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 241st Kacarott 🇦🇺 622 167 80ms 19 Nov 2025 242nd emplv 🇱🇻 615 148 158ms 28 Jan 2026 243rd MeWhenI 🇻🇦 612 105 37ms 3 Jan 2025 244th FlorianCassayre 🇫🇷 608 154 14ms 5 Aug 2025 245th blaztoma 🇱🇹 607 106 35ms 18 Jan 2026 246th MeWhenI 🇻🇦 607 245 2,711ms 2 Dec 2024 247th ovs-code 🇩🇪 604 155 42ms 29 Nov 2024 247th xnor-gate 604 155 82ms 26 Feb 2025 249th lifthrasiir 🇰🇷 603 165 10ms 26 Nov 2024 250th error256 601 107 43ms 3 Dec 2024 250th tatzyr 🇯🇵 601 107 1,857ms 15 Feb 2025 252nd nwellnhof 🇩🇪 597 157 29ms 18 Jul 2025 252nd Seek64 🇩🇪 597 157 39ms 23 hours ago 254th edsrzf 🇳🇿 597 174 65ms 31 Jul 2025 255th MostParsingVex 596 276 4ms 28 Dec 2024 256th BREMAUCY 🇫🇷 594 637 13ms 15 Dec 2025 257th GolfingSuccess 🇬🇷 593 158 27ms 26 Nov 2024 258th emgordon154 593 174 6ms 27 Dec 2024 259th ovs-code 🇩🇪 591 154 181ms 17 Apr 2025 260th ovs-code 🇩🇪 590 152 451ms 1 Dec 2024 261st Shanethegamer 🇺🇸 590 176 64ms 6 Dec 2024 262nd davecame 589 159 371ms 15 Jan 2026 263rd GolfingSuccess 🇬🇷 588 68 67ms 24 Nov 2024 264th lynn 585 160 27ms 3 Jan 2025 264th kops-cg 585 160 42ms 24 Feb 2025 266th CaedenHarper 🇨🇦 585 170 12ms 23 Aug 2025 267th kmathis22 583 313 488ms 7 Dec 2025 268th ovs-code 🇩🇪 582 165 127ms 11 Dec 2025 269th Natanaelel 🇸🇪 579 111 38ms 2 Dec 2024 270th aksyristos 578 162 11ms 2 hours ago 271st Ripick 577 266 421ms 8 Jun 2025 272nd GolfingSuccess 🇬🇷 575 156 494ms 26 Nov 2024 273rd SB-945 575 163 12ms 12 Sep 2025 273rd bizy-coder 575 163 11ms 3 Dec 2025 273rd blaztoma 🇱🇹 575 163 11ms 21 Dec 2025 276th stefangimmillaro 569 113 34ms 26 Dec 2024 277th 5cw 🇺🇸 568 165 10ms 24 Nov 2024 278th matejmatik123 🇸🇰 568 265 1,410ms 17 Oct 2025 279th GrayJoKing 🇦🇺 562 185 63ms 15 Dec 2025 280th fourth-bit 561 167 11ms 1 Dec 2024 280th Bulmenisaurus 561 167 33ms 30 Jun 2025 282nd retrohun 561 211 54ms 30 Dec 2024 283rd Shanethegamer 🇺🇸 561 254 43ms 3 Dec 2024 284th MeWhenI 🇻🇦 558 168 10ms 17 Apr 2025 284th ryyyn 🇺🇸 558 168 722ms 2 Feb 2026 286th MeWhenI 🇻🇦 553 373 2,395ms 12 Dec 2024 287th emgordon154 550 117 36ms 1 Dec 2024 288th AlephSquirrel 548 171 10ms 5 Dec 2024 289th Shanethegamer 🇺🇸 545 118 41ms 2 Dec 2024 290th MostParsingVex 545 146 166ms 21 Dec 2024 291st scpchicken 🇵🇼 545 172 11ms 4 Dec 2024 292nd Shanethegamer 🇺🇸 544 165 549ms 4 Dec 2024 293rd elgan65536 🇺🇸 544 346 245ms 5 Dec 2024 294th Shanethegamer 🇺🇸 541 173 17ms 2 Dec 2024 294th dirckvdende 541 173 11ms 25 Jul 2025 294th CaedenHarper 🇨🇦 541 173 10ms 16 Oct 2025 297th commandz0 🇺🇸 538 174 11ms 1 Dec 2024 297th stefangimmillaro 538 174 10ms 2 Dec 2024 297th SirBogman 🇺🇸 538 174 18ms 15 Jul 2025 300th h3ra993huskp 🇯🇵 537 340 524ms 30 Nov 2025 301st SirBogman 🇺🇸 536 120 36ms 18 Jul 2025 302nd error256 535 175 10ms 1 Dec 2024 302nd KasperKivimaeki 🇫🇮 535 175 17ms 5 Jul 2025 304th Shanethegamer 🇺🇸 535 178 107ms 25 Nov 2025 305th MeWhenI 🇻🇦 534 168 498ms 17 Apr 2025 306th annaproxy 532 176 10ms 22 Jan 2025 306th YAJUE114514 532 176 11ms 28 Jul 2025 306th bricknellj 532 176 11ms 3 Dec 2025 309th AlephSquirrel 531 169 625ms 5 Dec 2024 309th commandz0 🇺🇸 531 169 557ms 1 Sep 2025 311th moustave 529 177 11ms 9 Apr 2025 312th SirBogman 🇺🇸 528 170 699ms 19 Jul 2025 313th inventshah 526 178 10ms 1 Dec 2024 313th zacjl 526 178 36ms 4 Dec 2024 315th CaedenHarper 🇨🇦 524 171 686ms 16 Oct 2025 316th jared-hughes 523 179 11ms 22 Dec 2024 316th InigoK 🇺🇸 523 179 15ms 9 Oct 2025 318th trinityy-7 523 190 12ms 23 Jul 2025 319th emgordon154 520 175 144ms 1 Dec 2024 320th prestosilver 🇺🇸 520 295 393ms 22 days ago First Prev 241–320 of 504 Next Last