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 719th fgrosshans 🇫🇷 596 126 12ms 17 Jul 2024 719th NickTheEASDude 🇺🇸 596 126 18ms 21 Aug 2024 719th Pyroan 596 126 16ms 13 Mar 2025 724th MaxElf999 591 127 16ms 10 Nov 2022 724th DrakeSeteraO 591 127 24ms 28 Oct 2025 726th Shanethegamer 🇺🇸 591 134 82ms 4 Jun 2025 727th emgordon154 589 137 22ms 29 Jul 2025 728th pschmid0 🇺🇸 588 142 5ms 17 Oct 2022 729th fourth-bit 587 128 15ms 18 Nov 2022 729th Command-Master 587 128 102ms 29 Sep 2023 729th mathisfun271 587 128 35ms 13 Feb 2024 732nd adoxography 586 68 35ms 20 Mar 2022 733rd mwja 586 125 10ms 22 Aug 2024 734th 0xjac 🇨🇭 586 312 271ms 8 Jun 2025 735th Shanethegamer 🇺🇸 584 99 338ms 20 Apr 2022 736th jared-hughes 584 103 61ms 18 Jul 2022 737th stefangimmillaro 584 190 104ms 22 Oct 2022 738th KatieLG 🇬🇧 584 231 227ms 27 days ago 739th Kacarott 🇦🇺 582 114 950ms 4 Feb 2025 740th eiburns 582 126 9ms 28 Feb 2022 740th tomh1012 582 126 10ms 4 Mar 2022 740th Vaekor 582 126 9ms 28 Jul 2023 740th iczelia 🇩🇪 582 126 10ms 11 Oct 2025 744th andre-lameirinhas 🇵🇹 582 129 16ms 29 Jul 2022 744th Mikey-Beep 🇬🇧 582 129 17ms 6 Oct 2022 744th cros107 🇦🇺 582 129 14ms 25 May 2024 744th cubed-guy 582 129 16ms 9 Jun 2024 744th wuduculfre 582 129 10ms 22 Jul 2025 749th Phil-RGOMEGA 581 169 2ms 30 Aug 2023 750th dokutan 579 101 121ms 20 Sep 2024 751st jared-hughes 578 69 36ms 10 Sep 2022 752nd CedricGebistorf 578 130 17ms 16 Mar 2022 753rd Mabeloid 🇳🇴 578 170 3ms 29 Sep 2024 753rd frosster 578 170 2ms 26 Mar 2025 755th Aurel300 🇨🇭 577 324 211ms 3 Jun 2024 756th MeWhenI 🇻🇦 576 234 492ms 19 Aug 2022 757th aliakseikalosha 574 238 358ms 16 Jul 2025 758th acollett89 573 128 10ms 4 Aug 2025 759th amollberg 🇸🇪 573 131 17ms 15 Feb 2022 759th BREMAUCY 🇫🇷 573 131 18ms 26 Jul 2023 759th vishwathg 573 131 16ms 25 Jul 2025 759th InigoK 🇺🇸 573 131 11ms 30 Aug 2025 763rd SirBogman 🇺🇸 572 116 509ms 16 Jan 2024 763rd commandblockguy 🇺🇸 572 116 603ms 1 Sep 2025 765th edsrzf 🇳🇿 570 70 38ms 4 Sep 2025 766th emgordon154 570 143 8ms 23 Dec 2024 767th mikehanus 569 132 16ms 21 Nov 2023 767th logvp 569 132 15ms 28 Dec 2023 769th arjanadriaanse 🇳🇱 568 50 5ms 23 Feb 2022 770th Indivicivet 565 133 16ms 9 May 2022 770th QuincyNash 🇺🇸 565 133 17ms 2 Dec 2022 770th joll05 🇸🇪 565 133 15ms 1 Oct 2025 773rd aposteriorist 🇨🇦 562 240 550ms 28 Feb 2022 774th Heathcorp 🇦🇺 561 134 25ms 7 Oct 2022 774th madex 🇩🇪 561 134 24ms 9 Jul 2024 774th LostSyntax21 🇬🇧 561 134 24ms 2 Dec 2024 777th Shanethegamer 🇺🇸 561 184 11ms 4 Oct 2024 778th Shanethegamer 🇺🇸 560 149 4ms 2 Jul 2023 779th targrik 559 327 270ms 3 Jul 2025 780th janbehrens 🇩🇪 556 135 25ms 1 Jul 2022 780th mwja 556 135 15ms 21 Aug 2024 782nd FlorianCassayre 🇫🇷 555 132 9ms 18 Sep 2022 783rd emgordon154 554 72 38ms 20 Nov 2024 783rd Lv0Sys 🇵🇱 554 72 54ms 12 days ago 785th destofr 554 231 340ms 30 Dec 2022 786th msbranicky 553 338 255ms 6 Oct 2023 787th martinnorling 🇸🇪 552 136 29ms 15 Feb 2022 787th adoxography 552 136 18ms 20 Mar 2022 787th nullie 552 136 16ms 14 Jun 2022 787th AGoyet 552 136 16ms 17 Jul 2022 787th inverseLorentz 🇦🇺 552 136 20ms 21 Feb 2024 787th HumanoidCPU 552 136 9ms 29 Sep 2024 787th chartung17 552 136 16ms 20 Apr 2025 787th Luke44565 552 136 17ms 10 Aug 2025 787th blaztoma 🇱🇹 552 136 16ms 15 Sep 2025 796th msbranicky 552 244 4,370ms 9 Jan 2025 797th inventshah 551 122 2,842ms 7 Nov 2022 798th iczelia 🇩🇪 550 212 1ms 11 Oct 2025 799th keelimeguy 🇺🇸 550 255 2,855ms 5 Nov 2023 799th yeminghan2021 550 255 78ms 2 Feb 2025 First Prev 721–800 of 1,153 Next Last