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 81st albanian-laundromat 853 227 3ms 21 days ago 82nd AdrienHache 🇫🇷 852 96 57ms 7 Dec 2024 83rd Shanethegamer 🇺🇸 852 174 193ms 24 May 2025 84th edsrzf 🇳🇿 852 198 5ms 21 days ago 85th ovs-code 🇩🇪 851 176 472ms 1 Dec 2024 86th KasperKivimaeki 🇫🇮 851 178 513ms 26 days ago 87th kg583 🇺🇸 850 171 26ms 9 days ago 88th snoozingnewt 🇨🇦 850 211 104ms 23 days ago 89th snoozingnewt 🇨🇦 849 158 111ms 23 days ago 90th bizy-coder 849 163 11ms 3 Dec 2025 90th blaztoma 🇱🇹 849 163 11ms 21 Dec 2025 92nd stefangimmillaro 849 221 313ms 5 Dec 2024 92nd edsrzf 🇳🇿 849 221 303ms 24 Jun 2025 94th edsrzf 🇳🇿 849 228 6ms 21 days ago 95th pardouin 🇫🇷 848 153 163ms 2 Dec 2024 96th rucin93 🇵🇱 847 139 12ms 3 Dec 2024 97th MeWhenI 🇻🇦 846 141 11ms 9 Jul 2025 98th sean-niemann 🇺🇸 846 177 462ms 19 Jul 2025 99th SirBogman 🇺🇸 846 194 45ms 17 Jul 2025 100th ovs-code 🇩🇪 844 61 113ms 6 Dec 2024 101st kg583 🇺🇸 844 164 21ms 22 Nov 2024 102nd lynn 844 224 207ms 4 Dec 2025 103rd sean-niemann 🇺🇸 844 245 27ms 9 Feb 2026 104th Natanaelel 🇸🇪 843 111 38ms 2 Dec 2024 105th ovs-code 🇩🇪 843 154 181ms 17 Apr 2025 106th kg583 🇺🇸 843 211 40ms 13 Feb 2025 107th edsrzf 🇳🇿 842 176 203ms 28 Feb 2026 108th Shanethegamer 🇺🇸 842 178 107ms 25 Nov 2025 108th albanian-laundromat 842 178 120ms 24 Dec 2025 110th albanian-laundromat 842 213 45ms 9 days ago 111th ovs-code 🇩🇪 841 152 451ms 1 Dec 2024 112th Yax42 🇫🇷 841 218 392ms 4 Oct 2025 112th MeWhenI 🇻🇦 841 218 558ms 7 Nov 2025 114th kg583 🇺🇸 840 148 6ms 22 days ago 115th CLOStrophobic 🇮🇹 840 175 34ms 6 Mar 2025 116th 5cw 🇺🇸 839 165 10ms 24 Nov 2024 117th IanUtley 839 189 163ms 29 Nov 2024 118th edsrzf 🇳🇿 838 238 31ms 10 Feb 2026 119th Shanethegamer 🇺🇸 838 240 1,388ms 29 May 2025 120th saito-ta 🇯🇵 836 248 323ms 5 Dec 2024 121st targrik 835 141 11ms 27 Mar 2025 121st Lv0Sys 🇵🇱 835 141 12ms 22 Feb 2026 123rd edsrzf 🇳🇿 835 167 8ms 18 days ago 124th annaproxy 835 190 18ms 22 Jan 2025 125th ovs-code 🇩🇪 834 146 9ms 12 Jan 2025 125th emgordon154 834 146 6ms 9 Sep 2025 127th Shanethegamer 🇺🇸 834 149 5ms 5 Dec 2024 128th Steffan153 🇫🇮 834 166 17ms 12 Feb 2026 129th xsot 🇸🇬 833 154 24ms 22 May 2025 130th emgordon154 833 364 1,602ms 29 May 2025 131st albanian-laundromat 830 226 265ms 29 Jan 2026 132nd Liniarc 829 142 11ms 28 Nov 2024 133rd fourth-bit 829 167 11ms 1 Dec 2024 133rd Bulmenisaurus 829 167 33ms 30 Jun 2025 135th FlyingPenguin223 829 185 2ms 29 Dec 2025 136th stefangimmillaro 828 113 34ms 26 Dec 2024 136th Steffan153 🇫🇮 828 113 38ms 12 Feb 2026 138th blaztoma 🇱🇹 828 114 3ms 16 days ago 139th Shanethegamer 🇺🇸 828 366 1,447ms 14 Apr 2025 139th albanian-laundromat 828 366 1,446ms 31 Jan 2026 141st edsrzf 🇳🇿 826 174 65ms 31 Jul 2025 142nd emgordon154 825 169 9ms 21 days ago 143rd MeWhenI 🇻🇦 824 168 10ms 17 Apr 2025 143rd CornerMercury 🇬🇧 824 168 17ms 4 Jan 2026 143rd ryyyn 🇺🇸 824 168 722ms 2 Feb 2026 146th edsrzf 🇳🇿 824 201 6ms 14 Oct 2025 147th Yax42 🇫🇷 823 143 11ms 12 Sep 2025 148th nwellnhof 🇩🇪 822 98 194ms 10 Jul 2025 149th error256 822 118 1,305ms 11 Apr 2025 149th edsrzf 🇳🇿 822 118 1,369ms 14 Feb 2026 151st targrik 822 156 15ms 22 days ago 152nd GolfingSuccess 🇬🇷 819 156 494ms 26 Nov 2024 153rd ndren 819 169 11ms 2 Dec 2024 154th emgordon154 819 219 119ms 5 Dec 2025 155th albanian-laundromat 819 463 27ms 8 Dec 2025 156th pardouin 🇫🇷 818 185 511ms 27 days ago 157th MeWhenI 🇻🇦 818 213 132ms 1 Dec 2024 158th emgordon154 818 328 1,708ms 22 Dec 2025 159th MeWhenI 🇻🇦 818 464 28ms 9 May 2025 160th Shanethegamer 🇺🇸 816 176 64ms 6 Dec 2024 First Prev 81–160 of 509 Next Last