The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 38 hours. Why not try and solve them ahead of time?
Reverse Polish Notation in Python 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 160th hellwue 752 145 11ms 7 Feb 2023 160th adamnielson42 🇺🇸 752 145 23ms 8 Oct 2024 160th Mabeloid 🇳🇴 752 145 26ms 4 May 2025 160th te-chnical 752 145 16ms 9 Jul 2025 165th karhuthebear 747 146 17ms 6 May 2022 165th Bonjour27891 🇻🇳 747 146 10ms 17 Jul 2022 167th SomeKitten 🇺🇸 741 147 26ms 29 Aug 2022 167th Bodo171 741 147 19ms 7 Dec 2022 167th vgamula 🇺🇦 741 147 18ms 6 Nov 2023 167th croc54 741 147 17ms 27 Jan 2025 171st davecame 736 148 29ms 18 Sep 2023 171st jatloe 736 148 16ms 6 Sep 2024 173rd sleepyStick 727 150 16ms 15 Jul 2022 173rd galloj 🇨🇿 727 150 16ms 9 Jan 2023 173rd keelimeguy 🇺🇸 727 150 10ms 7 Nov 2023 173rd CutSandstone 727 150 18ms 8 Jul 2024 177th jacklynnepenick 722 151 16ms 15 Feb 2022 177th ssbhatt4321 722 151 19ms 11 Jun 2023 177th thienudomsrirungruang 722 151 17ms 16 Apr 2024 177th mishak-sys 722 151 25ms 24 Feb 2025 181st TheBlupper 717 152 15ms 8 Nov 2022 181st cakular 717 152 11ms 17 May 2024 181st yokasuretsu 717 152 15ms 14 Jan 2025 181st islptng 717 152 16ms 14 Oct 2025 185th hjcafaroUC 712 153 14ms 20 Aug 2022 185th LogicalJoe 712 153 10ms 29 Nov 2022 187th KatieLG-Transpiler 🇬🇧 708 154 91ms 4 Nov 2022 187th stertooy 🇧🇪 708 154 16ms 14 Jun 2024 189th AbhilashaTandon 703 155 15ms 21 Nov 2022 189th aksyristos 703 155 10ms 29 Nov 2022 189th b10011 🇫🇮 703 155 16ms 21 Jan 2023 189th Stockoh 🇫🇷 703 155 15ms 17 Oct 2024 193rd DialFrost 🇸🇬 699 156 11ms 21 Nov 2022 194th trist224 🇫🇷 694 157 10ms 29 Nov 2022 194th TaserTheFox 🇺🇸 694 157 16ms 20 Jan 2023 196th neihousaigaai 686 159 20ms 20 Feb 2022 196th brimstonetrader 686 159 17ms 8 Jan 2024 196th qpwoeirut 686 159 10ms 19 Nov 2025 196th Emutis 🇱🇹 686 159 16ms 1 Mar 2026 200th AdamMorris377 681 160 19ms 29 Aug 2024 201st glesnick 673 162 17ms 15 Jul 2022 201st m42km 673 162 28ms 3 Feb 2024 201st nilan425 673 162 16ms 4 Jul 2025 204th zlee1 669 163 16ms 27 Apr 2022 204th aglahir1 669 163 19ms 20 Jul 2022 204th FortuiteMan 🇫🇷 669 163 10ms 3 Sep 2023 204th tomh1012 669 163 17ms 27 days ago 208th yishayv 661 165 17ms 24 Jan 2023 209th za3k 657 166 11ms 8 Oct 2022 209th willdaspit 657 166 16ms 5 Aug 2023 211th bbakersmith 653 167 16ms 28 Jun 2022 212th msbranicky 649 168 15ms 5 Aug 2023 213th MichaelMBradley 🇨🇦 645 169 17ms 25 May 2022 213th try-except-try-accept 🇹🇭 645 169 15ms 27 Jun 2022 213th jameswmccarty 645 169 16ms 13 Sep 2024 216th Y0UR-U5ERNAME 641 170 15ms 22 Feb 2023 216th FoxFGC 641 170 16ms 30 Nov 2023 218th Eugen-str 637 171 16ms 1 Nov 2023 218th ridingqwerty 🇺🇸 637 171 13ms 20 May 2025 220th RZ781 623 175 9ms 27 Nov 2023 221st jhpaques 🇫🇷 619 176 18ms 27 Jul 2022 222nd Florian-Mt 616 177 16ms 15 Jul 2024 223rd jmerle 🇳🇱 612 178 17ms 15 Feb 2023 224th CheeseCake628 🇳🇴 606 180 17ms 11 Dec 2023 224th rustykitty 🇺🇸 606 180 10ms 31 Oct 2025 226th Trunksistor 🇫🇷 596 183 15ms 14 Apr 2022 227th jacksonhenry3 592 184 15ms 7 Mar 2023 228th S-Ruban 589 185 15ms 28 Feb 2023 229th EnisEfe0 583 187 15ms 11 May 2025 230th dranjohn 580 188 17ms 11 Sep 2023 231st guilhem-roy 🇫🇷 574 190 10ms 3 Mar 2022 232nd VictorFordham 571 191 11ms 14 Feb 2024 233rd dillon-duncando 565 193 15ms 22 Sep 2022 234th Omega65536 🇩🇪 556 196 10ms 29 Nov 2022 234th celiendonze 🇨🇭 556 196 16ms 5 Jul 2023 236th twocatsinatrenchcoat 553 197 17ms 5 Jun 2022 236th austinrwarner 553 197 18ms 12 Aug 2022 238th Starwort 🇬🇧 551 198 10ms 11 Nov 2022 239th AkashTandon167 548 199 17ms 5 Mar 2022 239th Andrey135296 548 199 9ms 25 Oct 2022 First Prev 161–240 of 274 Next Last