzf 🇳🇿 685 44 3ms 21 hours ago 410th Yewzir 🇧🇪 685 170 396ms 2 Oct 2025 410th stefangimmillaro 685 170 505ms 6 Oct 2025 412th Shanethegamer 🇺🇸 684 92 10ms 27 Jan 2022 412th ovs-code 🇩🇪 684 92 9ms 11 Mar 2024 414th MeWhenI 🇻🇦 683 121 6ms 9 May 2024 414th emgordon154 683 121 8ms 6 Dec 2024 416th CLOStrophobic 🇮🇹 683 145 5ms 1 Mar 2025 417th JRaspass 🇬🇧 682 104 3ms 10 Jun 2022 417th nephila-nacrea 🇬🇧 682 104 3ms 10 Jun 2022 419th dokutan 682 139 145ms 28 Mar 2024 420th DialFrost 🇸🇬 680 130 4ms 17 Nov 2023 421st AlephSquirrel 680 135 4ms 22 Apr 2023 422nd HumanoidCPU 679 359 10ms 21 May 2024 423rd GrayJoKing 🇦🇺 678 101 72ms 9 Dec 2023 424th MeWhenI 🇻🇦 677 79 31ms 16 Aug 2022 425th Yewzir 🇧🇪 677 122 6ms 18 Dec 2023 426th MeWhenI 🇻🇦 677 175 3ms 24 Jul 2023 427th lynn 676 93 9ms 27 Jan 2022 427th prplz 🇦🇺 676 93 9ms 25 May 2022 427th Seek64 🇩🇪 676 93 10ms 30 Sep 2023 427th blaztoma 🇱🇹 676 93 9ms 26 days ago 431st Shanethegamer 🇺🇸 674 116 85ms 15 Jan 2023 432nd stefangimmillaro 674 151 446ms 11 Nov 2024 433rd ovs-code 🇩🇪 673 90 470ms 11 Mar 2024 434th edsrzf 🇳🇿 672 123 8ms 69 mins ago 435th MeWhenI 🇻🇦 670 192 274ms 9 Feb 2023 436th DialFrost 🇸🇬 669 94 10ms 2 Oct 2023 436th davecame 669 94 9ms 30 Sep 2024 438th AlephSquirrel 669 148 5ms 17 Mar 2023 439th Natanaelel 🇸🇪 668 148 127ms 16 Jun 2025 440th Yewzir 🇧🇪 668 160 133ms 4 Feb 2024 441st dokutan 665 367 10ms 31 Oct 2023 441st CaedenHarper 🇨🇦 665 367 10ms 24 Jan 2025 443rd PixelSoftwareStudios 🇺🇸 662 95 11ms 11 Jun 2024 443rd edsrzf 🇳🇿 662 95 42ms 10 hours ago 445th DialFrost 🇸🇬 660 169 124ms 25 Dec 2023 446th dokutan 660 195 301ms 1 Apr 2024 447th Yewzir 🇧🇪 659 115 1,070ms 15 Nov 2025 448th tayloia 🇬🇧 659 123 9ms 2 May 2023 448th targrik 659 123 9ms 9 Jun 2025 450th yzhs 🇩🇪 659 150 114ms 26 Jun 2023 451st HumanoidCPU 659 182 3ms 20 Nov 2025 452nd Alessandro-Balconi 🇮🇹 658 90 89ms 15 Jul 2023 452nd DialFrost 🇸🇬 658 90 87ms 18 Mar 2025 454th jared-hughes 658 128 2ms 17 Jul 2022 455th emgordon154 658 169 76ms 8 Feb 2026 456th plcc0 657 119 80ms 19 hours ago 457th Jasper-Ty 🇵🇭 657 136 1ms 27 Apr 2024 458th dokutan 657 167 2ms 13 Apr 2024 459th emgordon154 657 196 297ms 17 Jan 2025 460th madex 🇩🇪 656 113 5ms 7 hours ago 461st dokutan 656 165 1ms 1 Apr 2024 462nd stefangimmillaro 655 169 102ms 31 Aug 2023 463rd Yewzir 🇧🇪 654 145 151ms 22 Dec 2024 464th DialFrost 🇸🇬 653 150 2ms 15 Apr 2025 465th sean-niemann 🇺🇸 652 112 2ms 19 Nov 2023 466th stefangimmillaro 651 169 133ms 13 Nov 2023 467th pschmid0 🇺🇸 650 136 4ms 23 Oct 2022 468th BlankSpruce 650 171 59ms 9 Jan 2026 469th namelessiw 648 97 10ms 10 Apr 2024 470th error256 648 138 2ms 24 Dec 2024 471st blaztoma 🇱🇹 647 205 42ms 27 Dec 2025 472nd Yewzir 🇧🇪 646 113 1ms 21 Dec 2023 473rd snoozingnewt 🇨🇦 646 137 5ms 16 Sep 2025 474th nwellnhof 🇩🇪 645 83 33ms 5 Oct 2022 474th tatzyr 🇯🇵 645 83 38ms 15 Feb 2025 476th duckyluuk 🇳🇱 644 186 9ms 18 Dec 2024 477th madex 🇩🇪 643 139 1ms 18 Mar 2022 478th m-tkach 🇺🇦 640 153 2ms 27 Oct 2022 479th HumanoidCPU 639 174 74ms 29 Aug 2024 480th stefangimmillaro 638 127 9ms 27 Sep 2024 First Prev 401–480 of 1,808 Next Last