Card Number Validation 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 Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 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 ArkScript 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 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 ArkScript 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 Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 801st iczelia 🇩🇪 462 94 2ms 23 Sep 2025 802nd Jacob385 462 202 418ms 2 Oct 2024 803rd navier-1 461 173 10ms 22 Sep 2025 804th madex 🇩🇪 460 104 37ms 2 Oct 2024 805th TheZwierzLF 🇵🇱 456 105 38ms 8 Jan 2026 806th snoozingnewt 🇨🇦 455 149 4ms 2 Nov 2025 807th IISResetMe 453 103 486ms 27 Nov 2025 808th clayboll99 453 176 10ms 10 Jul 2025 809th snoozingnewt 🇨🇦 452 96 2ms 2 Nov 2025 810th dokutan 451 63 3ms 26 Nov 2024 811th snoozingnewt 🇨🇦 451 176 2ms 2 Nov 2025 812th muser-logiccpu 🇺🇦 450 177 18ms 9 Aug 2025 813th OSYCh314 🇦🇺 448 178 10ms 2 Nov 2024 814th dokutan 445 109 10ms 19 Oct 2024 815th grey0ut 444 105 472ms 11 Jan 2025 816th calum12345 443 180 10ms 26 Mar 2025 817th Yewzir 🇧🇪 442 171 13ms 26 Dec 2024 818th MyXoToD 🇩🇪 441 146 10ms 26 May 2025 819th CheeseCake628 🇳🇴 439 151 521ms 18 Oct 2025 820th zt14427 438 182 11ms 27 Dec 2024 821st IoLimmer 436 183 10ms 10 Oct 2024 822nd varhammer 435 223 11ms 23 Feb 2025 823rd KatieLG 🇬🇧 433 183 2ms 2 Oct 2025 824th KatieLG 🇬🇧 431 108 6ms 13 Oct 2024 825th snoozingnewt 🇨🇦 431 111 38ms 2 Nov 2025 826th estomagordo 🇳🇱 429 186 10ms 15 Jul 2025 827th dokutan 426 132 301ms 3 Oct 2024 828th JOrE20 424 136 1,020ms 7 Dec 2025 829th MeWhenI 🇻🇦 424 143 6ms 2 Oct 2024 830th Arkadios200 417 196 103ms 21 Oct 2025 831st aksyristos 411 172 2ms 23 Nov 2025 832nd snoozingnewt 🇨🇦 411 267 29ms 18 Dec 2025 833rd Mabeloid 🇳🇴 405 159 10ms 12 Oct 2024 834th snoozingnewt 🇨🇦 404 223 96ms 2 Nov 2025 835th Ralac07 🇦🇺 398 162 11ms 3 Oct 2024 836th dieggsy 393 247 18ms 10 Oct 2024 837th snoozingnewt 🇨🇦 392 276 40ms 6 Dec 2025 838th snoozingnewt 🇨🇦 388 313 40ms 2 Nov 2025 839th fischfood 385 176 4ms 22 Oct 2024 840th JOrE20 385 191 188ms 27 Jan 2026 841st ehulinsky 🇺🇸 384 158 5ms 2 Apr 2025 842nd c0d3-4-F00d 🇩🇪 384 184 2ms 9 Jan 2025 843rd KatieLG 🇬🇧 375 218 110ms 21 Nov 2025 844th RobGLambert 375 232 1,453ms 8 Jun 2025 845th RedzGoose 🇦🇺 371 187 158ms 2 Oct 2024 846th P1nk-P0nk 369 215 3ms 18 Oct 2024 847th gautambp 366 218 11ms 24 Jun 2025 848th snoozingnewt 🇨🇦 363 267 13ms 2 Nov 2025 849th denkyuu1 361 156 603ms 3 days ago 850th sciencejiho 358 197 2ms 11 Feb 2025 851st The-Wolfson 355 230 102ms 16 Dec 2024 852nd Zhenyu-Bo 350 228 11ms 30 Jul 2025 853rd EthanJantz 347 230 11ms 5 Sep 2025 854th RobGLambert 342 273 200ms 8 Jun 2025 855th Ernest1338 340 275 303ms 26 Oct 2024 856th noahhorlacher 337 191 9ms 7 Dec 2024 857th RobertBurs 336 237 10ms 22 Sep 2025 858th TJK-S 331 241 11ms 25 Oct 2025 858th NoneTheFewer 331 241 11ms 25 Dec 2025 860th JOrE20 314 389 56ms 4 Dec 2025 861st te-chnical 309 258 219ms 4 May 2025 862nd snoozingnewt 🇨🇦 303 200 4ms 2 Nov 2025 863rd KatieLG 🇬🇧 300 290 2,579ms 1 Oct 2025 864th kasarino 294 240 2ms 8 Feb 2026 865th KatieLG 🇬🇧 293 241 2ms 1 Oct 2025 866th fantaize 283 330 198ms 2 days ago 867th ReterikHub 280 310 217ms 17 Jan 2025 868th Mikey-Beep 🇬🇧 273 349 17ms 12 Aug 2025 869th MeWhenI 🇻🇦 272 407 119ms 6 Oct 2024 870th arebbsba 269 296 11ms 9 Jan 2025 871st kasarino 267 299 11ms 8 Feb 2026 872nd kasarino 258 373 44ms 8 Feb 2026 873rd benanlam 249 320 10ms 21 Dec 2025 874th Msleizak 🇫🇷 206 226 280ms 19 May 2025 875th theEsteemed 154 606 472ms 20 Jan 2026 876th AidanWalter 148 540 10ms 1 Jan 2025 877th bignamehyp 120 667 10ms 14 Nov 2024 878th vkptimon 120 776 422ms 9 Jul 2025 879th dokutan 61 2,475 116ms 18 Aug 2025 880th iczelia 🇩🇪 52 2,045 4ms 14 Oct 2025 First Prev 801–880 of 911 Next Last