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?
Billiards 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 prestosilver 🇺🇸 520 295 393ms 23 days ago 322nd blaztoma 🇱🇹 518 344 124ms 28 Nov 2025 323rd ahmetdemirag 🇨🇾 512 183 11ms 5 Apr 2025 324th dokutan 512 194 12ms 15 Jun 2025 325th eranws 510 195 12ms 23 Dec 2024 326th dokutan 508 300 3ms 29 Apr 2025 327th tayloia 🇬🇧 507 196 12ms 12 Jan 2025 328th JOrE20 507 264 3ms 5 Jan 2026 329th CutSandstone 504 186 14ms 21 Dec 2024 330th Jacob385 504 362 476ms 28 Oct 2025 331st amberzit 501 187 14ms 6 Jul 2025 331st Babafaba 501 187 18ms 17 Nov 2025 331st WillConker 501 187 11ms 14 Dec 2025 334th Heathcorp 🇦🇺 498 188 11ms 31 Jan 2026 335th bac0id 495 304 469ms 10 Jan 2025 336th dokutan 489 186 131ms 15 Jun 2025 337th cros107 🇦🇺 488 192 38ms 28 Nov 2025 338th Shanethegamer 🇺🇸 488 216 17ms 5 Dec 2024 339th alexsave 487 204 11ms 3 Dec 2024 340th m-tkach 🇺🇦 485 193 21ms 6 Dec 2024 341st neihousaigaai 483 194 10ms 2 Dec 2024 341st lelbal 483 194 10ms 7 Mar 2025 343rd Babafaba 480 187 463ms 6 Nov 2025 344th 123mjb 473 198 12ms 27 Nov 2025 345th JOrE20 471 379 121ms 5 Dec 2025 346th MeWhenI 🇻🇦 469 201 1,110ms 29 Aug 2025 347th jerrandolph 469 398 298ms 25 Sep 2025 348th guilhem-roy 🇫🇷 464 202 13ms 29 May 2025 349th Maashau 463 280 2ms 3 Dec 2025 350th bac0id 458 283 3ms 10 Jan 2025 351st prplz 🇦🇺 457 205 21ms 31 Jan 2025 352nd voytxt 🇨🇿 456 218 10ms 1 Dec 2024 353rd solisolu 453 207 11ms 9 days ago 354th dokutan 451 209 1,319ms 30 Aug 2025 355th tomh1012 444 356 524ms 17 Feb 2026 356th dokutan 442 212 21ms 29 Apr 2025 357th DialFrost 🇸🇬 436 215 28ms 1 Dec 2024 358th JDiLenarda 🇫🇷 436 459 1,446ms 26 Jun 2025 359th DialFrost 🇸🇬 435 206 541ms 1 Dec 2024 360th DanS1024 432 217 10ms 3 Dec 2024 361st Lv0Sys 🇵🇱 430 218 15ms 22 Feb 2026 362nd FortuiteMan 🇫🇷 426 220 12ms 7 Jan 2026 363rd dokutan 425 211 407ms 14 Feb 2026 364th Ripick 415 212 540ms 11 Jul 2025 365th steef435 414 226 15ms 6 Jul 2025 366th qpwoeirut 409 229 33ms 25 Aug 2025 367th HumanoidCPU 407 230 96ms 10 Jan 2026 368th zakariamouhid 406 245 11ms 30 Nov 2024 368th gigaprofisi 🇺🇸 406 245 11ms 5 Jul 2025 370th HumanoidCPU 397 226 559ms 10 Jan 2026 371st violeta-desantis 394 329 3ms 11 Jan 2026 372nd dokutan 390 165 40ms 15 Jun 2025 373rd madex 🇩🇪 390 255 15ms 15 Dec 2024 374th msbranicky 389 424 3ms 20 Jan 2025 375th marcin7Cd 384 244 55ms 4 Feb 2025 376th ShiraJoseph 🇺🇸 379 262 13ms 9 Dec 2024 377th Protothor 378 263 13ms 27 Feb 2026 378th TheZwierzLF 🇵🇱 372 252 3,919ms 1 Dec 2025 379th JOrE20 372 318 42ms 5 Jan 2026 380th croc54 370 253 11ms 5 Jan 2025 381st acollett89 367 271 12ms 17 Jul 2025 382nd TheZwierzLF 🇵🇱 366 245 684ms 12 Dec 2025 383rd dokutan 358 397 122ms 29 Apr 2025 384th Emutis 🇱🇹 356 263 10ms 4 Nov 2025 385th keegan-t 🇨🇦 355 264 16ms 20 Apr 2025 386th alphafalfa 353 250 3ms 1 Aug 2025 387th msbranicky 353 421 2,741ms 7 Jan 2025 388th Apfelvater 352 266 11ms 32 hours ago 389th mathisfun271 347 270 16ms 25 Jan 2025 390th madeforlosers 344 289 12ms 28 Apr 2025 391st Shotokhan 341 275 13ms 25 Sep 2025 392nd LuisGoncalves05 🇵🇹 339 276 10ms 29 Jul 2025 393rd olleicua 🇺🇸 337 191 36ms 11 Jun 2025 394th madex 🇩🇪 331 283 10ms 25 Nov 2024 395th PyryL 🇫🇮 329 285 15ms 8 Dec 2024 395th mbittner20 329 285 11ms 10 Feb 2025 397th OllieBoyne 🇬🇧 328 286 13ms 6 Dec 2024 397th matsagad 328 286 10ms 12 Dec 2024 399th dokutan 326 295 1,244ms 29 Apr 2025 400th BREMAUCY 🇫🇷 325 288 11ms 22 Aug 2025 First Prev 321–400 of 505 Next Last