The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Kaprekar Numbers 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 881st KatieLG 🇬🇧 147 563 1,373ms 1 Nov 2024 882nd KatieLG 🇬🇧 146 466 158ms 30 Nov 2025 883rd KatieLG 🇬🇧 146 538 491ms 1 Nov 2024 884th JunkIce 145 449 640ms 3 Dec 2024 885th Maznek 144 364 10ms 8 Nov 2024 885th elisherer 🇮🇱 144 364 10ms 3 Nov 2025 887th HumanoidCPU 144 452 348ms 1 Nov 2024 887th Shanethegamer 🇺🇸 144 452 367ms 1 Nov 2024 887th JOrE20 144 452 353ms 2 Feb 2026 890th HumanoidCPU 144 461 112ms 1 Nov 2024 890th KatieLG 🇬🇧 144 461 118ms 1 Nov 2024 890th Shanethegamer 🇺🇸 144 461 123ms 1 Nov 2024 890th MeWhenI 🇻🇦 144 461 110ms 2 Nov 2024 890th CaedenHarper 🇨🇦 144 461 110ms 24 Jan 2025 895th KatieLG 🇬🇧 143 469 5ms 30 Nov 2025 896th KatieLG-Transpiler 🇬🇧 143 528 379ms 9 Jan 2026 897th HumanoidCPU 141 446 72ms 1 Nov 2024 897th Shanethegamer 🇺🇸 141 446 72ms 1 Nov 2024 897th MeWhenI 🇻🇦 141 446 75ms 2 Nov 2024 897th snoozingnewt 🇨🇦 141 446 74ms 3 Nov 2024 897th CaedenHarper 🇨🇦 141 446 73ms 16 Aug 2025 902nd KatieLG-Transpiler 🇬🇧 140 564 148ms 9 Jan 2026 903rd dokutan 139 452 84ms 1 Nov 2024 904th KatieLG 🇬🇧 138 505 1,014ms 30 Nov 2025 905th emgordon154 138 602 2,195ms 12 Dec 2024 906th HumanoidCPU 137 575 41ms 9 Mar 2025 907th KatieLG 🇬🇧 135 465 73ms 30 Nov 2025 908th dokutan 134 473 1ms 1 Nov 2024 909th KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 910th dokutan 133 591 38ms 1 Nov 2024 911th KatieLG-Transpiler 🇬🇧 132 505 114ms 9 Jan 2026 912th KatieLG-Transpiler 🇬🇧 132 515 139ms 9 Jan 2026 913th KatieLG-Transpiler 🇬🇧 132 519 9ms 9 Jan 2026 914th KatieLG 🇬🇧 131 443 3ms 30 Nov 2025 915th HumanoidCPU 131 444 2ms 1 Nov 2024 915th Shanethegamer 🇺🇸 131 444 2ms 1 Nov 2024 915th dokutan 131 444 3ms 1 Nov 2024 915th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 915th CaedenHarper 🇨🇦 131 444 3ms 16 Aug 2025 915th JRaspass 🇬🇧 131 444 3ms 3 days ago 921st KatieLG-Transpiler 🇬🇧 131 446 3ms 9 Jan 2026 922nd dokutan 131 483 1ms 21 Jun 2025 923rd KatieLG-Transpiler 🇬🇧 131 512 4ms 9 Jan 2026 924th KatieLG-Transpiler 🇬🇧 131 533 656ms 9 Jan 2026 925th KatieLG 🇬🇧 130 487 1ms 30 Nov 2025 926th KatieLG 🇬🇧 130 515 2ms 8 Jan 2025 926th KatieLG-Transpiler 🇬🇧 130 515 1ms 9 Jan 2026 928th KatieLG-Transpiler 🇬🇧 128 528 1ms 9 Jan 2026 929th sciencejiho 127 532 2ms 12 Feb 2025 930th KatieLG-Transpiler 🇬🇧 125 519 380ms 9 Jan 2026 931st HumanoidCPU 123 446 1,278ms 1 Nov 2024 931st Shanethegamer 🇺🇸 123 446 1,285ms 1 Nov 2024 931st dokutan 123 446 1,302ms 1 Nov 2024 931st CaedenHarper 🇨🇦 123 446 1,311ms 24 Jan 2025 935th MeWhenI 🇻🇦 123 515 1ms 2 Nov 2024 935th CaedenHarper 🇨🇦 123 515 1ms 12 Nov 2025 935th Shanethegamer 🇺🇸 123 515 1ms 12 Nov 2025 935th HumanoidCPU 123 515 1ms 12 Nov 2025 939th KatieLG-Transpiler 🇬🇧 122 517 73ms 9 Jan 2026 940th HumanoidCPU 122 518 1ms 1 Nov 2024 940th Shanethegamer 🇺🇸 122 518 1ms 1 Nov 2024 940th MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 940th CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 944th KatieLG-Transpiler 🇬🇧 122 519 1ms 9 Jan 2026 945th KatieLG-Transpiler 🇬🇧 121 525 1ms 9 Jan 2026 946th dokutan 120 439 33ms 21 Apr 2025 946th olleicua 🇺🇸 120 439 35ms 12 Jun 2025 948th HumanoidCPU 119 445 35ms 1 Nov 2024 948th Shanethegamer 🇺🇸 119 445 38ms 1 Nov 2024 948th CaedenHarper 🇨🇦 119 445 34ms 16 Aug 2025 951st Shanethegamer 🇺🇸 119 453 125ms 1 Nov 2024 951st KatieLG 🇬🇧 119 453 150ms 1 Nov 2024 951st MeWhenI 🇻🇦 119 453 128ms 2 Nov 2024 951st CaedenHarper 🇨🇦 119 453 135ms 24 Jan 2025 955th KatieLG 🇬🇧 119 461 1,221ms 30 Nov 2025 956th HumanoidCPU 118 446 9ms 1 Nov 2024 956th dokutan 118 446 9ms 1 Nov 2024 956th MeWhenI 🇻🇦 118 446 9ms 2 Nov 2024 956th zakariamouhid 118 446 9ms 17 Nov 2024 956th Salutations45 118 446 10ms 22 Nov 2024 First Prev 881–960 of 1,113 Next Last
