The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 hours. Why not try and solve them ahead of time?
Zodiac Signs in all languages in bytes. 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 Bytes Time Submitted 481st shinh 562 171 36ms 26 Jun 2022 482nd commandz0 🇺🇸 561 207 604ms 1 Sep 2025 483rd janbehrens 🇩🇪 557 233 7ms 8 Jun 2023 484th Shanethegamer 🇺🇸 553 145 160ms 1 Jul 2022 485th amollberg 🇸🇪 552 240 24ms 10 Jan 2024 486th h3ra993huskp 🇯🇵 551 309 468ms 30 Nov 2025 487th quimey 550 241 14ms 13 Jul 2023 488th MeWhenI 🇻🇦 550 275 32ms 6 Jun 2023 489th Bonjour27891 🇻🇳 548 242 14ms 15 Jul 2022 489th neel11235813 548 242 14ms 16 Mar 2024 491st MeWhenI 🇻🇦 547 117 3ms 13 Jun 2022 492nd MeWhenI 🇻🇦 544 138 4ms 16 Apr 2023 493rd cros107 🇦🇺 539 246 14ms 12 Nov 2025 494th CaedenHarper 🇨🇦 538 223 10ms 29 Aug 2025 495th abt8601 🇹🇼 537 287 169ms 15 Jul 2022 496th UnderKoen 🇳🇱 536 222 15ms 10 Jun 2022 497th AlexanderFair 534 248 12ms 20 Jul 2023 498th wh3n3v3r 🇨🇿 532 249 13ms 14 Nov 2024 499th snoozingnewt 🇨🇦 532 320 532ms 8 Nov 2025 500th CaedenHarper 🇨🇦 531 204 1,528ms 30 Sep 2025 501st arctouch-cristiannevianna 531 267 417ms 27 Feb 2024 502nd Babafaba 526 252 13ms 4 Nov 2025 503rd MeWhenI 🇻🇦 525 265 150ms 13 Jun 2022 504th albanian-laundromat 523 259 135ms 1 Dec 2025 505th jotslo 🇬🇧 517 238 2ms 17 Jul 2022 506th Xzyaihni 513 367 209ms 19 Jan 2024 507th tomh1012 512 385 5ms 13 Feb 2026 508th jhpaques 🇫🇷 508 261 19ms 29 Jul 2022 509th jacobly0 🇺🇸 507 419 1,805ms 22 Apr 2024 510th postie77 505 281 431ms 28 Jun 2024 511th dokutan 503 302 13ms 21 Jun 2024 512th tomh1012 501 283 415ms 17 Nov 2025 513th olleicua 🇺🇸 500 150 5ms 9 Nov 2025 514th MaxElf999 500 265 12ms 23 Sep 2022 514th TaserTheFox 🇺🇸 500 265 106ms 16 Mar 2023 514th codingisgreatbutiamnot 500 265 13ms 11 Jun 2025 517th neel11235813 498 233 534ms 16 Mar 2024 518th BREMAUCY 🇫🇷 498 396 3ms 8 Nov 2025 519th Chinay-Domitrix 🇺🇸 496 242 2,579ms 14 days ago 520th ericlangedijk 🇸🇮 496 286 437ms 21 May 2023 521st jtaxen 493 269 15ms 23 Apr 2024 522nd mbittner20 491 270 12ms 27 May 2023 523rd TheZwierzLF 🇵🇱 490 196 38ms 25 Dec 2025 524th MeWhenI 🇻🇦 488 242 7ms 1 Oct 2022 525th roguh 🇬🇹 487 272 12ms 22 Feb 2024 526th madex 🇩🇪 486 165 171ms 14 days ago 527th tobeannouncd 483 319 163ms 25 Apr 2025 528th Babafaba 476 244 620ms 4 Nov 2025 529th yzhs 🇩🇪 475 279 21ms 23 Jun 2023 529th tomh1012 475 279 14ms 12 Feb 2026 531st BREMAUCY 🇫🇷 473 359 149ms 8 Nov 2025 532nd jerrandolph 471 354 293ms 23 Dec 2023 533rd MeWhenI 🇻🇦 469 489 25ms 1 Dec 2023 534th retrohun 468 186 3ms 10 Nov 2025 535th msbranicky 467 284 18ms 19 Aug 2023 536th MeWhenI 🇻🇦 466 276 25ms 13 Jun 2022 537th FortuiteMan 🇫🇷 465 276 15ms 19 Oct 2025 538th p-vf 🇨🇭 463 306 401ms 9 Jul 2022 538th KatieLG 🇬🇧 463 306 440ms 24 Oct 2022 540th MeWhenI 🇻🇦 459 268 2ms 31 Dec 2022 541st KatieLG 🇬🇧 459 363 299ms 11 Jan 2023 542nd yuchuehw 458 289 21ms 2 Feb 2024 543rd JRaspass 🇬🇧 457 164 6ms 3 Jul 2023 544th billings7 🇬🇧 457 310 402ms 16 Jul 2022 545th MeWhenI 🇻🇦 457 371 38ms 12 Jun 2022 546th alemelis 455 291 20ms 13 Sep 2024 547th null-tangent 449 267 11ms 1 Aug 2022 548th za3k 448 296 37ms 8 Oct 2022 549th bac0id 447 280 3ms 4 Jul 2024 550th bac0id 445 319 433ms 4 Jul 2024 551st madex 🇩🇪 444 341 32ms 14 days ago 552nd msbranicky 440 448 4ms 12 Aug 2023 553rd retrohun 439 171 3ms 11 Nov 2025 554th bac0id 434 327 412ms 4 Jul 2024 555th Florian-Mt 424 283 11ms 20 Dec 2025 556th Yax42 🇫🇷 423 296 3ms 9 Jan 2026 557th CatsAreFluffy 421 315 12ms 11 Jan 2023 558th msbranicky 413 403 287ms 31 Aug 2023 559th msbranicky 409 284 656ms 16 Jan 2024 560th dokutan 409 293 9ms 14 Jan 2026 First Prev 481–560 of 671 Next Last