The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Kaprekar Numbers in all languages in chars. 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 Chars Time Submitted 879th MeWhenI 🇻🇦 141 446 75ms 2 Nov 2024 879th CaedenHarper 🇨🇦 141 446 73ms 16 Aug 2025 883rd KatieLG-Transpiler 🇬🇧 140 564 148ms 9 Jan 2026 884th KatieLG 🇬🇧 138 505 640ms 30 Nov 2025 885th emgordon154 138 602 2,195ms 12 Dec 2024 886th denkyuu1 137 346 34ms 18 days ago 887th HumanoidCPU 137 575 41ms 9 Mar 2025 888th dokutan 136 273 3ms 13 Nov 2024 889th KatieLG 🇬🇧 135 465 73ms 30 Nov 2025 890th dokutan 134 473 1ms 1 Nov 2024 891st KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 892nd KatieLG-Transpiler 🇬🇧 132 505 114ms 9 Jan 2026 893rd KatieLG-Transpiler 🇬🇧 132 515 139ms 9 Jan 2026 894th KatieLG 🇬🇧 131 443 3ms 30 Nov 2025 895th HumanoidCPU 131 444 2ms 1 Nov 2024 895th Shanethegamer 🇺🇸 131 444 2ms 1 Nov 2024 895th dokutan 131 444 3ms 1 Nov 2024 895th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 895th CaedenHarper 🇨🇦 131 444 3ms 16 Aug 2025 895th JRaspass 🇬🇧 131 444 3ms 8 hours ago 901st KatieLG-Transpiler 🇬🇧 131 446 3ms 9 Jan 2026 902nd GolfingSuccess 🇬🇷 131 452 10ms 1 Nov 2024 902nd zbreit 🇺🇸 131 452 10ms 1 Nov 2024 902nd Shanethegamer 🇺🇸 131 452 10ms 1 Nov 2024 902nd madex 🇩🇪 131 452 10ms 1 Nov 2024 902nd jtaxen 131 452 10ms 1 Nov 2024 902nd Stockoh 🇫🇷 131 452 9ms 4 Nov 2024 902nd evan18c 131 452 10ms 7 Nov 2024 902nd roguh 🇬🇹 131 452 9ms 27 Nov 2024 902nd mathisfun271 131 452 10ms 25 Jan 2025 902nd moustave 131 452 10ms 9 Apr 2025 902nd SectorCorruptor 131 452 10ms 24 Jul 2025 902nd vgamula 🇺🇦 131 452 11ms 25 Jul 2025 902nd Unknownuserfrommars 131 452 10ms 5 Aug 2025 902nd JOrE20 131 452 10ms 6 Nov 2025 902nd TheSecondComing123 131 452 10ms 27 days ago 917th KatieLG-Transpiler 🇬🇧 131 512 4ms 9 Jan 2026 918th KatieLG-Transpiler 🇬🇧 131 533 648ms 9 Jan 2026 919th KasperKivimaeki 🇫🇮 130 457 10ms 15 Jul 2025 920th KatieLG 🇬🇧 130 487 1ms 30 Nov 2025 921st KatieLG 🇬🇧 130 515 2ms 8 Jan 2025 921st KatieLG-Transpiler 🇬🇧 130 515 1ms 9 Jan 2026 923rd muser-logiccpu 🇺🇦 129 458 9ms 9 Aug 2025 923rd netfri25 🇮🇱 129 458 10ms 21 Feb 2026 923rd rotemkm 129 458 10ms 21 Feb 2026 926th Shanethegamer 🇺🇸 126 452 367ms 1 Nov 2024 926th JOrE20 126 452 353ms 2 Feb 2026 928th KatieLG-Transpiler 🇬🇧 126 528 1ms 9 Jan 2026 929th sciencejiho 125 532 2ms 12 Feb 2025 930th HumanoidCPU 123 446 1,278ms 1 Nov 2024 930th Shanethegamer 🇺🇸 123 446 1,285ms 1 Nov 2024 930th dokutan 123 446 1,302ms 1 Nov 2024 930th CaedenHarper 🇨🇦 123 446 1,311ms 24 Jan 2025 934th MeWhenI 🇻🇦 123 515 1ms 2 Nov 2024 934th CaedenHarper 🇨🇦 123 515 1ms 12 Nov 2025 934th Shanethegamer 🇺🇸 123 515 1ms 12 Nov 2025 934th HumanoidCPU 123 515 1ms 12 Nov 2025 938th KatieLG-Transpiler 🇬🇧 122 517 73ms 9 Jan 2026 939th HumanoidCPU 122 518 1ms 1 Nov 2024 939th Shanethegamer 🇺🇸 122 518 1ms 1 Nov 2024 939th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 939th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 943rd KatieLG-Transpiler 🇬🇧 122 519 1ms 9 Jan 2026 944th KatieLG-Transpiler 🇬🇧 121 525 1ms 9 Jan 2026 945th KatieLG 🇬🇧 119 461 1,221ms 30 Nov 2025 946th HumanoidCPU 118 446 10ms 1 Nov 2024 946th MeWhenI 🇻🇦 118 446 8ms 2 Nov 2024 946th zakariamouhid 118 446 8ms 17 Nov 2024 946th Salutations45 118 446 9ms 22 Nov 2024 946th gigaprofisi 🇺🇸 118 446 9ms 20 Jun 2025 946th didion0 🇺🇸 118 446 9ms 26 Aug 2025 946th olleicua 🇺🇸 118 446 11ms 10 Sep 2025 953rd iczelia 🇩🇪 117 447 9ms 24 Oct 2025 954th Quadruplay 117 448 9ms 12 Jul 2025 955th KatieLG-Transpiler 🇬🇧 115 455 10ms 9 Jan 2026 956th KatieLG-Transpiler 🇬🇧 114 519 9ms 9 Jan 2026 957th HumanoidCPU 113 448 156ms 1 Nov 2024 957th MeWhenI 🇻🇦 113 448 153ms 2 Nov 2024 957th CaedenHarper 🇨🇦 113 448 162ms 1 Feb 2025 960th Shanethegamer 🇺🇸 110 453 125ms 1 Nov 2024 First Prev 881–960 of 1,102 Next Last
