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 801st eranws 424 191 8ms 2 Sep 2023 802nd BlankSpruce 422 149 10ms 15 Aug 2024 803rd dokutan 422 192 10ms 27 Apr 2025 804th Msleizak 🇫🇷 422 357 6ms 26 Apr 2023 805th h3ra993huskp 🇯🇵 421 276 467ms 30 Nov 2025 806th guilhem-roy 🇫🇷 419 150 10ms 22 Feb 2022 807th prplz 🇦🇺 418 55 33ms 26 Jan 2022 808th blaztoma 🇱🇹 418 128 36ms 15 Oct 2025 809th error256 418 187 77ms 13 hours ago 810th KingSkyrock 🇺🇸 418 194 9ms 6 Nov 2022 811th bac0id 418 214 1ms 22 Sep 2023 812th MeWhenI 🇻🇦 416 206 2ms 11 Oct 2023 813th jgbaldwinbrown 416 215 1ms 29 Jun 2022 814th HumanoidCPU 416 319 37ms 9 Mar 2025 815th dokutan 415 165 780ms 10 Dec 2025 816th ravnskjaer 🇩🇰 415 280 444ms 15 Dec 2025 817th CedricGebistorf 408 154 9ms 3 Mar 2022 817th sleepyStick 408 154 16ms 14 Mar 2022 819th codewrite 🇬🇧 407 250 416ms 18 Jan 2026 820th iczelia 🇩🇪 405 244 123ms 19 Oct 2025 821st yoshykai 405 287 473ms 8 Apr 2025 821st Schmitt-Very-Cool 405 287 514ms 3 Oct 2025 823rd mrmena 🇦🇺 405 328 37ms 28 Mar 2024 824th matejmatik123 🇸🇰 404 275 1,371ms 1 Oct 2025 825th bwat2 404 288 424ms 8 Mar 2022 826th b10011 🇫🇮 403 156 9ms 11 Jan 2023 826th TaserTheFox 🇺🇸 403 156 15ms 1 May 2023 828th dokutan 403 280 441ms 27 Dec 2025 829th Waffle3z 403 310 1ms 12 May 2022 829th DaCuteRaccoon 403 310 1ms 15 May 2022 829th KatieLG 🇬🇧 403 310 1ms 22 May 2022 829th KatieLG-Transpiler 🇬🇧 403 310 1ms 24 Jun 2022 829th HumanoidCPU 403 310 1ms 21 May 2024 829th CaedenHarper 🇨🇦 403 310 1ms 16 Aug 2025 829th snoozingnewt 🇨🇦 403 310 1ms 9 Oct 2025 836th retrohun 403 329 36ms 28 Dec 2022 836th msbranicky 403 329 36ms 21 Sep 2023 838th denkyuu1 402 133 37ms 25 Feb 2026 839th edsrzf 🇳🇿 402 220 5ms 30 Oct 2024 840th neihousaigaai 401 157 10ms 17 Apr 2022 841st blaztoma 🇱🇹 401 195 76ms 23 hours ago 842nd Mabeloid 🇳🇴 401 311 1ms 4 Oct 2024 843rd msbranicky 399 313 1ms 20 Sep 2023 844th MeWhenI 🇻🇦 397 154 254ms 15 Feb 2023 845th HumanoidCPU 397 191 825ms 27 Dec 2025 846th Shanethegamer 🇺🇸 396 173 69ms 16 Dec 2024 847th crizin 🇰🇷 394 295 451ms 9 Sep 2023 848th olleicua 🇺🇸 393 136 35ms 15 Feb 2024 849th HumanoidCPU 393 305 3ms 12 Dec 2024 849th dokutan 393 305 3ms 12 Dec 2024 849th KatieLG 🇬🇧 393 305 3ms 3 Jan 2025 849th Shanethegamer 🇺🇸 393 305 3ms 13 Jan 2025 849th BREMAUCY 🇫🇷 393 305 4ms 14 Jan 2025 849th CaedenHarper 🇨🇦 393 305 3ms 16 Aug 2025 855th KatieLG 🇬🇧 392 464 1,722ms 13 Sep 2025 856th celiendonze 🇨🇭 391 161 9ms 16 Jun 2023 857th LukeBridges 🇬🇧 391 207 9ms 27 Oct 2022 858th KatieLG 🇬🇧 391 306 2ms 24 Sep 2022 858th JRaspass 🇬🇧 391 306 2ms 24 Sep 2022 858th KatieLG-Transpiler 🇬🇧 391 306 3ms 26 Sep 2022 858th retrohun 391 306 3ms 28 Dec 2022 858th Shanethegamer 🇺🇸 391 306 2ms 1 Mar 2023 858th Mabeloid 🇳🇴 391 306 2ms 4 Oct 2024 858th ehulinsky 🇺🇸 391 306 3ms 29 Mar 2025 858th CaedenHarper 🇨🇦 391 306 2ms 16 Aug 2025 866th MeWhenI 🇻🇦 391 345 25ms 25 Jan 2022 866th KatieLG 🇬🇧 391 345 25ms 23 Mar 2024 866th CaedenHarper 🇨🇦 391 345 24ms 16 Aug 2025 866th JOrE20 391 345 28ms 14 Feb 2026 870th alphafalfa 390 187 2ms 26 Nov 2024 871st emgordon154 390 261 422ms 14 days ago 872nd olleicua 🇺🇸 390 307 4ms 9 Nov 2025 873rd KatieLG-Transpiler 🇬🇧 390 346 24ms 24 Jun 2022 874th msbranicky 389 278 1ms 28 Sep 2023 875th nemoyatpeace 388 162 10ms 16 Jan 2026 876th juliansiebert 🇩🇪 387 186 298ms 4 Aug 2022 877th MattShaile 386 210 9ms 26 Apr 2022 878th CatsAreFluffy 384 233 2ms 12 Feb 2023 879th DaCuteRaccoon 384 335 289ms 15 May 2022 880th georgehulme 383 164 16ms 28 Jan 2022 First Prev 801–880 of 1,806 Next Last
