The Calendar hole will go live in approximately 13 days. Why not try and solve it 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> 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 ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight 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 Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz 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 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 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Chars Time Submitted 321st MeWhenI 🇻🇦 798 229 41ms 2 Jul 2023 322nd tayloia 🇬🇧 797 92 10ms 10 Jan 2023 322nd voytxt 🇨🇿 797 92 10ms 28 Dec 2023 322nd olleicua 🇺🇸 797 92 10ms 12 Feb 2024 322nd targrik 797 92 10ms 3 Apr 2025 322nd fuzzylojik-golf 🇺🇸 797 92 10ms 19 Jul 2025 327th Steffan153 🇫🇮 797 131 3ms 29 Jan 2024 328th GrayJoKing 🇦🇺 796 40 63ms 13 Sep 2023 328th chunes3 🇺🇸 796 40 70ms 13 Sep 2023 328th Bubbler-4 796 40 69ms 13 Sep 2023 328th sisyphus-ppcg 🇦🇺 796 40 73ms 13 Sep 2023 328th gifti258 796 40 72ms 13 Sep 2023 328th ovs-code 🇩🇪 796 40 60ms 13 Sep 2023 328th GolfingSuccess 🇬🇷 796 40 69ms 15 Sep 2023 328th Steffan153 🇫🇮 796 40 76ms 17 Sep 2023 328th 4hg 🇺🇸 796 40 70ms 18 Sep 2023 328th primo-ppcg 🇹🇭 796 40 71ms 19 Sep 2023 328th MeWhenI 🇻🇦 796 40 72ms 6 Nov 2023 328th error256 796 40 67ms 5 May 2024 328th edsrzf 🇳🇿 796 40 64ms 25 Sep 2024 328th pardouin 🇫🇷 796 40 76ms 25 Sep 2024 328th sean-niemann 🇺🇸 796 40 65ms 9 Apr 2025 328th DialFrost 🇸🇬 796 40 64ms 9 Apr 2025 328th fuzzylojik-golf 🇺🇸 796 40 62ms 17 Sep 2025 328th JayXon 🇺🇸 796 40 72ms 4 Nov 2025 346th ovs-code 🇩🇪 796 312 458ms 1 Feb 2025 347th JRaspass 🇬🇧 795 51 6ms 12 Feb 2022 347th akshatj27 🇦🇶 795 51 5ms 12 Feb 2022 347th NewDefectus 🇮🇱 795 51 5ms 12 Feb 2022 347th ovs-code 🇩🇪 795 51 6ms 4 May 2023 351st verticallity 795 235 189ms 5 Apr 2022 352nd clockworknazo 793 79 19ms 14 Nov 2022 353rd primo-ppcg 🇹🇭 793 189 39ms 6 Jul 2022 354th nwellnhof 🇩🇪 792 73 346ms 3 Jun 2022 355th Waffle3z 792 124 3ms 8 Apr 2022 356th m-tkach 🇺🇦 792 235 57ms 6 Aug 2023 357th andersk 🇺🇸 792 236 196ms 1 Nov 2022 357th funnsam 🇭🇰 792 236 237ms 23 Oct 2023 359th jared-hughes 792 261 9ms 8 Jul 2024 360th Irratix 🇳🇱 791 95 12ms 7 May 2022 360th JunkIce 791 95 32ms 2 Dec 2024 360th luuumine 🇫🇷 791 95 16ms 7 Oct 2025 363rd GolfingSuccess 🇬🇷 791 132 6ms 29 Jan 2024 364th GolfingSuccess 🇬🇷 791 314 1,475ms 3 Feb 2025 365th pardouin 🇫🇷 790 103 1,778ms 9 Aug 2025 366th Vinterion 789 212 32ms 6 Oct 2024 366th edsrzf 🇳🇿 789 212 31ms 4 May 2025 368th primo-ppcg 🇹🇭 789 236 26ms 25 Jun 2022 369th prplz 🇦🇺 788 93 10ms 14 Feb 2022 369th primo-ppcg 🇹🇭 788 93 10ms 16 Feb 2022 369th dzshn 788 93 10ms 24 Aug 2022 369th eranws 788 93 9ms 13 Oct 2022 369th biocommando 🇫🇮 788 93 10ms 13 Mar 2024 369th BalaM314 788 93 10ms 7 Feb 2025 369th Andrey-Plotnikov 788 93 9ms 25 Jun 2025 369th KatieLG 🇬🇧 788 93 10ms 5 Oct 2025 377th KasperKivimaeki 🇫🇮 788 178 454ms 10 days ago 378th mousetail 🇳🇱 788 237 193ms 16 May 2024 379th adriweb 🇫🇷 786 125 13ms 12 Oct 2023 380th 2bular 785 44 3ms 21 Jun 2025 381st btnlq 785 131 22ms 30 Mar 2022 382nd GrayJoKing 🇦🇺 784 104 5ms 31 Aug 2023 383rd duckyluuk 🇳🇱 783 143 9ms 26 Feb 2025 384th KatieLG 🇬🇧 782 96 91ms 29 Jul 2024 385th MostParsingVex 782 149 1ms 3 Jan 2025 386th KrausRaus 🇺🇸 780 94 10ms 13 Feb 2022 386th SirBogman 🇺🇸 780 94 10ms 7 May 2022 386th iliazeus 780 94 29ms 4 Sep 2022 386th Natanaelel 🇸🇪 780 94 10ms 9 Dec 2023 386th LukeBridges 🇬🇧 780 94 10ms 2 Oct 2024 391st MeWhenI 🇻🇦 778 79 20ms 1 Nov 2023 392nd GolfingSuccess 🇬🇷 778 144 9ms 30 Jan 2025 393rd jwhear 🇺🇸 778 240 224ms 20 Mar 2023 394th Shanethegamer 🇺🇸 777 41 70ms 5 Dec 2024 395th GolfingSuccess 🇬🇷 776 126 5ms 20 Aug 2024 396th CLOStrophobic 🇮🇹 776 133 6ms 19 Feb 2025 397th canissimia 🇦🇶 776 355 236ms 19 May 2023 398th primo-ppcg 🇹🇭 776 381 11ms 13 Aug 2025 399th Shanethegamer 🇺🇸 775 105 986ms 12 Dec 2022 400th canissimia 🇦🇶 775 585 64ms 17 Mar 2024 First Prev 321–400 of 1,153 Next Last