The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Reverse Polish Notation 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 297th albanian-laundromat 800 5 51ms 20 Aug 2025 297th blaztoma 🇱🇹 800 5 48ms 8 Jan 2026 297th TheZwierzLF 🇵🇱 800 5 53ms 9 Jan 2026 297th JOrE20 800 5 47ms 10 Feb 2026 325th emgordon154 800 83 451ms 29 Sep 2025 326th P-Quentin 🇫🇷 800 94 16ms 5 Aug 2022 326th SB-945 800 94 18ms 11 Jan 2024 328th edsrzf 🇳🇿 800 142 46ms 16 Aug 2025 329th Steffan153 🇫🇮 800 181 74ms 34 mins ago 330th primo-ppcg 🇹🇭 800 236 26ms 25 Jun 2022 331st aadenboy 🇺🇸 799 123 3ms 17 Dec 2025 332nd tayloia 🇬🇧 798 92 14ms 10 Jan 2023 332nd voytxt 🇨🇿 798 92 12ms 28 Dec 2023 332nd olleicua 🇺🇸 798 92 11ms 12 Feb 2024 332nd targrik 798 92 11ms 3 Apr 2025 332nd fuzzylojik-golf 🇺🇸 798 92 12ms 19 Jul 2025 332nd edsrzf 🇳🇿 798 92 11ms 5 days ago 338th nwellnhof 🇩🇪 798 146 2ms 16 Feb 2022 339th MeWhenI 🇻🇦 798 229 41ms 2 Jul 2023 340th GrayJoKing 🇦🇺 796 40 63ms 13 Sep 2023 340th chunes3 🇺🇸 796 40 70ms 13 Sep 2023 340th Bubbler-4 796 40 69ms 13 Sep 2023 340th sisyphus-ppcg 🇦🇺 796 40 64ms 13 Sep 2023 340th gifti258 796 40 69ms 13 Sep 2023 340th ovs-code 🇩🇪 796 40 60ms 13 Sep 2023 340th GolfingSuccess 🇬🇷 796 40 63ms 15 Sep 2023 340th Steffan153 🇫🇮 796 40 71ms 17 Sep 2023 340th 4hg 🇺🇸 796 40 69ms 18 Sep 2023 340th primo-ppcg 🇹🇭 796 40 67ms 19 Sep 2023 340th MeWhenI 🇻🇦 796 40 71ms 6 Nov 2023 340th edsrzf 🇳🇿 796 40 64ms 25 Sep 2024 340th pardouin 🇫🇷 796 40 65ms 25 Sep 2024 340th sean-niemann 🇺🇸 796 40 65ms 9 Apr 2025 340th DialFrost 🇸🇬 796 40 64ms 9 Apr 2025 340th fuzzylojik-golf 🇺🇸 796 40 62ms 17 Sep 2025 340th JayXon 🇺🇸 796 40 65ms 4 Nov 2025 357th JRaspass 🇬🇧 796 51 7ms 12 Feb 2022 357th akshatj27 🇦🇶 796 51 5ms 12 Feb 2022 357th NewDefectus 🇮🇱 796 51 6ms 12 Feb 2022 357th ovs-code 🇩🇪 796 51 8ms 4 May 2023 361st ovs-code 🇩🇪 796 312 1,422ms 1 Feb 2025 362nd Sakisan 🇧🇪 795 42 1,032ms 29 Dec 2025 363rd pardouin 🇫🇷 795 103 2,699ms 9 Aug 2025 364th verticallity 795 235 190ms 5 Apr 2022 365th primo-ppcg 🇹🇭 793 189 39ms 6 Jul 2022 366th nwellnhof 🇩🇪 792 73 420ms 3 Jun 2022 367th Waffle3z 792 124 3ms 8 Apr 2022 368th andersk 🇺🇸 792 236 191ms 1 Nov 2022 368th funnsam 🇭🇰 792 236 251ms 23 Oct 2023 370th jared-hughes 792 261 9ms 8 Jul 2024 371st Irratix 🇳🇱 791 95 13ms 7 May 2022 371st JunkIce 791 95 35ms 2 Dec 2024 371st luuumine 🇫🇷 791 95 15ms 7 Oct 2025 374th GolfingSuccess 🇬🇷 791 132 4ms 29 Jan 2024 375th GrayJoKing 🇦🇺 791 200 35ms 17 Jan 2023 376th GolfingSuccess 🇬🇷 791 314 1,428ms 3 Feb 2025 377th prplz 🇦🇺 789 93 11ms 14 Feb 2022 377th primo-ppcg 🇹🇭 789 93 14ms 16 Feb 2022 377th dzshn 789 93 12ms 24 Aug 2022 377th eranws 789 93 13ms 13 Oct 2022 377th biocommando 🇫🇮 789 93 12ms 13 Mar 2024 377th BalaM314 789 93 14ms 7 Feb 2025 377th Andrey-Plotnikov 789 93 11ms 25 Jun 2025 377th KatieLG 🇬🇧 789 93 12ms 5 Oct 2025 385th KasperKivimaeki 🇫🇮 788 178 446ms 8 Dec 2025 386th mousetail 🇳🇱 788 237 197ms 16 May 2024 387th adriweb 🇫🇷 786 125 11ms 12 Oct 2023 388th 2bular 785 44 3ms 21 Jun 2025 389th btnlq 785 131 25ms 30 Mar 2022 390th GrayJoKing 🇦🇺 784 104 6ms 31 Aug 2023 391st KatieLG 🇬🇧 783 96 92ms 29 Jul 2024 392nd duckyluuk 🇳🇱 783 143 10ms 26 Feb 2025 393rd MostParsingVex 782 149 1ms 3 Jan 2025 394th KrausRaus 🇺🇸 781 94 11ms 13 Feb 2022 394th SirBogman 🇺🇸 781 94 14ms 7 May 2022 394th iliazeus 781 94 25ms 4 Sep 2022 394th Natanaelel 🇸🇪 781 94 13ms 9 Dec 2023 394th LukeBridges 🇬🇧 781 94 15ms 2 Oct 2024 399th Shanethegamer 🇺🇸 780 105 1,238ms 12 Dec 2022 400th lynn 779 203 33ms 16 Jul 2023 First Prev 321–400 of 1,185 Next Last