The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 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 719th Lv0Sys 🇵🇱 466 135 14ms 27 Feb 2026 722nd violeta-desantis 466 192 1ms 27 Apr 2024 723rd dokutan 466 217 38ms 4 Oct 2024 724th jerrandolph 465 277 280ms 20 Oct 2023 725th razetime 464 65 2ms 26 Jan 2022 725th Shanethegamer 🇺🇸 464 65 2ms 20 May 2022 725th bwenstar 464 65 2ms 11 Aug 2022 725th trist224 🇫🇷 464 65 2ms 28 Nov 2022 725th rucin93 🇵🇱 464 65 2ms 3 May 2023 725th snoozingnewt 🇨🇦 464 65 2ms 7 Sep 2023 725th neel11235813 464 65 2ms 20 Nov 2023 725th FortuiteMan 🇫🇷 464 65 2ms 10 Oct 2024 725th LostSyntax21 🇬🇧 464 65 2ms 19 Jan 2025 725th CornerMercury 🇬🇧 464 65 2ms 28 Jan 2026 735th quimey 462 136 11ms 12 Jun 2023 735th cingulataluke 462 136 9ms 26 Aug 2023 737th msbranicky 462 212 2ms 3 Oct 2023 738th Shanethegamer 🇺🇸 462 341 1,433ms 13 Jan 2025 738th KatieLG 🇬🇧 462 341 1,449ms 13 Jan 2025 738th HumanoidCPU 462 341 1,419ms 13 Jan 2025 738th dokutan 462 341 1,418ms 13 Jan 2025 738th CaedenHarper 🇨🇦 462 341 1,411ms 25 Jan 2025 738th MeWhenI 🇻🇦 462 341 1,445ms 10 Feb 2025 744th shinh 461 116 34ms 25 Jun 2022 745th dokutan 461 186 2ms 1 Apr 2024 746th bac0id 461 241 69ms 23 Feb 2024 747th Shanethegamer 🇺🇸 460 50 32ms 25 Jan 2022 747th scpchicken 🇵🇼 460 50 33ms 13 Mar 2022 747th yzhs 🇩🇪 460 50 32ms 6 Jun 2022 747th neel11235813 460 50 33ms 12 Feb 2023 751st GolfingSuccess 🇬🇷 460 161 4ms 16 Aug 2024 752nd HumanoidCPU 460 170 69ms 28 Apr 2024 753rd thisishowmymindworks 🇳🇴 460 176 10ms 2 Jul 2024 754th KatieLG 🇬🇧 460 327 7ms 12 Mar 2023 754th msbranicky 460 327 6ms 15 Sep 2023 756th retrohun 458 184 20ms 30 Jan 2022 757th JunkIce 456 138 17ms 23 Jan 2025 757th dokutan 456 138 17ms 27 Dec 2025 759th frankgraziano 454 203 6ms 8 Feb 2026 760th hamhub7 450 226 374ms 12 Aug 2022 761st CatsAreFluffy 450 247 86ms 12 Feb 2023 762nd SniperSmiley 🇺🇸 449 140 12ms 29 Aug 2023 763rd MeWhenI 🇻🇦 449 158 3ms 16 Apr 2023 764th dokutan 449 245 124ms 6 Nov 2024 765th Bonjour27891 🇻🇳 446 141 21ms 15 Jul 2022 766th Shanethegamer 🇺🇸 446 307 4ms 7 Feb 2026 766th CaedenHarper 🇨🇦 446 307 2ms 10 days ago 768th HumanoidCPU 445 308 2ms 1 Jan 2026 768th KatieLG 🇬🇧 445 308 2ms 21 Feb 2026 770th TobyBoyne 🇬🇧 443 142 9ms 29 Jan 2022 770th Grrisly 443 142 17ms 25 Mar 2024 770th CutSandstone 443 142 10ms 5 Jul 2024 773rd dokutan 442 137 403ms 14 Feb 2026 774th DaCuteRaccoon 441 256 464ms 15 May 2022 775th MeWhenI 🇻🇦 440 90 38ms 24 Aug 2022 776th Andrey-Plotnikov 440 184 9ms 27 Sep 2025 776th snoozingnewt 🇨🇦 440 184 12ms 5 Oct 2025 778th JunkIce 439 138 433ms 23 Jan 2025 779th Msleizak 🇫🇷 439 555 11ms 4 Nov 2022 780th HumanoidCPU 438 185 12ms 26 Apr 2024 781st PickausernamePi 437 144 10ms 23 Dec 2022 781st Just4FunCoder 437 144 10ms 24 Sep 2025 783rd taind772 437 252 182ms 27 Jan 2022 784th olleicua 🇺🇸 436 186 10ms 2 Feb 2024 785th madex 🇩🇪 433 234 40ms 11 hours ago 786th nstearns96 🇬🇧 431 146 9ms 15 Jul 2024 786th Pyroan 431 146 10ms 20 Mar 2025 788th MeWhenI 🇻🇦 431 176 1,099ms 15 Sep 2025 789th tri1212 🇻🇳 428 147 19ms 5 Jul 2024 790th JRaspass 🇬🇧 427 311 37ms 13 Jun 2022 790th MeWhenI 🇻🇦 427 311 36ms 14 Jun 2022 790th CaedenHarper 🇨🇦 427 311 34ms 22 Jan 2025 793rd jhpaques 🇫🇷 425 148 10ms 30 Jul 2022 794th dokutan 425 207 38ms 29 Oct 2024 795th KatieLG-Transpiler 🇬🇧 425 312 35ms 23 Jun 2022 795th KatieLG 🇬🇧 425 312 36ms 30 Sep 2024 797th dokutan 424 144 253ms 9 Apr 2024 798th eranws 424 191 8ms 2 Sep 2023 799th BlankSpruce 422 149 10ms 15 Aug 2024 800th dokutan 422 192 10ms 27 Apr 2025 First Prev 721–800 of 1,804 Next Last