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 bytes. 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 Bytes Time Submitted 321st DialFrost 🇸🇬 620 206 541ms 1 Dec 2024 322nd steef435 613 226 15ms 6 Jul 2025 323rd MarcMush 🇫🇷 611 155 1,454ms 18 Oct 2025 324th MeWhenI 🇻🇦 610 245 2,711ms 2 Dec 2024 325th qpwoeirut 605 229 33ms 25 Aug 2025 326th eranws 604 195 12ms 23 Dec 2024 327th tayloia 🇬🇧 601 196 12ms 12 Jan 2025 328th MostParsingVex 600 276 4ms 28 Dec 2024 329th keelimeguy 🇺🇸 597 232 34ms 14 Jun 2025 330th BREMAUCY 🇫🇷 596 637 13ms 15 Dec 2025 331st kmathis22 586 313 488ms 7 Dec 2025 332nd Ripick 580 266 421ms 8 Jun 2025 333rd KatieLG 🇬🇧 578 221 3,048ms 2 Jan 2026 334th alexsave 577 204 11ms 3 Dec 2024 335th matejmatik123 🇸🇰 571 265 1,410ms 17 Oct 2025 336th tatzyr 🇯🇵 567 165 1,857ms 15 Feb 2025 337th marcin7Cd 567 244 55ms 4 Feb 2025 338th retrohun 566 211 54ms 30 Dec 2024 339th luuumine 🇫🇷 565 245 11ms 21 Oct 2025 340th MeWhenI 🇻🇦 556 373 2,395ms 12 Dec 2024 341st TheZwierzLF 🇵🇱 549 252 3,919ms 1 Dec 2025 342nd MostParsingVex 548 147 114ms 21 Dec 2024 343rd MeWhenI 🇻🇦 547 201 1,110ms 29 Aug 2025 344th croc54 547 253 11ms 5 Jan 2025 345th elgan65536 🇺🇸 547 346 245ms 5 Dec 2024 346th voytxt 🇨🇿 540 218 10ms 1 Dec 2024 347th FlorianCassayre 🇫🇷 539 257 13ms 5 Aug 2025 348th h3ra993huskp 🇯🇵 539 340 524ms 30 Nov 2025 349th Emutis 🇱🇹 526 263 10ms 4 Nov 2025 350th prestosilver 🇺🇸 523 295 393ms 23 days ago 351st TheZwierzLF 🇵🇱 522 245 684ms 12 Dec 2025 352nd Apfelvater 521 266 11ms 29 hours ago 353rd blaztoma 🇱🇹 521 344 124ms 28 Nov 2025 354th mathisfun271 513 270 16ms 25 Jan 2025 355th JOrE20 511 264 3ms 5 Jan 2026 356th Jacob385 506 362 476ms 28 Oct 2025 357th Shotokhan 503 275 13ms 25 Sep 2025 358th LuisGoncalves05 🇵🇹 502 276 10ms 29 Jul 2025 358th SB-945 502 276 11ms 10 Sep 2025 360th bac0id 498 304 469ms 10 Jan 2025 361st olleicua 🇺🇸 490 191 36ms 11 Jun 2025 362nd madex 🇩🇪 489 283 10ms 25 Nov 2024 363rd PyryL 🇫🇮 486 285 15ms 8 Dec 2024 363rd mbittner20 486 285 11ms 10 Feb 2025 365th OllieBoyne 🇬🇧 484 286 13ms 6 Dec 2024 365th matsagad 484 286 10ms 12 Dec 2024 367th BREMAUCY 🇫🇷 481 288 11ms 22 Aug 2025 368th zakariamouhid 480 245 11ms 30 Nov 2024 368th gigaprofisi 🇺🇸 480 245 11ms 5 Jul 2025 370th JOrE20 473 379 121ms 5 Dec 2025 371st jerrandolph 471 398 298ms 25 Sep 2025 372nd Maashau 466 280 2ms 3 Dec 2025 373rd WillowWispy 465 298 11ms 21 Apr 2025 374th madex 🇩🇪 462 255 15ms 15 Dec 2024 375th bac0id 461 283 3ms 10 Jan 2025 376th msbranicky 457 424 3ms 20 Jan 2025 377th ShiraJoseph 🇺🇸 449 262 13ms 9 Dec 2024 378th Protothor 448 263 13ms 27 days ago 379th Ripick 447 212 540ms 11 Jul 2025 380th tomh1012 446 356 524ms 17 Feb 2026 381st Babafaba 441 314 19ms 17 Nov 2025 382nd TheZwierzLF 🇵🇱 440 213 47ms 5 Jan 2026 383rd JDiLenarda 🇫🇷 438 459 1,446ms 26 Jun 2025 384th acollett89 434 271 12ms 17 Jul 2025 385th dokutan 431 392 5ms 3 Dec 2025 386th retrohun 417 332 11ms 7 Dec 2024 387th galloj 🇨🇿 407 340 10ms 4 Dec 2024 388th Babafaba 403 317 562ms 17 Nov 2025 389th 123mjb 400 346 12ms 27 Nov 2025 390th violeta-desantis 396 329 3ms 11 Jan 2026 391st StefanHabel 🇨🇦 396 350 18ms 20 days ago 392nd dokutan 391 301 11ms 5 Jun 2025 393rd AidanWalter 390 355 14ms 27 Nov 2025 394th jameswmccarty 382 362 14ms 17 Feb 2025 395th msbranicky 378 366 11ms 5 Jan 2025 396th JOrE20 375 318 42ms 5 Jan 2026 397th rollershutter 375 369 20ms 24 Feb 2025 398th dokutan 370 374 22ms 29 Apr 2025 398th tomh1012 370 374 31ms 25 days ago 400th Andriamanitra 🇫🇮 369 254 34ms 8 Jun 2025 First Prev 321–400 of 508 Next Last