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 800th aglahir1 635 163 19ms 20 Jul 2022 800th FortuiteMan 🇫🇷 635 163 9ms 3 Sep 2023 803rd DialFrost 🇸🇬 634 77 34ms 25 Dec 2024 804th edsrzf 🇳🇿 634 175 101ms 10 Jun 2025 805th jared-hughes 634 221 3,007ms 9 Jan 2023 806th DialFrost 🇸🇬 633 147 115ms 4 Jul 2025 807th GolfingSuccess 🇬🇷 631 163 120ms 29 Jul 2025 808th Yewzir 🇧🇪 629 397 2,450ms 15 Nov 2025 809th stefangimmillaro 628 133 5ms 2 Jul 2023 810th yishayv 628 165 18ms 24 Jan 2023 810th Aquateraneal 628 165 15ms 12 Aug 2025 812th dokutan 627 190 141ms 12 Jul 2024 813th JRaspass 🇬🇧 626 292 299ms 18 May 2022 814th SirBogman 🇺🇸 625 92 34ms 23 Apr 2022 815th MeWhenI 🇻🇦 625 117 139ms 3 Aug 2024 816th JunkIce 624 132 438ms 3 Dec 2024 817th za3k 624 166 13ms 8 Oct 2022 817th willdaspit 624 166 15ms 5 Aug 2023 819th madex 🇩🇪 624 188 1ms 10 Apr 2022 820th targrik 623 134 5ms 14 Aug 2025 821st albanian-laundromat 622 117 2,025ms 22 Sep 2025 822nd FlyingPenguin223 622 158 2ms 20 Dec 2024 822nd Beariish 622 158 2ms 27 Mar 2025 824th elPossenreisser 621 220 358ms 6 May 2022 825th bbakersmith 620 167 14ms 28 Jun 2022 826th olivermrose 🇺🇸 618 79 39ms 15 Apr 2022 827th msbranicky 616 168 16ms 5 Aug 2023 828th emgordon154 616 219 703ms 28 May 2025 829th annaproxy 616 222 347ms 29 Mar 2022 830th janAkali 🇷🇺 615 208 349ms 9 Oct 2024 831st sean-niemann 🇺🇸 614 102 2ms 6 Jun 2023 832nd MichaelMBradley 🇨🇦 613 169 16ms 25 May 2022 832nd try-except-try-accept 🇹🇭 613 169 17ms 27 Jun 2022 832nd jameswmccarty 613 169 16ms 13 Sep 2024 835th adlerzei 613 223 353ms 5 May 2022 836th GolfingSuccess 🇬🇷 612 196 116ms 20 days ago 837th efgen 611 120 11ms 28 Dec 2023 838th wackbyte 611 306 250ms 7 Dec 2023 839th Y0UR-U5ERNAME 609 170 17ms 22 Feb 2023 839th FoxFGC 609 170 16ms 30 Nov 2023 841st msbranicky 609 300 287ms 31 Aug 2023 842nd Eugen-str 606 171 14ms 1 Nov 2023 842nd ridingqwerty 🇺🇸 606 171 16ms 20 May 2025 844th Shanethegamer 🇺🇸 604 232 3,300ms 16 Feb 2022 845th RockOfStone 603 163 2ms 14 Mar 2024 846th emgordon154 603 310 259ms 6 Mar 2025 847th andrewjc2000 602 172 15ms 19 Aug 2025 848th bac0id 602 233 75ms 27 Jun 2024 849th dokutan 601 122 9ms 5 Jun 2025 850th MeWhenI 🇻🇦 600 174 5ms 15 Oct 2023 851st emgordon154 600 414 481ms 4 Oct 2025 852nd janbehrens 🇩🇪 599 266 467ms 26 Feb 2022 852nd cbrt-x 599 266 428ms 6 May 2022 854th CaedenHarper 🇨🇦 596 82 36ms 13 Sep 2025 855th RZ781 592 175 10ms 27 Nov 2023 856th genmeblog 591 169 8ms 11 Dec 2023 857th pschmid0 🇺🇸 588 142 5ms 17 Oct 2022 858th jhpaques 🇫🇷 588 176 16ms 27 Jul 2022 859th RobertHoeh 588 229 4,098ms 7 Oct 2025 860th mwja 586 125 10ms 22 Aug 2024 861st 0xjac 🇨🇭 586 312 271ms 8 Jun 2025 862nd Florian-Mt 585 177 15ms 15 Jul 2024 863rd Shanethegamer 🇺🇸 584 99 338ms 20 Apr 2022 864th jared-hughes 584 103 61ms 18 Jul 2022 865th KatieLG 🇬🇧 584 141 457ms 17 Aug 2024 866th stefangimmillaro 584 190 104ms 22 Oct 2022 867th KatieLG 🇬🇧 584 231 227ms 26 days ago 868th eiburns 582 126 9ms 28 Feb 2022 868th tomh1012 582 126 10ms 4 Mar 2022 868th Vaekor 582 126 9ms 28 Jul 2023 868th iczelia 🇩🇪 582 126 10ms 11 Oct 2025 872nd jmerle 🇳🇱 582 178 17ms 15 Feb 2023 873rd Phil-RGOMEGA 581 169 2ms 30 Aug 2023 874th Mabeloid 🇳🇴 578 170 3ms 29 Sep 2024 874th frosster 578 170 2ms 26 Mar 2025 876th Aurel300 🇨🇭 577 324 211ms 3 Jun 2024 877th MeWhenI 🇻🇦 576 234 492ms 19 Aug 2022 878th CheeseCake628 🇳🇴 575 180 17ms 11 Dec 2023 878th rustykitty 🇺🇸 575 180 12ms 31 Oct 2025 880th aliakseikalosha 574 238 358ms 16 Jul 2025 First Prev 801–880 of 1,157 Next Last
