The Calendar hole will go live in approximately 11 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 881st acollett89 573 128 10ms 4 Aug 2025 882nd emgordon154 570 143 8ms 23 Dec 2024 883rd arjanadriaanse 🇳🇱 568 50 5ms 23 Feb 2022 884th TheZwierzLF 🇵🇱 568 86 47ms 4 hours ago 885th Mabeloid 🇳🇴 568 145 465ms 4 May 2025 886th Trunksistor 🇫🇷 566 183 17ms 14 Apr 2022 887th jacksonhenry3 563 184 15ms 7 Mar 2023 888th akiratee 562 87 40ms 20 Oct 2025 889th aposteriorist 🇨🇦 562 240 550ms 28 Feb 2022 890th Shanethegamer 🇺🇸 561 184 11ms 4 Oct 2024 891st Shanethegamer 🇺🇸 560 149 4ms 2 Jul 2023 892nd S-Ruban 560 185 17ms 28 Feb 2023 893rd targrik 559 327 270ms 3 Jul 2025 894th Stockoh 🇫🇷 557 148 523ms 24 Jun 2024 895th FlorianCassayre 🇫🇷 555 132 9ms 18 Sep 2022 896th EnisEfe0 554 187 15ms 11 May 2025 897th iczelia 🇩🇪 554 212 1ms 11 Oct 2025 898th destofr 554 231 340ms 30 Dec 2022 899th msbranicky 553 338 255ms 6 Oct 2023 900th dokutan 552 148 437ms 14 Sep 2024 901st msbranicky 552 244 4,370ms 9 Jan 2025 902nd dranjohn 551 188 17ms 11 Sep 2023 903rd keelimeguy 🇺🇸 550 255 2,855ms 5 Nov 2023 903rd yeminghan2021 550 255 78ms 2 Feb 2025 905th annaproxy 549 89 33ms 14 Sep 2023 906th GolfingSuccess 🇬🇷 549 114 2ms 16 Oct 2024 907th c0d3-4-F00d 🇩🇪 549 214 2ms 24 Feb 2022 908th KatieLG 🇬🇧 548 74 5ms 19 Mar 2022 909th zakariamouhid 547 134 10ms 11 May 2023 910th guilhem-roy 🇫🇷 545 190 10ms 3 Mar 2022 911th aksyristos 543 90 32ms 8 Feb 2023 912th VictorFordham 542 191 10ms 14 Feb 2024 913th codewrite 🇬🇧 542 252 380ms 13 May 2025 914th MeWhenI 🇻🇦 540 64 2ms 15 Feb 2022 915th Shanethegamer 🇺🇸 540 116 2ms 5 Nov 2022 916th bac0id 539 218 1ms 27 Jun 2024 917th hjcafaroUC 539 260 3,154ms 20 Aug 2022 918th msbranicky 539 267 2ms 12 Aug 2023 919th dillon-duncando 537 193 16ms 22 Sep 2022 920th KatieLG-Transpiler 🇬🇧 535 154 423ms 16 Aug 2024 921st snoozingnewt 🇨🇦 534 253 107ms 8 Oct 2025 922nd MeWhenI 🇻🇦 533 76 5ms 16 Apr 2023 923rd MeWhenI 🇻🇦 533 208 99ms 16 Oct 2022 924th m42km 532 155 474ms 9 Feb 2024 925th IlkkaTakala 531 264 2,747ms 20 Dec 2023 926th KatieLG 🇬🇧 531 470 1,882ms 21 Nov 2025 927th codewrite 🇬🇧 530 345 266ms 16 Jun 2025 928th Omega65536 🇩🇪 528 196 9ms 29 Nov 2022 928th celiendonze 🇨🇭 528 196 16ms 5 Jul 2023 930th MeWhenI 🇻🇦 528 317 32ms 6 Jun 2023 931st varhammer 🇷🇺 526 196 5ms 13 Dec 2023 932nd twocatsinatrenchcoat 526 197 18ms 5 Jun 2022 932nd austinrwarner 526 197 17ms 12 Aug 2022 934th warmCabin 526 223 2ms 15 Apr 2022 935th MeWhenI 🇻🇦 523 139 787ms 15 Sep 2025 936th Starwort 🇬🇧 523 198 10ms 11 Nov 2022 937th Shanethegamer 🇺🇸 522 225 2ms 15 Feb 2022 938th AkashTandon167 520 199 18ms 5 Mar 2022 938th Andrey135296 520 199 10ms 25 Oct 2022 938th roguh 🇬🇹 520 199 10ms 8 Jan 2024 938th lhulinsky 520 199 17ms 21 Oct 2024 942nd MeWhenI 🇻🇦 520 246 363ms 27 Jul 2024 943rd postie77 520 263 336ms 19 May 2023 944th MeWhenI 🇻🇦 519 255 150ms 13 Feb 2022 945th ovs-code 🇩🇪 519 398 9ms 8 Jul 2024 946th jtaxen 515 201 9ms 18 Apr 2024 947th snoozingnewt 🇨🇦 514 181 133ms 22 Oct 2025 948th nephila-nacrea 🇬🇧 513 79 5ms 20 Feb 2022 949th Sciman101 512 192 2ms 27 Mar 2025 950th error256 511 51 3ms 6 May 2024 951st MeWhenI 🇻🇦 509 367 202ms 15 Feb 2022 952nd krcs 🇵🇱 508 204 21ms 23 Jan 2023 952nd kurkale6ka 508 204 10ms 4 days ago 954th Yewzir 🇧🇪 505 63 69ms 11 Mar 2024 955th namcartoon06 504 278 2,720ms 30 Jun 2023 956th shibacho 🇯🇵 503 206 14ms 30 Nov 2022 957th MeWhenI 🇻🇦 503 370 28ms 14 Feb 2022 958th adamnielson42 🇺🇸 502 146 9ms 2 Jun 2023 959th nyoshe 502 234 2ms 4 Jul 2023 960th dokutan 501 146 147ms 14 Sep 2024 First Prev 881–960 of 1,158 Next Last