The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Pascal’s Triangle 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 801st D-MOVE 🇵🇭 828 46 37ms 15 Feb 2026 802nd tri1212 🇻🇳 827 59 10ms 30 Jun 2024 802nd qpwoeirut 827 59 10ms 1 Oct 2025 804th inventshah 827 78 2ms 20 Sep 2022 805th treeowl 827 80 110ms 25 Feb 2019 805th user189032 827 80 114ms 29 May 2019 805th strout 827 80 118ms 15 Dec 2023 805th tobeannouncd 827 80 108ms 8 Jan 2024 805th alomiF 827 80 121ms 23 Aug 2024 810th janbehrens 🇩🇪 827 96 56ms 20 Nov 2022 811th zakariamouhid 825 126 24ms 10 Jan 2023 811th AlephSquirrel 825 126 26ms 8 Sep 2024 813th mcreenan 822 26 99ms 2 Apr 2018 814th arjanadriaanse 🇳🇱 822 72 47ms 28 Sep 2023 814th annaproxy 822 72 9ms 4 Oct 2023 816th Yewzir 🇧🇪 822 88 381ms 28 Mar 2024 816th fuzzylojik-golf 🇺🇸 822 88 361ms 16 Sep 2025 818th rucin93 🇵🇱 821 59 5ms 7 Dec 2020 819th janbehrens 🇩🇪 821 92 134ms 8 Jun 2021 820th sean-niemann 🇺🇸 821 93 521ms 24 Sep 2025 820th sisyphus-ppcg 🇦🇺 821 93 368ms 25 Nov 2025 822nd dokutan 821 122 295ms 14 Jul 2025 823rd jared-hughes 821 138 7ms 16 Jul 2023 824th AlephSquirrel 820 75 1ms 13 May 2020 824th Steffan153 🇫🇮 820 75 2ms 23 Feb 2023 824th sean-niemann 🇺🇸 820 75 2ms 7 May 2024 824th inventshah 820 75 1ms 27 Mar 2025 828th efgen 819 61 11ms 12 Jun 2020 828th uttumuttu 🇫🇮 819 61 13ms 4 Jan 2022 828th KingSkyrock 🇺🇸 819 61 16ms 28 Jan 2022 828th dmrichwa 🇺🇸 819 61 11ms 4 Dec 2022 828th apreg 819 61 10ms 3 May 2023 828th duckyluuk 🇳🇱 819 61 10ms 4 Oct 2024 834th Shanethegamer 🇺🇸 818 63 6ms 23 Dec 2023 835th rucin93 🇵🇱 817 71 2ms 18 Dec 2025 836th edsrzf 🇳🇿 817 75 118ms 7 Dec 2025 837th yzhs 🇩🇪 817 81 109ms 15 Feb 2020 837th cbrt-x 817 81 114ms 18 Sep 2023 837th DialFrost 🇸🇬 817 81 116ms 4 Aug 2024 840th DialFrost 🇸🇬 817 213 11ms 14 Aug 2025 841st DialFrost 🇸🇬 816 27 38ms 15 Mar 2025 841st fuzzylojik-golf 🇺🇸 816 27 40ms 18 Sep 2025 841st CaedenHarper 🇨🇦 816 27 39ms 6 Oct 2025 841st blaztoma 🇱🇹 816 27 39ms 19 Jan 2026 845th kg583 🇺🇸 816 66 4ms 29 Sep 2025 846th GrayJoKing 🇦🇺 816 79 2ms 11 Sep 2022 847th emgordon154 815 70 6ms 22 days ago 848th Kacarott 🇦🇺 814 55 388ms 15 Jan 2024 848th sisyphus-ppcg 🇦🇺 814 55 467ms 17 Jan 2024 848th KatieLG 🇬🇧 814 55 376ms 28 Oct 2024 848th ndren 814 55 416ms 8 Feb 2026 852nd adamnielson42 🇺🇸 813 32 2ms 10 Jan 2024 853rd Steffan153 🇫🇮 813 53 1ms 20 Jul 2024 854th OwPowell 813 60 10ms 15 Oct 2022 854th nkoppel 813 60 10ms 20 Oct 2022 854th grhkm21 813 60 10ms 19 Dec 2022 854th Madjosz 813 60 10ms 20 Sep 2023 854th error256 813 60 10ms 11 May 2025 854th dirckvdende 813 60 10ms 11 Jul 2025 860th edsrzf 🇳🇿 813 65 6ms 28 Oct 2025 861st annaproxy 813 89 412ms 11 Apr 2025 862nd MeWhenI 🇻🇦 811 73 2,575ms 24 Oct 2024 862nd sean-niemann 🇺🇸 811 73 2,654ms 24 Oct 2024 862nd Shanethegamer 🇺🇸 811 73 2,774ms 28 Oct 2024 865th Waffle3z 810 47 36ms 18 Oct 2020 865th eggplants 🇯🇵 810 47 34ms 26 Nov 2020 865th jaredcrystal 🇺🇸 810 47 38ms 14 Dec 2020 865th OhmNomNom 810 47 34ms 12 Oct 2022 865th aaronze 🇦🇺 810 47 33ms 23 Sep 2023 865th Just4FunCoder 810 47 35ms 1 Oct 2025 871st Attero 🇸🇪 809 76 2ms 24 May 2020 871st jared-hughes 809 76 2ms 2 Nov 2022 873rd DialFrost 🇸🇬 808 87 466ms 13 Nov 2025 874th edsrzf 🇳🇿 807 60 5ms 22 Sep 2024 874th dokutan 807 60 5ms 4 Jul 2025 876th annaproxy 807 82 120ms 7 Feb 2022 876th netfri25 🇮🇱 807 82 117ms 19 Feb 2026 878th jared-hughes 806 62 9ms 8 Sep 2021 878th emgordon154 806 62 11ms 24 Dec 2021 878th idavidka 🇭🇺 806 62 9ms 24 Apr 2023 First Prev 801–880 of 3,049 Next Last