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?
Musical Chords 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 321st MeWhenI 🇻🇦 414 658 28ms 17 Mar 2022 322nd Sp3000 🇦🇺 413 194 12ms 20 Nov 2021 323rd annaproxy 410 335 171ms 4 Sep 2022 324th emgordon154 408 318 12ms 7 days ago 325th KatieLG 🇬🇧 406 162 34ms 3 Oct 2025 326th RaBa21 🇭🇺 405 198 19ms 1 Aug 2025 327th helbling 🇨🇭 401 239 11ms 21 Oct 2024 328th DialFrost 🇸🇬 399 178 614ms 23 May 2024 329th MeWhenI 🇻🇦 399 265 419ms 21 Nov 2021 330th adamnielson42 🇺🇸 397 202 12ms 25 Apr 2023 331st Waffle3z 396 166 40ms 9 Nov 2021 332nd vishwathg 393 204 62ms 27 Sep 2022 333rd roguh 🇬🇹 392 189 534ms 18 Oct 2024 334th JOrE20 389 246 11ms 20 Feb 2026 335th MeWhenI 🇻🇦 386 203 306ms 28 Jan 2023 336th ahmetdemirag 🇨🇾 385 208 12ms 25 Nov 2024 337th coreynash 382 251 11ms 20 Nov 2023 338th MeWhenI 🇻🇦 381 186 399ms 15 Feb 2023 339th snoozingnewt 🇨🇦 379 253 15ms 4 Nov 2025 340th quirked-up 373 257 11ms 31 Aug 2023 341st MeWhenI 🇻🇦 372 366 1,373ms 4 Nov 2021 342nd uttumuttu 🇫🇮 370 259 13ms 9 Jan 2022 343rd CatsAreFluffy 366 324 2ms 4 Feb 2023 344th lynn 361 329 2ms 8 Feb 2022 345th InigoK 🇺🇸 359 223 28ms 23 Sep 2025 346th stefangimmillaro 359 359 5ms 2 Jul 2023 347th RYNO8 358 224 19ms 10 Nov 2021 348th janbehrens 🇩🇪 355 226 12ms 17 Jun 2023 349th janbehrens 🇩🇪 355 402 506ms 14 Nov 2021 350th blaztoma 🇱🇹 350 189 5ms 2 days ago 351st janbehrens 🇩🇪 350 302 434ms 21 Nov 2021 352nd KatieLG 🇬🇧 348 783 12ms 19 May 2024 353rd madex 🇩🇪 347 350 532ms 12 days ago 354th janbehrens 🇩🇪 346 205 527ms 14 Nov 2021 355th ShiraJoseph 🇺🇸 342 280 11ms 21 Jul 2023 356th MeWhenI 🇻🇦 342 313 30ms 21 Jun 2022 357th madex 🇩🇪 342 398 1,303ms 12 days ago 358th wh3n3v3r 🇨🇿 341 235 15ms 14 Nov 2024 359th snoozingnewt 🇨🇦 339 373 304ms 10 Feb 2026 360th Pyroan 338 237 19ms 15 Mar 2025 361st roguh 🇬🇹 337 314 445ms 18 Oct 2024 362nd StefanHabel 🇨🇦 334 240 17ms 25 days ago 363rd DialFrost 🇸🇬 333 241 19ms 20 May 2024 364th TFeld00 🇩🇰 330 243 161ms 3 Oct 2022 365th DialFrost 🇸🇬 328 226 626ms 24 May 2024 366th MeWhenI 🇻🇦 325 296 315ms 12 Nov 2022 367th ericlangedijk 🇸🇮 322 328 456ms 20 Mar 2022 368th FlorianCassayre 🇫🇷 319 251 13ms 5 Aug 2025 369th msbranicky 319 584 292ms 7 Sep 2023 370th prplz 🇦🇺 318 252 18ms 22 Oct 2023 370th davecame 318 252 13ms 15 Oct 2025 370th Babafaba 318 252 20ms 29 Oct 2025 373rd janbehrens 🇩🇪 314 477 2,937ms 20 Nov 2022 374th MichalMarsalek 🇨🇿 312 257 13ms 5 Nov 2021 374th robin-scragg 312 257 12ms 3 Oct 2025 374th FortuiteMan 🇫🇷 312 257 19ms 1 Dec 2025 377th heanyang1 310 383 2ms 28 May 2025 378th commandz0 🇺🇸 307 241 644ms 1 Sep 2025 379th jakobkordez 🇸🇮 304 264 18ms 8 Nov 2022 380th heanyang1 302 451 1,477ms 23 May 2025 381st BambooleanLogic 🇸🇪 300 319 10ms 13 Jul 2023 382nd dokutan 299 268 19ms 26 Dec 2025 383rd janbehrens 🇩🇪 298 458 877ms 14 Nov 2021 384th Mabeloid 🇳🇴 297 270 12ms 10 Jun 2025 385th janbehrens 🇩🇪 296 223 4ms 14 Nov 2021 386th Babafaba 294 252 412ms 29 Oct 2025 387th MeWhenI 🇻🇦 294 269 178ms 3 Aug 2024 388th annaproxy 294 360 435ms 25 Apr 2022 389th neel11235813 294 413 457ms 1 Apr 2024 389th snoozingnewt 🇨🇦 294 413 470ms 29 Sep 2025 391st madex 🇩🇪 293 361 433ms 12 days ago 392nd jerrandolph 291 641 299ms 1 Oct 2025 393rd JOrE20 289 277 13ms 4 Dec 2025 394th MeWhenI 🇻🇦 289 299 1,190ms 15 Sep 2025 395th yuchuehw 287 279 19ms 23 Jan 2024 395th KatieLG 🇬🇧 287 279 2,151ms 29 Aug 2024 397th MeWhenI 🇻🇦 286 231 7ms 16 Apr 2023 398th amollberg 🇸🇪 285 281 12ms 15 Jan 2022 399th acer-xq 285 371 486ms 26 Jul 2024 400th h3ra993huskp 🇯🇵 285 501 522ms 30 Nov 2025 First Prev 321–400 of 628 Next Last