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?
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 561st GrayJoKing 🇦🇺 756 109 677ms 16 Jan 2024 561st b-illy 🇬🇧 756 109 570ms 7 Sep 2024 561st snoozingnewt 🇨🇦 756 109 433ms 5 Dec 2025 564th Waffle3z 756 130 3ms 6 Apr 2022 565th P-Quentin 🇫🇷 756 137 17ms 5 Aug 2022 565th nstearns96 🇬🇧 756 137 22ms 15 Dec 2022 565th mossprescott 756 137 11ms 19 Jan 2023 565th taesungh 756 137 17ms 15 Oct 2023 565th PyryL 🇫🇮 756 137 21ms 25 Aug 2024 570th MeWhenI 🇻🇦 756 154 14ms 26 Apr 2024 571st stefangimmillaro 756 247 255ms 13 Nov 2023 572nd marshallward 🇺🇸 755 242 40ms 7 Sep 2022 573rd MeWhenI 🇻🇦 754 158 167ms 2 days ago 574th Mandrzejy 🇵🇱 754 186 65ms 9 Apr 2024 575th GolfingSuccess 🇬🇷 754 192 76ms 9 days ago 576th lifthrasiir 🇰🇷 754 274 7ms 19 Dec 2024 577th michelebastione 🇮🇹 751 138 16ms 19 Feb 2022 577th knutae 🇳🇴 751 138 16ms 8 Mar 2022 577th RDShah 751 138 31ms 15 May 2022 577th SB-945 751 138 16ms 11 Jan 2024 577th ImpressedByRocks 751 138 16ms 10 Oct 2024 582nd sean-niemann 🇺🇸 750 124 126ms 2 Jul 2025 583rd stefangimmillaro 750 180 128ms 25 Dec 2022 584th klixel 🇨🇦 750 249 234ms 19 Jun 2023 585th xem 749 98 16ms 18 Feb 2022 585th Maznek 749 98 11ms 6 Jun 2023 585th dgerblick 749 98 11ms 16 Jun 2023 588th bizy-coder 749 110 428ms 16 Jan 2024 588th MeWhenI 🇻🇦 749 110 662ms 24 May 2024 588th Shanethegamer 🇺🇸 749 110 473ms 17 Sep 2024 588th CaedenHarper 🇨🇦 749 110 496ms 27 Dec 2024 592nd Shanethegamer 🇺🇸 749 180 486ms 14 Jul 2023 593rd MichalMarsalek 🇨🇿 748 171 418ms 8 Mar 2022 594th the-zammers 748 177 146ms 9 Apr 2024 595th Frowny 747 77 34ms 21 Feb 2022 596th Re-Adventures 🇮🇳 747 250 229ms 20 Jan 2023 597th cefqrn 746 139 16ms 20 Dec 2022 597th alfonsoalves 746 139 17ms 1 Mar 2024 597th hiichbindermax 746 139 35ms 19 Sep 2024 597th jacekwladzinski 746 139 12ms 10 Oct 2025 601st Vinterion 746 212 33ms 6 Oct 2024 602nd Shanethegamer 🇺🇸 745 149 115ms 18 Mar 2023 603rd Shanethegamer 🇺🇸 745 160 155ms 24 May 2025 604th h3ra993huskp 🇯🇵 745 214 463ms 30 Nov 2025 605th MeWhenI 🇻🇦 744 110 1,268ms 11 May 2023 606th Shanethegamer 🇺🇸 744 172 418ms 21 Feb 2023 607th HallMatthew314 744 178 145ms 13 Sep 2022 608th Shanethegamer 🇺🇸 743 110 653ms 25 Apr 2023 609th scpchicken 🇵🇼 742 66 39ms 13 Feb 2022 610th retrohun 742 81 11ms 15 Dec 2023 611th DialFrost 🇸🇬 741 99 11ms 24 Dec 2024 612th luuumine 🇫🇷 741 252 200ms 28 Nov 2025 613th Irratix 🇳🇱 740 140 13ms 27 Apr 2022 613th JunkIce 740 140 29ms 2 Dec 2024 615th tailorspy 738 190 69ms 1 Jun 2024 616th MeWhenI 🇻🇦 737 111 376ms 14 Feb 2023 617th AlephSquirrel 737 140 5ms 25 Jan 2025 618th hemphen 737 186 374ms 20 Oct 2022 619th Shanethegamer 🇺🇸 737 248 298ms 20 Apr 2022 620th zacjl 735 47 2ms 22 Jan 2025 620th GrayJoKing 🇦🇺 735 47 3ms 5 Jun 2025 622nd SirFireball3521 735 141 38ms 7 Feb 2023 622nd AstroOrbis 735 141 16ms 12 Jul 2025 622nd osNiko 🇧🇷 735 141 17ms 30 Dec 2025 625th KatieLG 🇬🇧 734 100 13ms 5 Jan 2023 625th chasewalden 734 100 11ms 24 Apr 2023 625th MeWhenI 🇻🇦 734 100 11ms 3 Aug 2024 625th Salutations45 734 100 14ms 12 Nov 2024 629th MeWhenI 🇻🇦 734 249 291ms 7 Jul 2023 630th DialFrost 🇸🇬 733 82 44ms 23 Apr 2025 631st emgordon154 732 137 23ms 29 Jul 2025 632nd edsrzf 🇳🇿 731 67 38ms 14 Feb 2026 633rd edsrzf 🇳🇿 731 87 1,022ms 18 Feb 2026 634th edsrzf 🇳🇿 731 112 1,341ms 4 Feb 2026 635th albanian-laundromat 731 197 5ms 1 Jul 2025 636th DialFrost 🇸🇬 731 218 387ms 24 Sep 2025 637th KatieLG 🇬🇧 730 142 94ms 12 Feb 2022 637th MichalMarsalek 🇨🇿 730 142 17ms 14 Feb 2022 637th marcin7Cd 730 142 15ms 20 Feb 2022 637th yzhs 🇩🇪 730 142 16ms 23 Jun 2023 First Prev 561–640 of 1,192 Next Last