The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Reverse Polish Notation 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 81st xnor-gate 917 113 38ms 14 Feb 2022 82nd lifthrasiir 🇰🇷 909 114 41ms 22 Nov 2024 83rd ovs-code 🇩🇪 907 54 38ms 14 Feb 2022 83rd akshatj27 🇦🇶 907 54 43ms 14 Feb 2022 83rd primo-ppcg 🇹🇭 907 54 39ms 14 Feb 2022 83rd Lydxn 🇨🇦 907 54 40ms 14 Feb 2022 83rd sisyphus-ppcg 🇦🇺 907 54 36ms 16 Feb 2022 83rd radarek 🇵🇱 907 54 42ms 26 Feb 2022 83rd Steffan153 🇫🇮 907 54 38ms 20 Aug 2024 83rd sean-niemann 🇺🇸 907 54 39ms 3 Aug 2025 83rd Natanaelel 🇸🇪 907 54 41ms 10 Feb 2026 92nd ovs-code 🇩🇪 903 130 1ms 3 Jun 2024 93rd lynn 901 115 13ms 12 Feb 2022 93rd GolfingSuccess 🇬🇷 901 115 14ms 12 Feb 2022 93rd hallvabo 🇳🇴 901 115 37ms 14 Feb 2022 93rd Kacarott 🇦🇺 901 115 412ms 4 Feb 2025 97th ovs-code 🇩🇪 896 92 526ms 16 Nov 2024 98th thehylian 893 116 16ms 14 Jan 2023 98th Just4FunCoder 893 116 16ms 26 Mar 2023 98th zacjl 893 116 17ms 20 Apr 2023 98th emgordon154 893 116 38ms 29 Sep 2025 98th plcc0 893 116 36ms 12 Jan 2026 103rd MeWhenI 🇻🇦 890 55 69ms 22 Aug 2022 104th btnlq 890 154 404ms 12 Mar 2023 105th JayXon 🇺🇸 887 158 58ms 10 Dec 2023 106th betaveros 886 117 15ms 31 Dec 2022 106th DayDun 🇸🇪 886 117 22ms 22 Jan 2023 106th b-illy 🇬🇧 886 117 17ms 24 Aug 2024 106th KasperKivimaeki 🇫🇮 886 117 17ms 1 Jul 2025 106th bzijlema 🇳🇱 886 117 16ms 12 Nov 2025 106th snoozingnewt 🇨🇦 886 117 16ms 5 Dec 2025 106th Natanaelel 🇸🇪 886 117 12ms 10 Feb 2026 106th StefanHabel 🇨🇦 886 117 15ms 7 days ago 106th SectorCorruptor 886 117 16ms 6 hours ago 115th GrayJoKing 🇦🇺 885 111 57ms 17 Jan 2023 116th JayXon 🇺🇸 885 211 255ms 3 Sep 2023 117th Kacarott 🇦🇺 884 36 61ms 9 Dec 2025 117th error256 884 36 60ms 18 days ago 119th JayXon 🇺🇸 884 155 400ms 10 Dec 2023 120th primo-ppcg 🇹🇭 881 46 6ms 13 Feb 2022 120th saito-ta 🇯🇵 881 46 6ms 23 Dec 2022 120th sisyphus-ppcg 🇦🇺 881 46 7ms 18 Jan 2023 123rd typeswitch-dev 🇵🇹 881 212 206ms 30 Aug 2023 124th bizy-coder 878 118 44ms 6 Aug 2023 124th Rubiksmath 878 118 40ms 7 Aug 2023 124th anter69 🇭🇺 878 118 167ms 2 Apr 2024 124th blaztoma 🇱🇹 878 118 42ms 16 Feb 2026 128th JayXon 🇺🇸 877 94 457ms 16 Nov 2024 129th sisyphus-ppcg 🇦🇺 877 112 174ms 10 Apr 2022 129th btnlq 877 112 14ms 29 Dec 2022 129th edsrzf 🇳🇿 877 112 27ms 13 Nov 2025 129th frosster 🇨🇦 877 112 34ms 5 Feb 2026 129th Steffan153 🇫🇮 877 112 172ms 20 days ago 134th arjanadriaanse 🇳🇱 877 151 147ms 13 Feb 2022 134th lynn 877 151 149ms 13 Feb 2022 134th xnor-gate 877 151 142ms 16 Feb 2022 134th ovs-code 🇩🇪 877 151 149ms 12 May 2023 134th HPWiz 🇳🇿 877 151 146ms 11 Nov 2023 139th JayXon 🇺🇸 876 182 500ms 26 Sep 2025 140th Frowny 871 119 118ms 13 Feb 2022 140th prplz 🇦🇺 871 119 15ms 13 Feb 2022 140th ZakkkkAttackkkk 🇵🇭 871 119 41ms 14 Feb 2022 140th bricknellj 871 119 21ms 14 Feb 2023 140th edsrzf 🇳🇿 871 119 21ms 4 Oct 2025 140th ryyyn 🇺🇸 871 119 16ms 8 Feb 2026 146th Sakisan 🇧🇪 871 152 140ms 25 Feb 2023 146th Natanaelel 🇸🇪 871 152 148ms 10 Apr 2025 148th ScottHamper 871 183 576ms 30 Nov 2025 149th typeswitch-dev 🇵🇹 869 30 3ms 28 Jul 2023 150th annaproxy 865 153 145ms 15 Feb 2022 150th Steffan153 🇫🇮 865 153 144ms 27 Jun 2024 152nd ovs-code 🇩🇪 864 40 3ms 14 Jul 2023 152nd HPWiz 🇳🇿 864 40 2ms 17 Nov 2023 154th TobyBoyne 🇬🇧 864 120 16ms 18 Feb 2022 154th OllieBoyne 🇬🇧 864 120 16ms 18 Feb 2022 154th petroselo 864 120 201ms 12 Apr 2022 154th annaproxy 864 120 11ms 14 Aug 2022 154th inventshah 864 120 15ms 15 Nov 2022 154th CaedenHarper 🇨🇦 864 120 16ms 27 Dec 2024 154th Artemis21 🇬🇧 864 120 19ms 6 Jan 2025 First Prev 81–160 of 1,190 Next Last