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?
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 400th GrayJoKing 🇦🇺 798 60 1,286ms 8 May 2022 402nd tayloia 🇬🇧 798 92 14ms 10 Jan 2023 402nd voytxt 🇨🇿 798 92 12ms 28 Dec 2023 402nd olleicua 🇺🇸 798 92 11ms 12 Feb 2024 402nd targrik 798 92 11ms 3 Apr 2025 402nd fuzzylojik-golf 🇺🇸 798 92 12ms 19 Jul 2025 402nd edsrzf 🇳🇿 798 92 11ms 5 days ago 408th MeWhenI 🇻🇦 798 229 41ms 2 Jul 2023 409th CedricGebistorf 797 130 17ms 16 Mar 2022 410th GrayJoKing 🇦🇺 797 137 107ms 2 Jun 2022 411th GrayJoKing 🇦🇺 796 40 63ms 13 Sep 2023 411th chunes3 🇺🇸 796 40 70ms 13 Sep 2023 411th Bubbler-4 796 40 69ms 13 Sep 2023 411th sisyphus-ppcg 🇦🇺 796 40 64ms 13 Sep 2023 411th gifti258 796 40 69ms 13 Sep 2023 411th ovs-code 🇩🇪 796 40 60ms 13 Sep 2023 411th GolfingSuccess 🇬🇷 796 40 63ms 15 Sep 2023 411th Steffan153 🇫🇮 796 40 71ms 17 Sep 2023 411th 4hg 🇺🇸 796 40 69ms 18 Sep 2023 411th primo-ppcg 🇹🇭 796 40 67ms 19 Sep 2023 411th MeWhenI 🇻🇦 796 40 71ms 6 Nov 2023 411th edsrzf 🇳🇿 796 40 64ms 25 Sep 2024 411th pardouin 🇫🇷 796 40 65ms 25 Sep 2024 411th sean-niemann 🇺🇸 796 40 65ms 9 Apr 2025 411th DialFrost 🇸🇬 796 40 64ms 9 Apr 2025 411th fuzzylojik-golf 🇺🇸 796 40 62ms 17 Sep 2025 411th JayXon 🇺🇸 796 40 65ms 4 Nov 2025 428th JRaspass 🇬🇧 796 51 7ms 12 Feb 2022 428th akshatj27 🇦🇶 796 51 5ms 12 Feb 2022 428th NewDefectus 🇮🇱 796 51 6ms 12 Feb 2022 428th ovs-code 🇩🇪 796 51 8ms 4 May 2023 432nd ovs-code 🇩🇪 796 312 1,468ms 1 Feb 2025 433rd Sakisan 🇧🇪 795 42 1,032ms 29 Dec 2025 434th sean-niemann 🇺🇸 795 92 146ms 12 Jun 2025 434th Steffan153 🇫🇮 795 92 148ms 26 days ago 436th pardouin 🇫🇷 795 103 2,699ms 9 Aug 2025 437th verticallity 795 235 188ms 5 Apr 2022 438th primo-ppcg 🇹🇭 793 189 39ms 6 Jul 2022 439th nwellnhof 🇩🇪 792 73 420ms 3 Jun 2022 440th andersk 🇺🇸 792 236 194ms 1 Nov 2022 440th funnsam 🇭🇰 792 236 254ms 23 Oct 2023 442nd jared-hughes 792 261 9ms 8 Jul 2024 443rd amollberg 🇸🇪 791 131 17ms 15 Feb 2022 443rd 5quiwyrm 791 131 19ms 11 Feb 2023 443rd BREMAUCY 🇫🇷 791 131 17ms 26 Jul 2023 443rd vishwathg 791 131 16ms 25 Jul 2025 443rd InigoK 🇺🇸 791 131 11ms 30 Aug 2025 443rd Aquateraneal 🇺🇸 791 131 15ms 20 days ago 449th GolfingSuccess 🇬🇷 791 132 4ms 29 Jan 2024 450th inventshah 791 182 3ms 14 Sep 2022 451st GrayJoKing 🇦🇺 791 200 35ms 17 Jan 2023 452nd GolfingSuccess 🇬🇷 791 314 1,414ms 3 Feb 2025 453rd nwellnhof 🇩🇪 790 62 40ms 4 Jun 2022 453rd KL-Lru 790 62 39ms 29 Dec 2022 455th MeWhenI 🇻🇦 790 127 417ms 12 Apr 2024 456th prplz 🇦🇺 789 93 11ms 14 Feb 2022 456th primo-ppcg 🇹🇭 789 93 14ms 16 Feb 2022 456th kcinnu 🇱🇹 789 93 12ms 16 Aug 2022 456th dzshn 789 93 12ms 24 Aug 2022 456th eranws 789 93 13ms 13 Oct 2022 456th biocommando 🇫🇮 789 93 12ms 13 Mar 2024 456th BalaM314 789 93 14ms 7 Feb 2025 456th Andrey-Plotnikov 789 93 11ms 25 Jun 2025 464th KasperKivimaeki 🇫🇮 788 178 446ms 8 Dec 2025 465th mousetail 🇳🇱 788 237 189ms 16 May 2024 466th Shanethegamer 🇺🇸 787 183 4ms 11 Sep 2022 467th 2bular 785 44 3ms 21 Jun 2025 468th lifthrasiir 🇰🇷 785 105 561ms 2 Dec 2024 469th btnlq 785 131 25ms 30 Mar 2022 470th ndren 785 132 36ms 11 Nov 2023 470th mikehanus 785 132 16ms 21 Nov 2023 470th logvp 785 132 17ms 28 Dec 2023 470th dokutan 785 132 16ms 14 Sep 2024 474th GrayJoKing 🇦🇺 784 104 6ms 31 Aug 2023 475th duckyluuk 🇳🇱 783 143 10ms 26 Feb 2025 476th MostParsingVex 783 150 1ms 3 Jan 2025 477th GolfingSuccess 🇬🇷 783 184 2ms 11 Sep 2022 478th KrausRaus 🇺🇸 781 94 11ms 13 Feb 2022 478th SirBogman 🇺🇸 781 94 14ms 7 May 2022 478th iliazeus 781 94 25ms 4 Sep 2022 First Prev 401–480 of 1,191 Next Last