The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Mahjong 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 161st duckyluuk 🇳🇱 559 192 440ms 29 Aug 2024 162nd MeWhenI 🇻🇦 558 378 19ms 8 Jul 2025 163rd helbling 🇨🇭 555 262 12ms 24 Oct 2024 164th Natanaelel 🇸🇪 555 335 525ms 25 Jun 2025 165th dokutan 550 195 2,443ms 14 Feb 2026 166th emgordon154 549 192 46ms 9 Aug 2024 167th ndren 536 210 24ms 14 Jul 2025 168th tayloia 🇬🇧 531 274 16ms 26 Jul 2024 169th albanian-laundromat 521 592 1,633ms 22 Oct 2025 170th JohandeRuiter 🇳🇱 519 340 2ms 13 Jul 2024 171st Seek64 🇩🇪 518 217 44ms 17 days ago 172nd targrik 509 286 24ms 9 Feb 2025 173rd MeWhenI 🇻🇦 503 424 74ms 12 Dec 2025 174th Shanethegamer 🇺🇸 500 211 40ms 8 Dec 2023 175th snoozingnewt 🇨🇦 494 297 107ms 21 Nov 2025 176th rucin93 🇵🇱 491 307 202ms 31 Oct 2024 177th dokutan 487 446 23ms 27 Dec 2025 178th SirBogman 🇺🇸 486 217 196ms 23 Dec 2023 179th edsrzf 🇳🇿 483 360 183ms 23 Jan 2026 180th Shanethegamer 🇺🇸 480 354 32ms 13 Dec 2023 181st KatieLG 🇬🇧 480 637 200ms 16 days ago 182nd bricknellj 479 235 22ms 26 Dec 2025 183rd MeWhenI 🇻🇦 475 306 18ms 6 Aug 2024 184th Shanethegamer 🇺🇸 473 263 241ms 7 Dec 2023 185th Shanethegamer 🇺🇸 468 311 14ms 7 Jan 2024 186th stefangimmillaro 466 226 74ms 6 Dec 2024 187th Shanethegamer 🇺🇸 464 231 777ms 18 Jan 2024 188th MeWhenI 🇻🇦 464 325 185ms 6 Aug 2024 189th MarcMush 🇫🇷 454 276 828ms 4 Feb 2024 190th Shanethegamer 🇺🇸 452 249 43ms 5 Dec 2023 191st bizy-coder 447 240 746ms 18 Jan 2024 192nd BREMAUCY 🇫🇷 445 253 110ms 4 Oct 2025 193rd tatzyr 🇯🇵 441 239 62ms 26 Mar 2025 194th bizy-coder 441 255 61ms 19 Aug 2024 195th janbehrens 🇩🇪 441 532 150ms 13 Dec 2023 196th h3ra993huskp 🇯🇵 441 602 697ms 30 Nov 2025 197th ryyyn 🇺🇸 434 259 90ms 5 Nov 2025 198th MeWhenI 🇻🇦 434 406 3ms 12 Dec 2025 199th scpchicken 🇵🇼 432 337 54ms 3 Jan 2024 200th KasperKivimaeki 🇫🇮 431 261 40ms 6 Jul 2025 201st emgordon154 431 402 132ms 26 Aug 2024 202nd Lv0Sys 🇵🇱 430 338 13ms 24 Feb 2026 203rd Natanaelel 🇸🇪 422 250 135ms 1 Dec 2023 204th Yewzir 🇧🇪 421 548 475ms 28 Jun 2024 205th keelimeguy 🇺🇸 417 270 2,319ms 17 May 2025 206th FlorianCassayre 🇫🇷 415 271 128ms 20 May 2024 207th rucin93 🇵🇱 415 639 576ms 24 Nov 2024 208th davecame 414 272 30ms 21 Feb 2024 209th Lv0Sys 🇵🇱 406 277 10ms 24 Feb 2026 210th MateuszPietrzak 🇵🇱 406 525 425ms 15 Dec 2023 211th CaedenHarper 🇨🇦 404 756 294ms 18 Nov 2025 212th RaBa21 🇭🇺 399 282 20ms 1 Aug 2025 213th lynn 397 283 48ms 7 Jul 2024 214th SB-945 392 287 19ms 7 Apr 2024 215th jared-hughes 391 288 116ms 18 Dec 2023 216th mousetail 🇳🇱 388 290 19ms 27 Aug 2024 216th robin-scragg 388 290 21ms 3 Oct 2025 216th JOrE20 388 290 14ms 3 Dec 2025 219th MeWhenI 🇻🇦 384 293 257ms 24 May 2024 220th sultan 383 294 782ms 3 Jun 2025 221st Natanaelel 🇸🇪 381 356 2,762ms 2 Dec 2023 222nd jerrandolph 381 664 305ms 24 Dec 2023 223rd CatsAreFluffy 380 561 88ms 15 Dec 2023 224th MeWhenI 🇻🇦 376 285 1,148ms 13 Jul 2024 225th LostSyntax21 🇬🇧 376 299 17ms 21 days ago 226th stefangimmillaro 374 301 189ms 6 Dec 2024 227th aksyristos 371 303 1,753ms 3 hours ago 228th GolfingSuccess 🇬🇷 370 290 808ms 6 Feb 2024 228th JOrE20 370 290 447ms 26 Feb 2026 230th MeWhenI 🇻🇦 367 323 1,619ms 15 Sep 2025 231st GolfingSuccess 🇬🇷 363 310 70ms 1 Dec 2023 232nd jacobly0 🇺🇸 361 947 1,942ms 22 Apr 2024 233rd anter69 🇭🇺 358 314 49ms 2 Dec 2025 234th JOrE20 356 409 23ms 7 Feb 2026 235th MateuszPietrzak 🇵🇱 355 497 10ms 15 Dec 2023 236th janbehrens 🇩🇪 352 753 716ms 13 Dec 2023 237th commandz0 🇺🇸 348 308 935ms 1 Sep 2025 238th wh3n3v3r 🇨🇿 346 325 20ms 18 Nov 2024 239th commandz0 🇺🇸 345 326 32ms 24 Mar 2024 240th byronknoll 🇺🇸 344 620 3,047ms 12 Feb 2024 First Prev 161–240 of 328 Next Last