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?
Set 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 401st IISResetMe 557 177 4,141ms 26 Mar 2025 402nd didion0 🇺🇸 551 181 22ms 30 May 2025 403rd MeWhenI 🇻🇦 549 240 527ms 5 Apr 2025 404th HumanoidCPU 546 205 37ms 29 Mar 2025 404th undefinedRyan 546 205 53ms 19 Apr 2025 404th asherdiamond 546 205 19ms 13 Aug 2025 407th snoozingnewt 🇨🇦 543 209 128ms 7 Dec 2025 408th CaedenHarper 🇨🇦 542 184 19ms 30 Aug 2025 409th Jacob385 541 297 436ms 31 Mar 2025 410th Chinay-Domitrix 🇺🇸 540 188 2,754ms 28 Mar 2025 411th Ripick 539 237 400ms 24 Apr 2025 412th JDiLenarda 🇫🇷 537 264 1,406ms 7 Apr 2025 413th helbling 🇨🇭 533 187 12ms 26 Mar 2025 414th Protothor 525 190 17ms 26 Jul 2025 415th annaproxy 521 221 424ms 2 Apr 2025 415th tomh1012 521 221 506ms 26 Aug 2025 417th snoozingnewt 🇨🇦 518 286 64ms 30 Oct 2025 418th mousetail 🇳🇱 513 247 2ms 28 Mar 2025 419th snoozingnewt 🇨🇦 511 248 119ms 30 Oct 2025 420th FEZfan 🇦🇺 510 250 38ms 22 Apr 2025 421st HumanoidCPU 507 190 618ms 29 Mar 2025 422nd snoozingnewt 🇨🇦 505 253 456ms 30 Oct 2025 423rd mbittner20 498 225 15ms 1 Apr 2025 424th YAJUE114514 483 232 21ms 1 Jul 2025 425th gigaprofisi 🇺🇸 481 207 41ms 7 Aug 2025 426th brimstonetrader 481 233 35ms 1 Apr 2025 427th snoozingnewt 🇨🇦 479 208 13ms 30 Oct 2025 428th targrik 474 206 543ms 4 Jul 2025 429th MeWhenI 🇻🇦 470 245 392ms 5 Apr 2025 430th razdiamond 467 240 19ms 5 Aug 2025 431st Apataras 467 344 417ms 23 Jul 2025 432nd acollett89 461 216 11ms 5 Aug 2025 433rd CaedenHarper 🇨🇦 453 254 405ms 17 Oct 2025 434th snoozingnewt 🇨🇦 451 345 253ms 30 Oct 2025 435th Vaekor 450 249 16ms 5 Apr 2025 436th snoozingnewt 🇨🇦 447 314 35ms 30 Oct 2025 437th ericlangedijk 🇸🇮 446 258 450ms 3 Apr 2025 438th snoozingnewt 🇨🇦 440 365 520ms 30 Oct 2025 439th snoozingnewt 🇨🇦 436 193 24ms 30 Oct 2025 440th yoshykai 433 371 462ms 10 Apr 2025 441st Robvdhout 430 232 13ms 10 Apr 2025 442nd snoozingnewt 🇨🇦 424 271 467ms 30 Oct 2025 443rd Yewzir 🇧🇪 419 267 19ms 17 Nov 2025 444th snoozingnewt 🇨🇦 409 239 13ms 30 Oct 2025 445th zakariamouhid 408 244 15ms 17 Jun 2025 446th BREMAUCY 🇫🇷 408 311 130ms 16 Apr 2025 447th iczelia 🇩🇪 404 247 16ms 25 Oct 2025 448th snoozingnewt 🇨🇦 402 304 639ms 30 Oct 2025 449th kasarino 394 292 468ms 27 Feb 2026 450th JOrE20 385 259 11ms 13 Feb 2026 451st MeWhenI 🇻🇦 378 219 1,830ms 15 Sep 2025 452nd snoozingnewt 🇨🇦 371 415 51ms 30 Oct 2025 453rd MeWhenI 🇻🇦 370 283 3,135ms 19 Jun 2025 454th WillowWispy 367 305 57ms 28 Mar 2025 455th snoozingnewt 🇨🇦 363 556 30ms 30 Oct 2025 456th KatieLG 🇬🇧 351 738 476ms 26 days ago 457th snoozingnewt 🇨🇦 345 193 26ms 30 Oct 2025 458th snoozingnewt 🇨🇦 345 368 3ms 30 Oct 2025 459th Zhenyu-Bo 336 333 15ms 1 Aug 2025 460th snoozingnewt 🇨🇦 319 417 75ms 30 Oct 2025 461st snoozingnewt 🇨🇦 313 385 45ms 30 Oct 2025 462nd DitherDude 310 371 450ms 9 Apr 2025 463rd Msleizak 🇫🇷 277 356 1,866ms 19 May 2025 464th ravnskjaer 🇩🇰 274 587 474ms 15 Dec 2025 465th mwessler 266 250 17ms 28 Mar 2025 466th dokutan 261 257 80ms 1 Apr 2025 467th FortuiteMan 🇫🇷 248 2,608 4,262ms 8 Aug 2025 468th jb567 237 472 38ms 13 Apr 2025 469th JOrE20 224 900 58ms 20 Feb 2026 470th AidanWalter 194 576 13ms 28 Nov 2025 471st kg583 🇺🇸 0 16 2,407ms 11 Apr 2025 472nd saito-ta 🇯🇵 0 22 102ms 8 Jul 2025 473rd darrenks 🇺🇸 0 25 93ms 7 Jul 2025 474th GolfingSuccess 🇬🇷 0 28 317ms 13 Aug 2025 474th aditsu 0 28 173ms 21 Sep 2025 474th namelessiw 0 28 813ms 26 Nov 2025 477th plcc0 0 33 168ms 9 May 2025 477th 2bular 0 33 66ms 9 May 2025 479th Natanaelel 🇸🇪 0 50 65ms 7 Apr 2025 480th ovs-code 🇩🇪 0 65 532ms 24 Jan 2026 First Prev 401–480 of 491 Next Last