The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 30 hours. 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 emgordon154 694 118 1,301ms 3 Dec 2024 722nd Sp3000 🇦🇺 693 41 4ms 19 Jan 2024 722nd MeWhenI 🇻🇦 693 41 5ms 2 Mar 2025 724th KingSkyrock 🇺🇸 692 106 13ms 17 Mar 2022 725th ian-h-chamberlain 🇺🇸 692 270 217ms 13 Nov 2025 726th lifthrasiir 🇰🇷 691 50 3ms 28 Nov 2024 727th sleepyStick 691 150 16ms 15 Jul 2022 727th galloj 🇨🇿 691 150 16ms 9 Jan 2023 727th keelimeguy 🇺🇸 691 150 10ms 7 Nov 2023 727th CutSandstone 691 150 18ms 8 Jul 2024 731st Shanethegamer 🇺🇸 691 184 42ms 6 Sep 2024 732nd anter69 🇭🇺 690 71 38ms 2 Apr 2024 733rd Ripick 688 186 374ms 24 Jun 2025 734th edsrzf 🇳🇿 686 38 4ms 14 Oct 2025 734th error256 686 38 4ms 12 days ago 736th MathisBullinger 686 107 12ms 11 May 2022 736th CaedenHarper 🇨🇦 686 107 11ms 23 Aug 2025 738th jacklynnepenick 686 151 16ms 15 Feb 2022 738th ssbhatt4321 686 151 19ms 11 Jun 2023 738th thienudomsrirungruang 686 151 17ms 16 Apr 2024 738th mishak-sys 686 151 25ms 24 Feb 2025 742nd iakolzin 684 205 61ms 1 Jul 2022 743rd kg583 🇺🇸 683 212 75ms 16 days ago 744th TheBlupper 682 152 15ms 8 Nov 2022 744th cakular 682 152 11ms 17 May 2024 744th yokasuretsu 682 152 15ms 14 Jan 2025 744th islptng 682 152 16ms 14 Oct 2025 748th edsrzf 🇳🇿 682 160 105ms 10 Nov 2025 749th revlayle 🇺🇸 682 201 390ms 9 Dec 2022 750th CatsAreFluffy 681 206 70ms 24 Feb 2023 751st emgordon154 680 72 37ms 20 Nov 2024 751st Lv0Sys 🇵🇱 680 72 37ms 6 Dec 2025 753rd janbehrens 🇩🇪 678 199 505ms 26 Mar 2022 754th roavin 678 202 384ms 30 Jun 2022 755th hjcafaroUC 677 153 14ms 20 Aug 2022 755th LogicalJoe 677 153 10ms 29 Nov 2022 757th prestosilver 🇺🇸 675 174 1ms 18 Nov 2025 758th Mikey-Beep 🇬🇧 675 203 381ms 2 Sep 2024 758th tomh1012 675 203 384ms 5 Sep 2025 760th 386asm 🇺🇸 675 222 43ms 5 May 2023 761st randolchance 673 109 13ms 4 Jan 2024 762nd edsrzf 🇳🇿 673 124 5ms 6 Oct 2025 763rd KatieLG-Transpiler 🇬🇧 673 154 91ms 4 Nov 2022 763rd stertooy 🇧🇪 673 154 16ms 14 Jun 2024 765th MeWhenI 🇻🇦 670 146 6ms 13 Aug 2024 766th AbhilashaTandon 669 155 15ms 21 Nov 2022 766th aksyristos 669 155 10ms 29 Nov 2022 766th b10011 🇫🇮 669 155 16ms 21 Jan 2023 766th Stockoh 🇫🇷 669 155 15ms 17 Oct 2024 770th albanian-laundromat 668 39 4ms 13 Feb 2026 771st Natanaelel 🇸🇪 668 86 33ms 29 Jan 2024 772nd janbehrens 🇩🇪 667 6 51ms 25 Nov 2022 773rd JOrE20 667 110 11ms 11 Feb 2026 774th Shanethegamer 🇺🇸 666 61 6ms 13 Feb 2022 775th SirBogman 🇺🇸 665 72 1,689ms 11 Mar 2022 776th janbehrens 🇩🇪 665 206 387ms 26 Feb 2022 777th Garklein 🇨🇦 664 52 3ms 13 Feb 2022 777th Natanaelel 🇸🇪 664 52 2ms 14 Jul 2023 777th SirBogman 🇺🇸 664 52 2ms 6 Nov 2023 780th dokutan 664 124 461ms 14 Sep 2024 781st DialFrost 🇸🇬 664 156 11ms 21 Nov 2022 782nd jgbaldwinbrown 663 177 2ms 15 Jun 2022 783rd oeb25 663 282 193ms 16 May 2022 784th m-tkach 🇺🇦 662 74 51ms 25 Jun 2024 785th edsrzf 🇳🇿 662 182 113ms 30 Nov 2025 786th billings7 🇬🇧 662 207 389ms 16 Apr 2022 787th two-bad 🇬🇧 661 111 13ms 25 Feb 2024 787th Protothor 661 111 11ms 20 days ago 789th trist224 🇫🇷 660 157 10ms 29 Nov 2022 789th TaserTheFox 🇺🇸 660 157 16ms 20 Jan 2023 791st CatsAreFluffy 660 178 2ms 24 Feb 2023 792nd inventshah 659 124 2,000ms 7 Nov 2022 792nd stellartux 659 124 349ms 24 Dec 2023 794th neel11235813 659 125 450ms 17 Mar 2024 794th Babafaba 659 125 536ms 23 Oct 2025 794th albanian-laundromat 659 125 517ms 18 Dec 2025 797th IISResetMe 657 88 389ms 25 Dec 2025 798th edsrzf 🇳🇿 657 282 6ms 20 Feb 2025 799th jerrandolph 653 280 306ms 19 Dec 2023 800th Florian-Mt 653 286 292ms 15 Jul 2024 First Prev 721–800 of 1,192 Next Last