The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 721st Sp3000 🇦🇺 693 41 4ms 19 Jan 2024 721st MeWhenI 🇻🇦 693 41 5ms 2 Mar 2025 723rd KingSkyrock 🇺🇸 692 106 13ms 17 Mar 2022 724th ian-h-chamberlain 🇺🇸 692 270 226ms 13 Nov 2025 725th lifthrasiir 🇰🇷 691 50 3ms 28 Nov 2024 726th sleepyStick 691 150 16ms 15 Jul 2022 726th galloj 🇨🇿 691 150 16ms 9 Jan 2023 726th keelimeguy 🇺🇸 691 150 10ms 7 Nov 2023 726th CutSandstone 691 150 18ms 8 Jul 2024 730th Shanethegamer 🇺🇸 691 184 42ms 6 Sep 2024 731st anter69 🇭🇺 690 71 38ms 2 Apr 2024 732nd Ripick 688 186 374ms 24 Jun 2025 733rd edsrzf 🇳🇿 686 38 4ms 14 Oct 2025 733rd error256 686 38 4ms 7 days ago 735th MathisBullinger 686 107 12ms 11 May 2022 735th CaedenHarper 🇨🇦 686 107 11ms 23 Aug 2025 737th jacklynnepenick 686 151 16ms 15 Feb 2022 737th ssbhatt4321 686 151 19ms 11 Jun 2023 737th thienudomsrirungruang 686 151 17ms 16 Apr 2024 737th mishak-sys 686 151 25ms 24 Feb 2025 741st iakolzin 684 205 61ms 1 Jul 2022 742nd kg583 🇺🇸 683 212 75ms 11 days ago 743rd TheBlupper 682 152 15ms 8 Nov 2022 743rd cakular 682 152 11ms 17 May 2024 743rd yokasuretsu 682 152 15ms 14 Jan 2025 743rd islptng 682 152 16ms 14 Oct 2025 747th edsrzf 🇳🇿 682 160 105ms 10 Nov 2025 748th revlayle 🇺🇸 682 201 390ms 9 Dec 2022 749th CatsAreFluffy 681 206 70ms 24 Feb 2023 750th emgordon154 680 72 37ms 20 Nov 2024 750th Lv0Sys 🇵🇱 680 72 37ms 6 Dec 2025 752nd janbehrens 🇩🇪 678 199 505ms 26 Mar 2022 753rd roavin 678 202 384ms 30 Jun 2022 754th hjcafaroUC 677 153 14ms 20 Aug 2022 754th LogicalJoe 677 153 10ms 29 Nov 2022 756th prestosilver 🇺🇸 675 174 1ms 18 Nov 2025 757th Mikey-Beep 🇬🇧 675 203 381ms 2 Sep 2024 757th tomh1012 675 203 384ms 5 Sep 2025 759th 386asm 🇺🇸 675 222 43ms 5 May 2023 760th randolchance 673 109 13ms 4 Jan 2024 761st edsrzf 🇳🇿 673 124 5ms 6 Oct 2025 762nd KatieLG-Transpiler 🇬🇧 673 154 91ms 4 Nov 2022 762nd stertooy 🇧🇪 673 154 16ms 14 Jun 2024 764th MeWhenI 🇻🇦 670 146 6ms 13 Aug 2024 765th AbhilashaTandon 669 155 15ms 21 Nov 2022 765th aksyristos 669 155 10ms 29 Nov 2022 765th b10011 🇫🇮 669 155 16ms 21 Jan 2023 765th Stockoh 🇫🇷 669 155 15ms 17 Oct 2024 769th albanian-laundromat 668 39 4ms 13 Feb 2026 770th Natanaelel 🇸🇪 668 86 33ms 29 Jan 2024 771st janbehrens 🇩🇪 667 6 51ms 25 Nov 2022 772nd JOrE20 667 110 11ms 11 Feb 2026 773rd Shanethegamer 🇺🇸 666 61 6ms 13 Feb 2022 774th SirBogman 🇺🇸 665 72 1,689ms 11 Mar 2022 775th janbehrens 🇩🇪 665 206 387ms 26 Feb 2022 776th Garklein 🇨🇦 664 52 3ms 13 Feb 2022 776th Natanaelel 🇸🇪 664 52 2ms 14 Jul 2023 776th SirBogman 🇺🇸 664 52 2ms 6 Nov 2023 779th dokutan 664 124 461ms 14 Sep 2024 780th DialFrost 🇸🇬 664 156 11ms 21 Nov 2022 781st jgbaldwinbrown 663 177 2ms 15 Jun 2022 782nd oeb25 663 282 219ms 16 May 2022 783rd m-tkach 🇺🇦 662 74 51ms 25 Jun 2024 784th edsrzf 🇳🇿 662 182 113ms 30 Nov 2025 785th billings7 🇬🇧 662 207 389ms 16 Apr 2022 786th two-bad 🇬🇧 661 111 13ms 25 Feb 2024 786th Protothor 661 111 11ms 15 days ago 788th trist224 🇫🇷 660 157 10ms 29 Nov 2022 788th TaserTheFox 🇺🇸 660 157 16ms 20 Jan 2023 790th CatsAreFluffy 660 178 2ms 24 Feb 2023 791st inventshah 659 124 2,000ms 7 Nov 2022 791st stellartux 659 124 349ms 24 Dec 2023 793rd neel11235813 659 125 450ms 17 Mar 2024 793rd Babafaba 659 125 536ms 23 Oct 2025 793rd albanian-laundromat 659 125 517ms 18 Dec 2025 796th IISResetMe 657 88 389ms 25 Dec 2025 797th edsrzf 🇳🇿 657 282 6ms 20 Feb 2025 798th jerrandolph 653 280 306ms 19 Dec 2023 799th Florian-Mt 653 286 300ms 15 Jul 2024 800th neihousaigaai 652 159 20ms 20 Feb 2022 First Prev 721–800 of 1,191 Next Last