The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Christmas Trees 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 emgordon154 723 166 1,697ms 26 Mar 2025 882nd user189032 722 94 13ms 29 May 2019 882nd sebipopa 🇷🇴 722 94 9ms 16 Sep 2022 882nd stefangabos 🇷🇴 722 94 10ms 16 Sep 2022 882nd 823126 722 94 12ms 15 Nov 2024 882nd a6166231 🇨🇳 722 94 12ms 15 May 2025 887th Herbert00709 🇵🇱 722 129 61ms 20 Apr 2024 888th brianlwatson 721 63 36ms 9 Dec 2020 888th Waffle3z 721 63 35ms 21 Jan 2021 888th NewDefectus 🇮🇱 721 63 36ms 10 Feb 2021 888th emgordon154 721 63 35ms 17 Nov 2024 888th olleicua 🇺🇸 721 63 35ms 13 Jun 2025 893rd Shanethegamer 🇺🇸 721 98 1,306ms 18 Jun 2024 894th MeWhenI 🇻🇦 720 101 7ms 9 May 2024 895th sean-niemann 🇺🇸 720 102 2ms 6 Jan 2026 896th EnigmaticError 720 104 1ms 27 Jan 2024 897th MeWhenI 🇻🇦 719 85 2ms 13 Oct 2023 898th CaedenHarper 🇨🇦 719 124 495ms 4 Oct 2025 899th bbakersmith 718 65 3ms 13 Jul 2021 899th armin-k1 718 65 3ms 10 Sep 2021 901st Sakaala 718 74 9ms 24 Apr 2019 901st rzana 718 74 9ms 14 Dec 2020 901st RYNO8 718 74 10ms 26 Aug 2021 901st Sloimayyy 718 74 10ms 22 Aug 2022 901st shelerr 718 74 10ms 8 Sep 2022 901st CarsonChr 🇺🇸 718 74 11ms 18 Sep 2022 901st Eilonlif 🇮🇱 718 74 9ms 7 Apr 2023 901st WillConker 718 74 10ms 16 Jul 2023 901st wyarde 718 74 10ms 7 Nov 2023 901st chartung17 718 74 10ms 10 Dec 2023 901st sultan 718 74 11ms 9 Mar 2024 901st zaki1993 718 74 9ms 28 May 2024 901st YAJUE114514 718 74 10ms 30 Jul 2025 901st Lv0Sys 🇵🇱 718 74 10ms 20 Feb 2026 915th dokutan 718 100 2,462ms 15 Dec 2025 916th mousetail 🇳🇱 718 116 152ms 19 Jan 2024 917th Seek64 🇩🇪 718 141 1ms 1 Oct 2024 918th CheeseCake628 🇳🇴 717 70 418ms 17 Jan 2024 919th dokutan 717 93 2ms 26 Jul 2024 920th destofr 717 106 130ms 19 Dec 2022 921st solmyr2000 717 130 66ms 18 Jun 2022 921st kkoenig 717 130 445ms 23 Dec 2023 921st MateuszPietrzak 🇵🇱 717 130 443ms 27 Dec 2023 924th Natanaelel 🇸🇪 716 46 2ms 20 Jul 2023 925th Yewzir 🇧🇪 715 70 457ms 26 Feb 2024 925th Ripick 715 70 228ms 24 Jun 2025 925th Lv0Sys 🇵🇱 715 70 465ms 30 Nov 2025 928th nmandel 714 95 10ms 21 Dec 2018 928th zbreit 🇺🇸 714 95 10ms 6 Aug 2020 928th dzshn 714 95 10ms 7 Apr 2021 928th inventshah 714 95 11ms 8 May 2021 928th GeorgeStechman 🇬🇧 714 95 12ms 16 Sep 2022 928th weliveinhell 🇭🇹 714 95 10ms 20 Dec 2023 928th madeforlosers 714 95 9ms 3 Nov 2025 935th MeWhenI 🇻🇦 714 105 4ms 22 May 2023 935th Andriamanitra 🇫🇮 714 105 4ms 24 Dec 2024 937th SteveL-MSFT 713 66 266ms 6 Jun 2020 938th bac0id 713 103 2ms 28 Jan 2026 939th angel-p57 🇯🇵 713 142 1ms 27 Nov 2023 940th edsrzf 🇳🇿 712 102 7ms 17 Nov 2025 941st stefangimmillaro 712 116 383ms 17 Oct 2022 942nd nipzu 712 117 129ms 4 Jan 2020 943rd edsrzf 🇳🇿 711 117 106ms 3 Dec 2025 944th Yewzir 🇧🇪 711 131 430ms 9 Feb 2024 944th dokutan 711 131 459ms 19 Aug 2024 946th janbehrens 🇩🇪 710 97 5ms 18 Feb 2022 947th emgordon154 710 162 2ms 9 Jun 2025 948th biinari 709 64 37ms 25 Mar 2018 948th Ardena 709 64 35ms 11 Dec 2020 948th 4hg 🇺🇸 709 64 33ms 8 Nov 2022 951st edsrzf 🇳🇿 709 86 40ms 14 Feb 2025 952nd Mr-Xcoder 708 75 10ms 28 Dec 2018 952nd giacomogallina 708 75 9ms 14 Jun 2019 952nd petar-donchev 708 75 10ms 5 Sep 2019 952nd PiterAnnema 708 75 10ms 30 Aug 2020 952nd BLorant 708 75 10ms 23 Dec 2020 952nd qrico64 708 75 10ms 2 Feb 2021 952nd Brianzhengca 708 75 9ms 2 Feb 2021 952nd RobbeSneyders 708 75 10ms 29 Nov 2021 952nd neihousaigaai 708 75 10ms 6 Mar 2022 First Prev 881–960 of 3,157 Next Last