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 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 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 Bytes Time Submitted 481st canissimia 🇦🇶 776 355 236ms 19 May 2023 482nd primo-ppcg 🇹🇭 776 381 11ms 13 Aug 2025 483rd Shanethegamer 🇺🇸 775 105 986ms 12 Dec 2022 484th canissimia 🇦🇶 775 585 64ms 17 Mar 2024 485th primo-ppcg 🇹🇭 774 48 24ms 15 Feb 2022 486th kg583 🇺🇸 774 129 226ms 10 Nov 2025 487th Shanethegamer 🇺🇸 774 174 4,349ms 4 Nov 2024 488th edsrzf 🇳🇿 774 206 438ms 25 Oct 2025 489th Heathcorp 🇦🇺 773 134 25ms 7 Oct 2022 489th madex 🇩🇪 773 134 24ms 9 Jul 2024 489th LostSyntax21 🇬🇧 773 134 24ms 2 Dec 2024 489th albanian-laundromat 773 134 16ms 12 Apr 2025 489th fkantelberg 773 134 18ms 19 Jul 2025 494th dmrichwa 🇺🇸 772 95 10ms 16 May 2022 494th junkondo-jp 772 95 10ms 4 Jun 2024 494th madeforlosers 772 95 10ms 5 Nov 2024 494th Lv0Sys 🇵🇱 772 95 10ms 12 days ago 498th inventshah 772 152 2ms 29 Mar 2025 499th 77Tigers 772 242 216ms 10 Apr 2024 500th MeWhenI 🇻🇦 771 75 298ms 28 Jan 2023 500th SirBogman 🇺🇸 771 75 419ms 2 Feb 2024 502nd ovs-code 🇩🇪 771 106 1,410ms 27 Oct 2023 502nd alemelis 771 106 978ms 26 Aug 2024 504th CatsAreFluffy 770 85 49ms 31 Jan 2023 505th edsrzf 🇳🇿 770 175 3,909ms 10 Jun 2025 506th namelessiw 770 207 446ms 10 Oct 2025 507th janbehrens 🇩🇪 767 135 25ms 1 Jul 2022 507th mwja 767 135 15ms 21 Aug 2024 509th ovs-code 🇩🇪 766 176 522ms 2 Mar 2022 510th Natanaelel 🇸🇪 765 53 33ms 12 Feb 2022 511th cbrt-x 765 173 142ms 11 Oct 2023 512th edsrzf 🇳🇿 764 96 12ms 13 Nov 2025 513th ChiefChippy2 763 64 34ms 12 Feb 2022 513th GrayJoKing 🇦🇺 763 64 40ms 13 Feb 2022 515th AlephSquirrel 763 108 745ms 21 Jan 2024 515th fuzzylojik-golf 🇺🇸 763 108 675ms 24 Jul 2025 517th jared-hughes 762 129 4ms 10 Apr 2022 517th adriweb 🇫🇷 762 129 2ms 3 Sep 2023 519th martinnorling 🇸🇪 761 136 29ms 15 Feb 2022 519th adoxography 761 136 18ms 20 Mar 2022 519th nullie 761 136 16ms 14 Jun 2022 519th AGoyet 761 136 16ms 17 Jul 2022 519th inverseLorentz 🇦🇺 761 136 20ms 21 Feb 2024 519th chartung17 761 136 16ms 20 Apr 2025 519th FlorianCassayre 🇫🇷 761 136 17ms 5 Aug 2025 519th Luke44565 761 136 17ms 10 Aug 2025 519th blaztoma 🇱🇹 761 136 16ms 15 Sep 2025 519th luuumine 🇫🇷 761 136 18ms 17 Oct 2025 529th xsot 🇸🇬 759 110 5ms 10 Jun 2025 530th JDiLenarda 🇫🇷 759 171 1,312ms 25 Nov 2023 531st MeWhenI 🇻🇦 759 178 114ms 8 Mar 2023 532nd AdrienHache 🇫🇷 759 180 398ms 1 Feb 2025 533rd MeWhenI 🇻🇦 757 148 9ms 22 Dec 2024 534th zacjl 757 155 2ms 24 Apr 2023 535th stackofbears 756 76 40ms 20 Sep 2023 536th jared-hughes 756 97 11ms 6 Apr 2022 536th trinityy-7 756 97 10ms 15 Mar 2024 536th hacker112 🇸🇪 756 97 9ms 24 Jun 2024 536th lifthrasiir 🇰🇷 756 97 9ms 23 Nov 2024 536th helbling 🇨🇭 756 97 10ms 24 Aug 2025 541st GrayJoKing 🇦🇺 756 109 537ms 16 Jan 2024 541st b-illy 🇬🇧 756 109 464ms 7 Sep 2024 541st snoozingnewt 🇨🇦 756 109 451ms 13 days ago 544th Waffle3z 756 130 3ms 6 Apr 2022 545th P-Quentin 🇫🇷 756 137 19ms 5 Aug 2022 545th nstearns96 🇬🇧 756 137 24ms 15 Dec 2022 545th mossprescott 756 137 11ms 19 Jan 2023 545th taesungh 756 137 16ms 15 Oct 2023 545th PyryL 🇫🇮 756 137 18ms 25 Aug 2024 550th MeWhenI 🇻🇦 756 154 13ms 26 Apr 2024 551st stefangimmillaro 756 247 223ms 13 Nov 2023 552nd marshallward 🇺🇸 755 242 40ms 7 Sep 2022 553rd Mandrzejy 🇵🇱 754 186 63ms 9 Apr 2024 554th lifthrasiir 🇰🇷 754 274 7ms 19 Dec 2024 555th sean-niemann 🇺🇸 750 124 114ms 2 Jul 2025 556th michelebastione 🇮🇹 750 138 16ms 19 Feb 2022 556th knutae 🇳🇴 750 138 15ms 8 Mar 2022 556th RDShah 750 138 32ms 15 May 2022 556th SB-945 750 138 14ms 11 Jan 2024 556th ImpressedByRocks 750 138 16ms 10 Oct 2024 First Prev 481–560 of 1,157 Next Last