The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 Sp3000 🇦🇺 413 194 12ms 20 Nov 2021 322nd annaproxy 410 335 171ms 4 Sep 2022 323rd emgordon154 408 318 12ms 4 days ago 324th KatieLG 🇬🇧 406 162 34ms 3 Oct 2025 325th RaBa21 🇭🇺 405 198 19ms 1 Aug 2025 326th helbling 🇨🇭 401 239 13ms 21 Oct 2024 327th DialFrost 🇸🇬 399 178 614ms 23 May 2024 328th MeWhenI 🇻🇦 399 265 419ms 21 Nov 2021 329th adamnielson42 🇺🇸 397 202 12ms 25 Apr 2023 330th Waffle3z 396 166 40ms 9 Nov 2021 331st vishwathg 393 204 62ms 27 Sep 2022 332nd roguh 🇬🇹 392 189 534ms 18 Oct 2024 333rd JOrE20 389 246 27ms 20 Feb 2026 334th MeWhenI 🇻🇦 386 203 306ms 28 Jan 2023 335th ahmetdemirag 🇨🇾 385 208 12ms 25 Nov 2024 336th coreynash 382 251 10ms 20 Nov 2023 337th MeWhenI 🇻🇦 381 186 399ms 15 Feb 2023 338th snoozingnewt 🇨🇦 379 253 12ms 4 Nov 2025 339th quirked-up 373 257 11ms 31 Aug 2023 340th MeWhenI 🇻🇦 372 366 1,373ms 4 Nov 2021 341st uttumuttu 🇫🇮 370 259 11ms 9 Jan 2022 342nd CatsAreFluffy 366 324 2ms 4 Feb 2023 343rd lynn 361 329 2ms 8 Feb 2022 344th InigoK 🇺🇸 359 223 28ms 23 Sep 2025 345th stefangimmillaro 359 359 5ms 2 Jul 2023 346th RYNO8 358 224 19ms 10 Nov 2021 347th janbehrens 🇩🇪 355 226 12ms 17 Jun 2023 348th janbehrens 🇩🇪 355 402 506ms 14 Nov 2021 349th janbehrens 🇩🇪 350 302 434ms 21 Nov 2021 350th KatieLG 🇬🇧 348 783 12ms 19 May 2024 351st madex 🇩🇪 347 350 532ms 9 days ago 352nd janbehrens 🇩🇪 346 205 527ms 14 Nov 2021 353rd ShiraJoseph 🇺🇸 342 280 11ms 21 Jul 2023 354th MeWhenI 🇻🇦 342 313 30ms 21 Jun 2022 355th madex 🇩🇪 342 398 1,303ms 9 days ago 356th wh3n3v3r 🇨🇿 341 235 15ms 14 Nov 2024 357th snoozingnewt 🇨🇦 339 373 304ms 10 Feb 2026 358th Pyroan 338 237 19ms 15 Mar 2025 359th roguh 🇬🇹 337 314 445ms 18 Oct 2024 360th StefanHabel 🇨🇦 334 240 17ms 22 days ago 361st DialFrost 🇸🇬 333 241 19ms 20 May 2024 362nd TFeld00 🇩🇰 330 243 161ms 3 Oct 2022 363rd DialFrost 🇸🇬 328 226 626ms 24 May 2024 364th MeWhenI 🇻🇦 325 296 315ms 12 Nov 2022 365th ericlangedijk 🇸🇮 322 328 456ms 20 Mar 2022 366th FlorianCassayre 🇫🇷 319 251 13ms 5 Aug 2025 367th msbranicky 319 584 292ms 7 Sep 2023 368th prplz 🇦🇺 318 252 18ms 22 Oct 2023 368th davecame 318 252 13ms 15 Oct 2025 368th Babafaba 318 252 20ms 29 Oct 2025 371st janbehrens 🇩🇪 314 477 2,814ms 20 Nov 2022 372nd MichalMarsalek 🇨🇿 312 257 13ms 5 Nov 2021 372nd robin-scragg 312 257 12ms 3 Oct 2025 372nd FortuiteMan 🇫🇷 312 257 19ms 1 Dec 2025 375th heanyang1 310 383 2ms 28 May 2025 376th commandz0 🇺🇸 307 241 644ms 1 Sep 2025 377th jakobkordez 🇸🇮 304 264 18ms 8 Nov 2022 378th heanyang1 302 451 1,477ms 23 May 2025 379th BambooleanLogic 🇸🇪 300 319 10ms 13 Jul 2023 380th dokutan 299 268 19ms 26 Dec 2025 381st janbehrens 🇩🇪 298 458 877ms 14 Nov 2021 382nd Mabeloid 🇳🇴 297 270 12ms 10 Jun 2025 383rd janbehrens 🇩🇪 296 223 4ms 14 Nov 2021 384th Babafaba 294 252 412ms 29 Oct 2025 385th MeWhenI 🇻🇦 294 269 178ms 3 Aug 2024 386th annaproxy 294 360 435ms 25 Apr 2022 387th neel11235813 294 413 457ms 1 Apr 2024 387th snoozingnewt 🇨🇦 294 413 470ms 29 Sep 2025 389th madex 🇩🇪 293 361 433ms 9 days ago 390th blaztoma 🇱🇹 291 226 37ms 19 Oct 2025 391st jerrandolph 291 641 299ms 1 Oct 2025 392nd JOrE20 289 277 13ms 4 Dec 2025 393rd MeWhenI 🇻🇦 289 299 1,190ms 15 Sep 2025 394th yuchuehw 287 279 19ms 23 Jan 2024 394th KatieLG 🇬🇧 287 279 2,151ms 29 Aug 2024 396th MeWhenI 🇻🇦 286 231 7ms 16 Apr 2023 397th amollberg 🇸🇪 285 281 12ms 15 Jan 2022 398th acer-xq 285 371 486ms 26 Jul 2024 399th h3ra993huskp 🇯🇵 285 501 522ms 30 Nov 2025 400th MeWhenI 🇻🇦 283 308 1,039ms 20 Oct 2024 First Prev 321–400 of 627 Next Last