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 800th denkyuu1 460 104 35ms 14 days ago 802nd TheZwierzLF 🇵🇱 456 105 38ms 8 Jan 2026 803rd snoozingnewt 🇨🇦 455 149 4ms 2 Nov 2025 804th IISResetMe 453 103 486ms 27 Nov 2025 805th clayboll99 453 176 10ms 10 Jul 2025 806th snoozingnewt 🇨🇦 452 96 2ms 2 Nov 2025 807th dokutan 451 63 3ms 26 Nov 2024 808th snoozingnewt 🇨🇦 451 176 2ms 2 Nov 2025 809th muser-logiccpu 🇺🇦 450 177 18ms 9 Aug 2025 810th OSYCh314 🇦🇺 448 178 10ms 2 Nov 2024 811th dokutan 445 109 10ms 19 Oct 2024 812th grey0ut 444 105 472ms 11 Jan 2025 813th calum12345 443 180 10ms 26 Mar 2025 814th Yewzir 🇧🇪 442 171 13ms 26 Dec 2024 815th MyXoToD 🇩🇪 441 146 13ms 26 May 2025 816th CheeseCake628 🇳🇴 439 151 521ms 18 Oct 2025 817th zt14427 438 182 11ms 27 Dec 2024 818th IoLimmer 436 183 10ms 10 Oct 2024 819th varhammer 435 223 11ms 23 Feb 2025 820th KatieLG 🇬🇧 433 183 2ms 2 Oct 2025 821st KatieLG 🇬🇧 431 108 6ms 13 Oct 2024 822nd snoozingnewt 🇨🇦 431 111 38ms 2 Nov 2025 823rd estomagordo 🇳🇱 429 186 10ms 15 Jul 2025 824th dokutan 425 132 301ms 3 Oct 2024 825th JOrE20 424 136 1,020ms 7 Dec 2025 826th MeWhenI 🇻🇦 424 143 6ms 2 Oct 2024 827th Arkadios200 417 196 103ms 21 Oct 2025 828th aksyristos 411 172 2ms 23 Nov 2025 829th snoozingnewt 🇨🇦 411 267 29ms 18 Dec 2025 830th Mabeloid 🇳🇴 405 159 11ms 12 Oct 2024 831st snoozingnewt 🇨🇦 404 223 96ms 2 Nov 2025 832nd Ralac07 🇦🇺 398 162 11ms 3 Oct 2024 833rd dieggsy 393 247 18ms 10 Oct 2024 834th snoozingnewt 🇨🇦 392 276 40ms 6 Dec 2025 835th snoozingnewt 🇨🇦 388 313 40ms 2 Nov 2025 836th fischfood 385 176 4ms 22 Oct 2024 837th JOrE20 385 191 188ms 27 Jan 2026 838th ehulinsky 🇺🇸 384 158 5ms 2 Apr 2025 839th c0d3-4-F00d 🇩🇪 384 184 2ms 9 Jan 2025 840th KatieLG 🇬🇧 375 218 110ms 21 Nov 2025 841st RobGLambert 375 232 1,323ms 8 Jun 2025 842nd RedzGoose 🇦🇺 371 187 158ms 2 Oct 2024 843rd P1nk-P0nk 369 215 3ms 18 Oct 2024 844th gautambp 366 218 11ms 24 Jun 2025 845th snoozingnewt 🇨🇦 363 267 13ms 2 Nov 2025 846th sciencejiho 358 197 2ms 11 Feb 2025 847th The-Wolfson 355 230 102ms 16 Dec 2024 848th Zhenyu-Bo 350 228 11ms 30 Jul 2025 849th EthanJantz 347 230 11ms 5 Sep 2025 850th RobGLambert 342 273 200ms 8 Jun 2025 851st Ernest1338 339 275 303ms 26 Oct 2024 852nd noahhorlacher 337 191 9ms 7 Dec 2024 853rd RobertBurs 336 237 10ms 22 Sep 2025 854th TJK-S 331 241 11ms 25 Oct 2025 854th NoneTheFewer 331 241 11ms 25 Dec 2025 856th JOrE20 314 389 56ms 4 Dec 2025 857th te-chnical 309 258 219ms 4 May 2025 858th snoozingnewt 🇨🇦 303 200 4ms 2 Nov 2025 859th KatieLG 🇬🇧 300 290 2,497ms 1 Oct 2025 860th kasarino 294 240 2ms 8 Feb 2026 861st KatieLG 🇬🇧 293 241 2ms 1 Oct 2025 862nd ReterikHub 280 310 205ms 17 Jan 2025 863rd Mikey-Beep 🇬🇧 273 349 17ms 12 Aug 2025 864th MeWhenI 🇻🇦 272 407 119ms 6 Oct 2024 865th arebbsba 269 296 11ms 9 Jan 2025 866th kasarino 267 299 11ms 8 Feb 2026 867th kasarino 258 373 44ms 8 Feb 2026 868th benanlam 249 320 10ms 21 Dec 2025 869th Msleizak 🇫🇷 206 226 280ms 19 May 2025 870th theEsteemed 154 606 472ms 20 Jan 2026 871st AidanWalter 148 540 10ms 1 Jan 2025 872nd bignamehyp 120 667 10ms 14 Nov 2024 873rd vkptimon 120 776 422ms 9 Jul 2025 874th dokutan 61 2,475 116ms 18 Aug 2025 875th iczelia 🇩🇪 52 2,045 4ms 14 Oct 2025 876th lyphyser 0 15 33ms 25 May 2025 876th 2bular 0 15 32ms 23 days ago 876th Natanaelel 🇸🇪 0 15 35ms 20 days ago 879th darrenks 🇺🇸 0 16 33ms 23 days ago 880th plcc0 0 18 35ms 23 days ago First Prev 801–880 of 906 Next Last