The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Proximity Grid 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 401st DialFrost 🇸🇬 399 248 13ms 10 Feb 2023 402nd VictorFordham 397 227 451ms 17 Nov 2024 402nd JunkIce 397 227 38ms 13 Feb 2025 402nd madex 🇩🇪 397 227 19ms 5 days ago 405th TheZwierzLF 🇵🇱 392 164 59ms 27 Dec 2025 406th janbehrens 🇩🇪 392 184 1,059ms 24 Nov 2022 407th msbranicky 392 283 2,691ms 7 Jan 2025 408th neihousaigaai 390 231 12ms 5 Oct 2024 409th 40fied4t 388 232 159ms 6 May 2025 410th Tess2662 387 233 21ms 20 Sep 2022 410th klixel 🇨🇦 387 233 11ms 26 Nov 2025 412th Ripick 386 334 3ms 22 Oct 2025 413th YAJUE114514 385 234 37ms 14 Dec 2025 414th bac0id 380 339 2ms 23 Jun 2024 415th JunkIce 378 227 459ms 13 Feb 2025 416th CatsAreFluffy 374 241 65ms 5 Jan 2024 416th qpwoeirut 374 241 147ms 2 Oct 2025 418th MeWhenI 🇻🇦 373 308 2,192ms 22 Nov 2023 419th TheZwierzLF 🇵🇱 371 243 45ms 23 May 2025 420th TheZwierzLF 🇵🇱 368 233 701ms 7 Dec 2025 421st adamnielson42 🇺🇸 368 245 28ms 22 May 2023 422nd Szum123321 🇵🇱 367 351 2ms 9 Dec 2023 423rd msbranicky 366 336 4ms 28 Sep 2023 424th Schmitt-Very-Cool 363 364 492ms 3 Oct 2025 425th msbranicky 362 249 16ms 9 Aug 2023 425th StefanHabel 🇨🇦 362 249 441ms 2 Sep 2023 427th jacobly0 🇺🇸 361 532 2,002ms 22 Apr 2024 428th zakariamouhid 354 280 17ms 2 Jun 2023 429th andrewjc2000 353 255 14ms 30 Jul 2025 430th dokutan 345 209 650ms 7 Apr 2024 431st Lv0Sys 🇵🇱 345 287 14ms 27 days ago 432nd msbranicky 343 250 677ms 16 Jan 2024 433rd RYNO8 341 264 18ms 16 Aug 2022 434th CaedenHarper 🇨🇦 341 461 425ms 21 Oct 2025 435th mathisfun271 340 265 16ms 5 Mar 2024 436th logvp 330 273 13ms 8 Jan 2024 437th dillon-duncando 329 392 3ms 19 Oct 2022 438th msbranicky 328 220 617ms 15 Jan 2024 439th Pyroan 325 277 61ms 13 Mar 2025 440th jacobly0 🇺🇸 325 378 87ms 11 Sep 2023 441st LeeCamp 323 279 34ms 13 Jan 2023 442nd MaxElf999 318 283 33ms 6 Apr 2025 443rd uttumuttu 🇫🇮 318 311 20ms 31 Aug 2022 444th gigaprofisi 🇺🇸 317 312 13ms 16 Jul 2025 445th guilhem-roy 🇫🇷 316 285 89ms 30 Aug 2022 446th janbehrens 🇩🇪 314 203 16ms 19 Nov 2022 447th celiendonze 🇨🇭 312 289 66ms 28 Apr 2023 448th OllieBoyne 🇬🇧 306 295 11ms 5 Aug 2022 448th TobyBoyne 🇬🇧 306 295 12ms 5 Aug 2022 450th Bmrl7 304 296 19ms 26 Dec 2025 451st postie77 297 529 393ms 14 Aug 2024 452nd WillowWispy 296 304 65ms 22 Mar 2025 453rd Natanaelel 🇸🇪 293 209 723ms 8 Feb 2023 454th bac0id 293 451 611ms 26 Sep 2023 455th jgbaldwinbrown 291 442 5ms 31 Aug 2022 456th stefangimmillaro 287 336 121ms 13 Oct 2022 457th KingSkyrock 🇺🇸 285 348 22ms 23 Dec 2022 458th janAkali 🇷🇺 285 401 372ms 15 days ago 459th Andre3582 283 319 552ms 29 Oct 2022 460th ThijsLuttikhuis 281 321 3,425ms 7 Apr 2024 461st adoxography 280 322 18ms 25 Mar 2023 462nd martinnorling 🇸🇪 278 324 12ms 19 Aug 2022 463rd CaedenHarper 🇨🇦 277 311 1,484ms 27 Sep 2025 464th CaedenHarper 🇨🇦 273 485 490ms 9 Oct 2025 465th SirFireball3521 271 226 491ms 19 Jul 2024 466th CaedenHarper 🇨🇦 270 334 34ms 27 Sep 2025 467th didion0 🇺🇸 266 373 23ms 5 Aug 2022 468th CaedenHarper 🇨🇦 265 324 694ms 22 Sep 2025 469th fgrosshans 🇫🇷 262 344 50ms 24 Sep 2023 470th dillon-duncando 256 352 184ms 12 Oct 2022 471st CaedenHarper 🇨🇦 253 392 13ms 29 Aug 2025 472nd alemelis 252 357 468ms 19 Sep 2024 473rd Jacob385 251 526 448ms 19 Mar 2024 474th madex 🇩🇪 247 719 315ms 13 Aug 2025 475th glesnick 242 372 247ms 17 Aug 2022 476th JGDoerrer 240 741 221ms 12 Aug 2022 477th inverseLorentz 🇦🇺 237 381 11ms 22 Feb 2024 478th za3k 234 385 26ms 12 Oct 2022 479th FortuiteMan 🇫🇷 233 386 18ms 29 Aug 2023 480th JOrE20 229 930 26ms 12 Feb 2026 First Prev 401–480 of 596 Next Last