The Calendar hole will go live in approximately 4 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 641st not-a-pokemon 644 181 1ms 5 Jul 2025 642nd brimstonetrader 643 206 148ms 21 Jan 2024 643rd betaveros 642 117 16ms 31 Dec 2022 643rd DayDun 🇸🇪 642 117 21ms 22 Jan 2023 643rd KasperKivimaeki 🇫🇮 642 117 14ms 1 Jul 2025 643rd bzijlema 🇳🇱 642 117 16ms 12 Nov 2025 647th ovs-code 🇩🇪 640 105 1,160ms 27 Oct 2023 648th jupj 🇫🇮 640 182 2ms 16 Sep 2022 648th jared-hughes 640 182 2ms 9 Jan 2023 650th Yewzir 🇧🇪 639 211 492ms 9 Feb 2023 651st MiffOttah 639 214 407ms 28 Nov 2024 652nd Florian-Mt 638 115 10ms 27 Oct 2023 653rd bizy-coder 637 118 38ms 6 Aug 2023 653rd Rubiksmath 637 118 40ms 7 Aug 2023 653rd StefanHabel 🇨🇦 637 118 15ms 4 Sep 2023 656th NickTheEASDude 🇺🇸 637 154 3ms 18 Sep 2024 657th DialFrost 🇸🇬 637 287 258ms 29 May 2025 658th edsrzf 🇳🇿 634 175 101ms 10 Jun 2025 659th jared-hughes 634 221 2,403ms 9 Jan 2023 660th Frowny 631 119 179ms 13 Feb 2022 660th prplz 🇦🇺 631 119 17ms 13 Feb 2022 660th bricknellj 631 119 20ms 14 Feb 2023 660th edsrzf 🇳🇿 631 119 22ms 4 Oct 2025 660th Natanaelel 🇸🇪 631 119 16ms 13 Nov 2025 665th GolfingSuccess 🇬🇷 631 163 120ms 29 Jul 2025 666th emgordon154 629 93 120ms 7 Aug 2024 667th Yewzir 🇧🇪 629 397 2,450ms 15 Nov 2025 668th stefangimmillaro 628 133 5ms 2 Jul 2023 669th dokutan 627 190 141ms 12 Jul 2024 670th TobyBoyne 🇬🇧 626 120 16ms 18 Feb 2022 670th OllieBoyne 🇬🇧 626 120 15ms 18 Feb 2022 670th petroselo 626 120 190ms 12 Apr 2022 670th inventshah 626 120 15ms 15 Nov 2022 670th CaedenHarper 🇨🇦 626 120 17ms 27 Dec 2024 675th JRaspass 🇬🇧 626 292 299ms 18 May 2022 676th SirBogman 🇺🇸 625 92 34ms 23 Apr 2022 677th ChiefChippy2 624 64 41ms 12 Feb 2022 677th GrayJoKing 🇦🇺 624 64 41ms 13 Feb 2022 679th MeWhenI 🇻🇦 623 108 427ms 15 Feb 2023 680th targrik 623 134 5ms 14 Aug 2025 681st ovs-code 🇩🇪 622 94 136ms 17 Apr 2025 681st rucin93 🇵🇱 622 94 136ms 13 Jun 2025 683rd primo-ppcg 🇹🇭 621 121 20ms 4 Mar 2022 683rd EnTerr 621 121 22ms 8 Sep 2024 683rd Bulmenisaurus 621 121 12ms 3 Oct 2025 683rd ryyyn 🇺🇸 621 121 16ms 28 Oct 2025 687th Beariish 621 158 3ms 27 Mar 2025 688th elPossenreisser 621 220 358ms 6 May 2022 689th madex 🇩🇪 620 188 1ms 10 Apr 2022 690th Shanethegamer 🇺🇸 617 184 42ms 6 Sep 2024 691st ahmetdemirag 🇨🇾 616 122 14ms 15 Jul 2024 691st Lv0Sys 🇵🇱 616 122 23ms 20 days ago 693rd emgordon154 616 219 703ms 28 May 2025 694th annaproxy 616 222 347ms 29 Mar 2022 695th janAkali 🇷🇺 615 208 349ms 9 Oct 2024 696th olivermrose 🇺🇸 614 65 38ms 15 Apr 2022 697th sean-niemann 🇺🇸 614 102 2ms 6 Jun 2023 698th AlephSquirrel 614 108 745ms 21 Jan 2024 699th adlerzei 613 223 353ms 5 May 2022 700th GolfingSuccess 🇬🇷 612 196 116ms 28 Nov 2025 701st efgen 611 120 11ms 28 Dec 2023 702nd jared-hughes 611 123 16ms 8 Sep 2022 702nd quimey 611 123 17ms 4 Jul 2023 702nd htareque 611 123 11ms 17 Oct 2023 705th wackbyte 611 306 250ms 7 Dec 2023 706th msbranicky 609 300 287ms 31 Aug 2023 707th scpchicken 🇵🇼 605 66 45ms 13 Feb 2022 708th Shanethegamer 🇺🇸 604 232 2,483ms 16 Feb 2022 709th bizy-coder 603 110 423ms 16 Jan 2024 709th MeWhenI 🇻🇦 603 110 592ms 24 May 2024 709th CaedenHarper 🇨🇦 603 110 450ms 27 Dec 2024 712th emgordon154 603 310 259ms 6 Mar 2025 713th RockOfStone 602 163 2ms 14 Mar 2024 714th bac0id 602 233 66ms 27 Jun 2024 715th RYNO8 601 125 16ms 16 Aug 2022 716th MeWhenI 🇻🇦 600 174 5ms 15 Oct 2023 717th emgordon154 600 414 481ms 4 Oct 2025 718th RobertHoeh 599 225 3,109ms 8 days ago 719th janbehrens 🇩🇪 599 266 467ms 26 Feb 2022 719th cbrt-x 599 266 428ms 6 May 2022 First Prev 641–720 of 1,156 Next Last
