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 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 881st HumanoidCPU 141 446 72ms 1 Nov 2024 881st Shanethegamer 🇺🇸 141 446 72ms 1 Nov 2024 881st MeWhenI 🇻🇦 141 446 75ms 2 Nov 2024 881st CaedenHarper 🇨🇦 141 446 73ms 16 Aug 2025 885th KatieLG-Transpiler 🇬🇧 140 564 148ms 9 Jan 2026 886th KatieLG 🇬🇧 138 505 1,014ms 30 Nov 2025 887th emgordon154 138 602 2,195ms 12 Dec 2024 888th denkyuu1 137 346 34ms 21 days ago 889th HumanoidCPU 137 575 41ms 9 Mar 2025 890th dokutan 136 273 3ms 13 Nov 2024 891st KatieLG 🇬🇧 135 465 73ms 30 Nov 2025 892nd dokutan 134 473 1ms 1 Nov 2024 893rd KatieLG 🇬🇧 133 475 1ms 1 Nov 2024 894th KatieLG-Transpiler 🇬🇧 132 505 114ms 9 Jan 2026 895th KatieLG-Transpiler 🇬🇧 132 515 139ms 9 Jan 2026 896th KatieLG 🇬🇧 131 443 3ms 30 Nov 2025 897th HumanoidCPU 131 444 2ms 1 Nov 2024 897th Shanethegamer 🇺🇸 131 444 2ms 1 Nov 2024 897th dokutan 131 444 3ms 1 Nov 2024 897th MeWhenI 🇻🇦 131 444 2ms 2 Nov 2024 897th CaedenHarper 🇨🇦 131 444 3ms 16 Aug 2025 897th JRaspass 🇬🇧 131 444 3ms 2 days ago 903rd KatieLG-Transpiler 🇬🇧 131 446 3ms 9 Jan 2026 904th GolfingSuccess 🇬🇷 131 452 10ms 1 Nov 2024 904th zbreit 🇺🇸 131 452 10ms 1 Nov 2024 904th Shanethegamer 🇺🇸 131 452 10ms 1 Nov 2024 904th madex 🇩🇪 131 452 10ms 1 Nov 2024 904th jtaxen 131 452 10ms 1 Nov 2024 904th Stockoh 🇫🇷 131 452 9ms 4 Nov 2024 904th evan18c 131 452 10ms 7 Nov 2024 904th roguh 🇬🇹 131 452 9ms 27 Nov 2024 904th mathisfun271 131 452 10ms 25 Jan 2025 904th moustave 131 452 10ms 9 Apr 2025 904th SectorCorruptor 131 452 10ms 24 Jul 2025 904th vgamula 🇺🇦 131 452 11ms 25 Jul 2025 904th Unknownuserfrommars 131 452 10ms 5 Aug 2025 904th JOrE20 131 452 10ms 6 Nov 2025 904th TheSecondComing123 131 452 10ms 25 Feb 2026 919th KatieLG-Transpiler 🇬🇧 131 512 4ms 9 Jan 2026 920th KatieLG-Transpiler 🇬🇧 131 533 656ms 9 Jan 2026 921st KasperKivimaeki 🇫🇮 130 457 10ms 15 Jul 2025 922nd KatieLG 🇬🇧 130 487 1ms 30 Nov 2025 923rd KatieLG 🇬🇧 130 515 2ms 8 Jan 2025 923rd KatieLG-Transpiler 🇬🇧 130 515 1ms 9 Jan 2026 925th muser-logiccpu 🇺🇦 129 458 9ms 9 Aug 2025 925th netfri25 🇮🇱 129 458 10ms 21 Feb 2026 925th rotemkm 129 458 10ms 21 Feb 2026 928th Shanethegamer 🇺🇸 126 452 367ms 1 Nov 2024 928th JOrE20 126 452 353ms 2 Feb 2026 930th KatieLG-Transpiler 🇬🇧 126 528 1ms 9 Jan 2026 931st sciencejiho 125 532 2ms 12 Feb 2025 932nd HumanoidCPU 123 446 1,278ms 1 Nov 2024 932nd Shanethegamer 🇺🇸 123 446 1,285ms 1 Nov 2024 932nd dokutan 123 446 1,302ms 1 Nov 2024 932nd CaedenHarper 🇨🇦 123 446 1,311ms 24 Jan 2025 936th MeWhenI 🇻🇦 123 515 1ms 2 Nov 2024 936th CaedenHarper 🇨🇦 123 515 1ms 12 Nov 2025 936th Shanethegamer 🇺🇸 123 515 1ms 12 Nov 2025 936th HumanoidCPU 123 515 1ms 12 Nov 2025 940th KatieLG-Transpiler 🇬🇧 122 517 73ms 9 Jan 2026 941st HumanoidCPU 122 518 1ms 1 Nov 2024 941st Shanethegamer 🇺🇸 122 518 1ms 1 Nov 2024 941st MeWhenI 🇻🇦 122 518 2ms 2 Nov 2024 941st CaedenHarper 🇨🇦 122 518 1ms 22 Jan 2025 945th KatieLG-Transpiler 🇬🇧 122 519 1ms 9 Jan 2026 946th KatieLG-Transpiler 🇬🇧 121 525 1ms 9 Jan 2026 947th KatieLG 🇬🇧 119 461 1,221ms 30 Nov 2025 948th HumanoidCPU 118 446 9ms 1 Nov 2024 948th MeWhenI 🇻🇦 118 446 9ms 2 Nov 2024 948th zakariamouhid 118 446 9ms 17 Nov 2024 948th Salutations45 118 446 10ms 22 Nov 2024 948th gigaprofisi 🇺🇸 118 446 10ms 20 Jun 2025 948th didion0 🇺🇸 118 446 12ms 26 Aug 2025 948th olleicua 🇺🇸 118 446 11ms 10 Sep 2025 955th iczelia 🇩🇪 117 447 10ms 24 Oct 2025 956th Quadruplay 117 448 11ms 12 Jul 2025 957th KatieLG-Transpiler 🇬🇧 115 455 9ms 9 Jan 2026 958th KatieLG-Transpiler 🇬🇧 114 519 9ms 9 Jan 2026 959th HumanoidCPU 113 448 156ms 1 Nov 2024 959th MeWhenI 🇻🇦 113 448 153ms 2 Nov 2024 First Prev 881–960 of 1,104 Next Last
