The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Zodiac Signs 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 CaedenHarper 🇨🇦 572 240 408ms 17 Oct 2025 402nd two-bad 🇬🇧 570 173 11ms 25 Feb 2024 403rd abt8601 🇹🇼 570 263 169ms 15 Jul 2022 404th MeWhenI 🇻🇦 569 203 2,498ms 27 Oct 2024 405th MeWhenI 🇻🇦 567 197 200ms 18 Nov 2023 406th Babafaba 566 147 396ms 4 Nov 2025 407th janbehrens 🇩🇪 565 294 487ms 12 Sep 2022 408th snoozingnewt 🇨🇦 565 341 28ms 21 Nov 2025 409th rucin93 🇵🇱 564 150 155ms 3 Aug 2024 410th acollett89 563 175 12ms 4 Aug 2025 411th Shanethegamer 🇺🇸 561 146 309ms 24 Feb 2023 412th OllieBoyne 🇬🇧 561 161 19ms 10 Jun 2022 412th roguh 🇬🇹 561 161 12ms 22 Feb 2024 414th CaedenHarper 🇨🇦 561 302 3ms 7 Nov 2025 415th MeWhenI 🇻🇦 560 165 1,023ms 15 Sep 2025 416th MeWhenI 🇻🇦 559 258 1,435ms 13 Jun 2022 417th Irratix 🇳🇱 558 162 18ms 2 Jul 2022 418th olleicua 🇺🇸 557 304 3ms 8 Nov 2025 419th MeWhenI 🇻🇦 555 330 170ms 13 Jun 2022 420th MeWhenI 🇻🇦 554 209 9ms 19 Jul 2022 421st jared-hughes 551 131 40ms 19 Sep 2022 422nd UnderKoen 🇳🇱 551 210 15ms 10 Jun 2022 423rd coreynash 547 180 18ms 14 Mar 2024 424th janbehrens 🇩🇪 545 233 7ms 8 Jun 2023 425th MichalMarsalek 🇨🇿 544 166 11ms 14 Jan 2023 425th fgrosshans 🇫🇷 544 166 11ms 12 Jul 2024 425th madex 🇩🇪 544 166 12ms 9 days ago 428th MeWhenI 🇻🇦 544 192 100ms 12 Dec 2022 429th Natanaelel 🇸🇪 541 167 12ms 11 Jun 2022 429th martinnorling 🇸🇪 541 167 11ms 16 Jun 2022 429th suhasdara 541 167 12ms 16 Aug 2022 429th yzhs 🇩🇪 541 167 22ms 23 Jun 2023 429th croc54 541 167 13ms 7 Jan 2025 434th scpchicken 🇵🇼 541 182 12ms 14 Jan 2023 434th weliveinhell 🇭🇹 541 182 11ms 4 Dec 2023 436th Mabeloid 🇳🇴 540 154 487ms 6 Oct 2024 437th edsrzf 🇳🇿 540 198 14ms 20 Feb 2025 438th MeWhenI 🇻🇦 540 275 32ms 6 Jun 2023 439th guilhem-roy 🇫🇷 538 168 11ms 29 Jun 2022 439th YAJUE114514 538 168 12ms 3 Aug 2025 441st postie77 538 255 431ms 28 Jun 2024 442nd h3ra993huskp 🇯🇵 538 309 468ms 30 Nov 2025 443rd C0de5mith 🇺🇸 536 184 14ms 7 Aug 2022 444th Natanaelel 🇸🇪 535 106 156ms 11 Jun 2022 445th twocatsinatrenchcoat 535 169 12ms 15 Jun 2022 446th Xzyaihni 534 343 209ms 19 Jan 2024 447th alexsave 530 186 15ms 5 Jan 2026 448th MeWhenI 🇻🇦 530 208 111ms 6 Nov 2023 449th yuchuehw 528 171 21ms 2 Feb 2024 449th StefanHabel 🇨🇦 528 171 12ms 18 days ago 451st MichaelMBradley 🇨🇦 525 172 12ms 11 Jun 2022 452nd BREMAUCY 🇫🇷 524 324 162ms 8 Nov 2025 453rd MeWhenI 🇻🇦 523 117 3ms 13 Jun 2022 454th retrohun 520 162 3ms 10 Nov 2025 455th TobyBoyne 🇬🇧 519 174 12ms 19 Jul 2022 456th snoozingnewt 🇨🇦 519 320 532ms 8 Nov 2025 457th jacekwladzinski 516 175 11ms 7 Oct 2025 458th jotslo 🇬🇧 515 214 2ms 17 Jul 2022 459th albanian-laundromat 514 254 135ms 1 Dec 2025 460th arctouch-cristiannevianna 514 267 417ms 27 Feb 2024 461st didion0 🇺🇸 513 192 15ms 10 Jun 2022 462nd jacobly0 🇺🇸 512 395 1,805ms 22 Apr 2024 463rd galloj 🇨🇿 510 177 11ms 2 Sep 2022 464th retrohun 508 178 11ms 11 Nov 2025 465th Troon 505 179 15ms 12 Mar 2025 466th MeWhenI 🇻🇦 503 147 275ms 15 Feb 2023 467th MeWhenI 🇻🇦 503 168 156ms 3 Aug 2024 468th BREMAUCY 🇫🇷 502 180 14ms 21 Aug 2025 469th scpchicken 🇵🇼 500 104 6ms 14 Jan 2023 470th janbehrens 🇩🇪 500 197 15ms 24 Jun 2022 471st MeWhenI 🇻🇦 500 286 46ms 4 Sep 2024 472nd neihousaigaai 496 182 12ms 9 Jun 2022 473rd jerrandolph 495 328 293ms 23 Dec 2023 474th shinh 491 147 36ms 26 Jun 2022 475th AlephSquirrel 490 225 65ms 1 Dec 2025 476th FortuiteMan 🇫🇷 486 186 13ms 15 Oct 2025 477th tomh1012 485 283 415ms 17 Nov 2025 478th CaedenHarper 🇨🇦 483 187 17ms 15 Aug 2025 479th dokutan 483 296 43ms 27 Aug 2024 480th billings7 🇬🇧 480 286 402ms 16 Jul 2022 First Prev 401–480 of 665 Next Last