The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 trinityy-7 620 190 12ms 23 Jul 2025 322nd DialFrost 🇸🇬 620 206 541ms 1 Dec 2024 323rd steef435 613 226 15ms 6 Jul 2025 324th MarcMush 🇫🇷 611 155 1,454ms 18 Oct 2025 325th MeWhenI 🇻🇦 610 245 2,711ms 2 Dec 2024 326th qpwoeirut 605 229 33ms 25 Aug 2025 327th eranws 604 195 12ms 23 Dec 2024 328th tayloia 🇬🇧 601 196 12ms 12 Jan 2025 329th MostParsingVex 600 276 4ms 28 Dec 2024 330th keelimeguy 🇺🇸 597 232 34ms 14 Jun 2025 331st BREMAUCY 🇫🇷 596 637 13ms 15 Dec 2025 332nd kmathis22 586 313 488ms 7 Dec 2025 333rd Ripick 580 266 421ms 8 Jun 2025 334th KatieLG 🇬🇧 578 221 3,048ms 2 Jan 2026 335th alexsave 577 204 11ms 3 Dec 2024 336th matejmatik123 🇸🇰 571 265 1,410ms 17 Oct 2025 337th tatzyr 🇯🇵 567 165 1,857ms 15 Feb 2025 338th marcin7Cd 567 244 55ms 4 Feb 2025 339th retrohun 566 211 54ms 30 Dec 2024 340th luuumine 🇫🇷 565 245 11ms 21 Oct 2025 341st MeWhenI 🇻🇦 556 373 2,395ms 12 Dec 2024 342nd TheZwierzLF 🇵🇱 549 252 3,919ms 1 Dec 2025 343rd MostParsingVex 548 147 114ms 21 Dec 2024 344th MeWhenI 🇻🇦 547 201 1,110ms 29 Aug 2025 345th croc54 547 253 11ms 5 Jan 2025 346th elgan65536 🇺🇸 547 346 245ms 5 Dec 2024 347th voytxt 🇨🇿 540 218 10ms 1 Dec 2024 348th FlorianCassayre 🇫🇷 539 257 13ms 5 Aug 2025 349th h3ra993huskp 🇯🇵 539 340 524ms 30 Nov 2025 350th Emutis 🇱🇹 526 263 10ms 4 Nov 2025 351st prestosilver 🇺🇸 523 295 393ms 23 days ago 352nd TheZwierzLF 🇵🇱 522 245 684ms 12 Dec 2025 353rd Apfelvater 521 266 11ms 44 hours ago 354th blaztoma 🇱🇹 521 344 124ms 28 Nov 2025 355th mathisfun271 513 270 16ms 25 Jan 2025 356th JOrE20 511 264 3ms 5 Jan 2026 357th Jacob385 506 362 476ms 28 Oct 2025 358th Shotokhan 503 275 13ms 25 Sep 2025 359th LuisGoncalves05 🇵🇹 502 276 10ms 29 Jul 2025 359th SB-945 502 276 11ms 10 Sep 2025 361st bac0id 498 304 469ms 10 Jan 2025 362nd olleicua 🇺🇸 490 191 36ms 11 Jun 2025 363rd madex 🇩🇪 489 283 10ms 25 Nov 2024 364th PyryL 🇫🇮 486 285 15ms 8 Dec 2024 364th mbittner20 486 285 11ms 10 Feb 2025 366th OllieBoyne 🇬🇧 484 286 13ms 6 Dec 2024 366th matsagad 484 286 10ms 12 Dec 2024 368th BREMAUCY 🇫🇷 481 288 11ms 22 Aug 2025 369th zakariamouhid 480 245 11ms 30 Nov 2024 369th gigaprofisi 🇺🇸 480 245 11ms 5 Jul 2025 371st JOrE20 473 379 121ms 5 Dec 2025 372nd jerrandolph 471 398 298ms 25 Sep 2025 373rd Maashau 466 280 2ms 3 Dec 2025 374th WillowWispy 465 298 11ms 21 Apr 2025 375th madex 🇩🇪 462 255 15ms 15 Dec 2024 376th bac0id 461 283 3ms 10 Jan 2025 377th msbranicky 457 424 3ms 20 Jan 2025 378th ShiraJoseph 🇺🇸 449 262 13ms 9 Dec 2024 379th Protothor 448 263 13ms 27 Feb 2026 380th Ripick 447 212 540ms 11 Jul 2025 381st tomh1012 446 356 524ms 17 Feb 2026 382nd Babafaba 441 314 19ms 17 Nov 2025 383rd TheZwierzLF 🇵🇱 440 213 47ms 5 Jan 2026 384th JDiLenarda 🇫🇷 438 459 1,446ms 26 Jun 2025 385th acollett89 434 271 12ms 17 Jul 2025 386th dokutan 431 392 5ms 3 Dec 2025 387th retrohun 417 332 11ms 7 Dec 2024 388th galloj 🇨🇿 407 340 10ms 4 Dec 2024 389th Babafaba 403 317 562ms 17 Nov 2025 390th 123mjb 400 346 12ms 27 Nov 2025 391st violeta-desantis 396 329 3ms 11 Jan 2026 392nd StefanHabel 🇨🇦 396 350 18ms 21 days ago 393rd dokutan 391 301 11ms 5 Jun 2025 394th AidanWalter 390 355 14ms 27 Nov 2025 395th jameswmccarty 382 362 14ms 17 Feb 2025 396th msbranicky 378 366 11ms 5 Jan 2025 397th JOrE20 375 318 42ms 5 Jan 2026 398th rollershutter 375 369 20ms 24 Feb 2025 399th dokutan 370 374 22ms 29 Apr 2025 399th tomh1012 370 374 31ms 25 days ago First Prev 321–400 of 509 Next Last