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 1st zacjl 1,000 45 3ms 28 Apr 2025 1st ovs-code 🇩🇪 1,000 45 45ms 17 Nov 2025 3rd 2bular 980 50 33ms 4 Nov 2025 3rd ovs-code 🇩🇪 980 50 32ms 4 Nov 2025 5th 2bular 978 46 3ms 4 May 2025 6th emgordon154 971 53 91ms 9 Nov 2025 7th pardouin 🇫🇷 948 146 16ms 1 Dec 2024 8th lifthrasiir 🇰🇷 936 148 32ms 26 Nov 2024 8th btnlq 936 148 100ms 2 Dec 2024 10th ovs-code 🇩🇪 927 101 39ms 5 Dec 2024 11th emplv 🇱🇻 927 127 11ms 19 Dec 2024 12th nwellnhof 🇩🇪 918 102 38ms 10 Jul 2025 12th pardouin 🇫🇷 918 102 33ms 25 Aug 2025 14th pardouin 🇫🇷 913 140 623ms 17 Apr 2025 15th GrayJoKing 🇦🇺 906 89 169ms 8 Apr 2025 16th pardouin 🇫🇷 906 107 1,514ms 11 Apr 2025 17th antimon2 🇯🇵 902 105 687ms 1 Dec 2024 18th canissimia 🇦🇶 900 99 3ms 11 Jan 2026 19th lyphyser 899 91 54ms 27 Dec 2024 20th ovs-code 🇩🇪 899 131 10ms 1 Dec 2024 20th nwellnhof 🇩🇪 899 131 10ms 16 Jul 2025 22nd saito-ta 🇯🇵 893 146 3ms 2 Dec 2024 22nd ovs-code 🇩🇪 893 146 12ms 17 Dec 2024 24th ovs-code 🇩🇪 893 155 42ms 29 Nov 2024 24th xnor-gate 893 155 82ms 26 Feb 2025 26th MeWhenI 🇻🇦 892 105 37ms 3 Jan 2025 27th saito-ta 🇯🇵 890 106 180ms 25 Nov 2024 28th saito-ta 🇯🇵 887 58 99ms 1 Dec 2024 29th Steffan153 🇫🇮 887 124 831ms 15 Feb 2026 30th blaztoma 🇱🇹 883 106 35ms 18 Jan 2026 31st nwellnhof 🇩🇪 882 118 315ms 18 Jul 2025 32nd nwellnhof 🇩🇪 882 157 29ms 18 Jul 2025 32nd Seek64 🇩🇪 882 157 39ms 29 hours ago 34th lifthrasiir 🇰🇷 881 145 479ms 2 Dec 2024 35th stefangimmillaro 881 208 578ms 6 Oct 2025 36th nwellnhof 🇩🇪 881 213 288ms 19 Jul 2025 37th ovs-code 🇩🇪 880 172 607ms 1 Dec 2024 38th AdrienHache 🇫🇷 878 181 431ms 3 Nov 2025 39th emplv 🇱🇻 877 148 158ms 28 Jan 2026 40th GolfingSuccess 🇬🇷 876 158 27ms 26 Nov 2024 41st error256 875 107 43ms 3 Dec 2024 42nd emplv 🇱🇻 873 147 7ms 15 Jul 2025 43rd sean-niemann 🇺🇸 871 149 153ms 19 May 2025 44th hallvabo 🇳🇴 871 159 46ms 7 Dec 2024 44th davecame 871 159 371ms 15 Jan 2026 46th edsrzf 🇳🇿 869 143 6ms 23 Jun 2025 47th pardouin 🇫🇷 869 172 2,811ms 12 May 2025 48th sean-niemann 🇺🇸 869 211 435ms 24 Sep 2025 49th Yax42 🇫🇷 868 183 392ms 16 Jun 2025 50th ovs-code 🇩🇪 867 165 162ms 4 Jan 2025 50th Steffan153 🇫🇮 867 165 112ms 12 Feb 2026 52nd edsrzf 🇳🇿 866 168 22ms 25 Jun 2025 53rd saito-ta 🇯🇵 865 138 54ms 2 Dec 2024 54th lynn 865 160 27ms 3 Jan 2025 54th kops-cg 865 160 42ms 24 Feb 2025 56th kg583 🇺🇸 865 170 10ms 15 Dec 2025 57th namelessiw 865 212 500ms 2 Dec 2025 58th weeble 864 141 5ms 15 Dec 2024 59th sean-niemann 🇺🇸 864 156 3ms 19 Nov 2025 60th namelessiw 864 184 417ms 2 Dec 2025 61st acotis 864 219 196ms 28 Dec 2025 62nd KasperKivimaeki 🇫🇮 863 151 3ms 16 Nov 2025 63rd edsrzf 🇳🇿 863 179 428ms 17 Aug 2025 64th stefangimmillaro 862 202 138ms 3 Dec 2024 65th lynn 861 166 151ms 3 Jan 2025 65th edsrzf 🇳🇿 861 166 115ms 12 Feb 2026 67th snoozingnewt 🇨🇦 860 161 18ms 22 days ago 68th Kacarott 🇦🇺 860 167 80ms 19 Nov 2025 69th MeWhenI 🇻🇦 860 168 21ms 4 Jan 2025 70th stefangimmillaro 859 174 2,907ms 2 Dec 2024 71st xsot 🇸🇬 857 104 3ms 1 Dec 2024 72nd edsrzf 🇳🇿 857 179 3ms 12 Feb 2026 73rd Mukundan314 855 162 113ms 4 Jul 2025 73rd Flekay 🇩🇪 855 162 11ms 22 days ago 73rd aksyristos 855 162 11ms 9 hours ago 76th emgordon154 855 170 19ms 6 Jun 2025 77th bitsandbeyond 🇳🇱 853 122 512ms 5 Nov 2025 78th edsrzf 🇳🇿 853 129 1,405ms 18 Feb 2026 79th pardouin 🇫🇷 853 138 10ms 28 Nov 2024 79th sean-niemann 🇺🇸 853 138 10ms 8 Dec 2024 1–80 of 509 Next Last