Card Number Validation in all languages in bytes. Cheevos Holes Recent Holes Langs Medals Misc 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Erlang Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Erlang Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions 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 Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Tower of Hanoi Turtle Tutorial # Golfer Points Bytes Time Submitted 751st CheeseCake628 🇳🇴 438 151 453ms 18 Oct 2025 752nd zt14427 438 182 11ms 27 Dec 2024 753rd IoLimmer 435 183 11ms 10 Oct 2024 754th KatieLG 🇬🇧 433 183 2ms 2 Oct 2025 755th aksyristos 433 184 16ms 15 Nov 2024 756th KatieLG 🇬🇧 431 108 7ms 13 Oct 2024 757th snoozingnewt 🇺🇸 430 111 36ms 20 days ago 758th estomagordo 🇳🇱 428 186 10ms 15 Jul 2025 759th snoozingnewt 🇺🇸 426 268 28ms 20 days ago 760th dokutan 425 132 291ms 3 Oct 2024 761st MeWhenI 🇻🇦 424 143 6ms 2 Oct 2024 762nd Arkadios200 417 196 95ms 21 Oct 2025 763rd aksyristos 408 172 2ms 97 mins ago 764th dieggsy 406 247 21ms 10 Oct 2024 765th snoozingnewt 🇺🇸 406 313 45ms 20 days ago 766th Mabeloid 🇳🇴 405 159 10ms 12 Oct 2024 767th snoozingnewt 🇺🇸 404 223 83ms 20 days ago 768th Ralac07 🇦🇺 397 162 10ms 3 Oct 2024 769th ehulinsky 🇺🇸 384 158 5ms 2 Apr 2025 770th fischfood 384 176 5ms 22 Oct 2024 771st c0d3-4-F00d 🇩🇪 382 184 2ms 9 Jan 2025 772nd snoozingnewt 🇺🇸 379 286 41ms 20 days ago 773rd snoozingnewt 🇺🇸 376 267 13ms 20 days ago 774th KatieLG 🇬🇧 375 218 112ms 44 hours ago 775th RobGLambert 370 232 915ms 8 Jun 2025 776th RedzGoose 🇦🇺 369 187 102ms 2 Oct 2024 777th P1nk-P0nk 369 215 3ms 18 Oct 2024 778th gautambp 365 218 10ms 24 Jun 2025 779th sciencejiho 356 197 2ms 11 Feb 2025 780th The-Wolfson 355 230 101ms 16 Dec 2024 781st Zhenyu-Bo 349 228 14ms 30 Jul 2025 782nd EthanJantz 346 230 10ms 5 Sep 2025 783rd RobGLambert 341 273 200ms 8 Jun 2025 784th Ernest1338 339 275 275ms 26 Oct 2024 785th noahhorlacher 337 191 10ms 7 Dec 2024 786th RobertBurs 336 237 10ms 22 Sep 2025 787th TJK-S 330 241 9ms 25 Oct 2025 788th te-chnical 309 258 193ms 4 May 2025 789th snoozingnewt 🇺🇸 303 200 3ms 20 days ago 790th KatieLG 🇬🇧 296 290 1,806ms 1 Oct 2025 791st KatieLG 🇬🇧 291 241 2ms 1 Oct 2025 792nd ReterikHub 277 310 205ms 17 Jan 2025 793rd Mikey-Beep 🇬🇧 273 349 25ms 12 Aug 2025 794th MeWhenI 🇻🇦 271 407 132ms 6 Oct 2024 795th arebbsba 269 296 12ms 9 Jan 2025 796th Msleizak 🇫🇷 206 226 243ms 19 May 2025 797th AidanWalter 147 540 9ms 1 Jan 2025 798th vkptimon 120 776 307ms 9 Jul 2025 799th bignamehyp 119 667 9ms 14 Nov 2024 800th dokutan 61 2,475 124ms 18 Aug 2025 801st iczelia 🇩🇪 52 2,045 4ms 14 Oct 2025 802nd lyphyser 0 15 80ms 25 May 2025 803rd 2bular 0 16 76ms 22 Mar 2025 804th darrenks 0 17 78ms 22 Mar 2025 805th Natanaelel 🇸🇪 0 18 74ms 23 Mar 2025 806th plcc0 0 21 99ms 4 Apr 2025 806th namelessiw 0 21 150ms 3 days ago 808th kg583 🇺🇸 0 25 266ms 8 Feb 2025 809th lyxal 🇦🇺 0 27 494ms 17 May 2025 810th themoonisacheese 0 35 484ms 13 Jun 2025 811th ovs-code 🇩🇪 0 54 4ms 9 Jul 2025 812th GrayJoKing 🇦🇺 0 55 3ms 13 Jul 2025 813th ovs-code 🇩🇪 0 58 3ms 13 Jul 2025 814th AlephSquirrel 0 63 3ms 15 Jun 2025 815th DialFrost 🇸🇬 0 67 11ms 13 Feb 2025 816th chunes3 🇺🇸 0 69 6ms 13 Feb 2025 817th maweowo 🇩🇪 0 70 4ms 2 Oct 2025 818th evnu 0 73 5ms 12 Oct 2025 819th ovs-code 🇩🇪 0 76 15ms 13 Jun 2025 820th sean-niemann 🇺🇸 0 80 69ms 29 Apr 2025 821st albanian-laundromat 0 123 2ms 4 Jun 2025 822nd edsrzf 🇳🇿 0 142 216ms 24 Jul 2025 823rd MatthewF19 0 192 119ms 17 May 2025 824th dokutan 0 219 65ms 28 Jun 2025 First Prev 751–824 of 824