The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them 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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> ALGOL 68 ArkScript 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 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Lily 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 Calendar Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz Continued Fractions 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 Multitap Input 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 Alphabetic Numbers Apéry’s Constant Binary Lambda Calculus Connect Four Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 801st neihousaigaai 652 159 20ms 20 Feb 2022 801st brimstonetrader 652 159 17ms 8 Jan 2024 801st qpwoeirut 652 159 10ms 19 Nov 2025 801st Emutis 🇱🇹 652 159 16ms 1 Mar 2026 805th WalrusesAreAwesome 652 210 394ms 16 Feb 2026 806th UnderKoen 🇳🇱 652 284 13ms 26 Aug 2025 807th TehFlaminTaco 649 113 33ms 10 Nov 2022 808th not-a-pokemon 649 181 1ms 5 Jul 2025 809th Shanethegamer 🇺🇸 648 151 19ms 14 Aug 2024 810th AdamMorris377 648 160 19ms 29 Aug 2024 811th Shanethegamer 🇺🇸 646 152 2ms 12 Apr 2024 812th CatsAreFluffy 646 205 142ms 31 Mar 2023 813th CaedenHarper 🇨🇦 646 212 360ms 17 Oct 2025 814th SirBogman 🇺🇸 646 283 41ms 31 Dec 2023 815th jupj 🇫🇮 645 182 2ms 16 Sep 2022 815th jared-hughes 645 182 2ms 9 Jan 2023 817th brimstonetrader 643 206 148ms 21 Jan 2024 818th DialFrost 🇸🇬 642 99 1,966ms 5 Sep 2025 819th glesnick 640 162 17ms 15 Jul 2022 819th m42km 640 162 28ms 3 Feb 2024 819th nilan425 640 162 16ms 4 Jul 2025 822nd MiffOttah 640 214 427ms 28 Nov 2024 823rd janbehrens 🇩🇪 639 128 1,626ms 23 Feb 2022 824th Yewzir 🇧🇪 639 211 484ms 9 Feb 2023 825th Florian-Mt 638 115 11ms 27 Oct 2023 826th NickTheEASDude 🇺🇸 638 154 3ms 18 Sep 2024 827th DialFrost 🇸🇬 637 287 284ms 29 May 2025 828th DialFrost 🇸🇬 636 77 36ms 25 Dec 2024 829th zlee1 636 163 16ms 27 Apr 2022 829th aglahir1 636 163 19ms 20 Jul 2022 829th FortuiteMan 🇫🇷 636 163 10ms 3 Sep 2023 829th tomh1012 636 163 17ms 27 days ago 833rd edsrzf 🇳🇿 634 175 125ms 10 Jun 2025 834th jared-hughes 634 221 2,874ms 9 Jan 2023 835th DialFrost 🇸🇬 633 147 120ms 4 Jul 2025 836th GolfingSuccess 🇬🇷 631 163 120ms 29 Jul 2025 837th CaedenHarper 🇨🇦 630 101 2,081ms 23 Oct 2025 838th Yewzir 🇧🇪 629 397 2,016ms 15 Nov 2025 839th stefangimmillaro 628 133 5ms 2 Jul 2023 840th yishayv 628 165 17ms 24 Jan 2023 841st dokutan 627 190 201ms 12 Jul 2024 842nd JRaspass 🇬🇧 626 292 324ms 18 May 2022 843rd SirBogman 🇺🇸 625 92 34ms 23 Apr 2022 844th MeWhenI 🇻🇦 625 117 164ms 3 Aug 2024 845th JunkIce 624 132 471ms 3 Dec 2024 846th za3k 624 166 11ms 8 Oct 2022 846th willdaspit 624 166 16ms 5 Aug 2023 848th madex 🇩🇪 624 188 1ms 10 Apr 2022 849th targrik 623 134 5ms 14 Aug 2025 850th elPossenreisser 623 220 400ms 6 May 2022 851st FlyingPenguin223 622 158 3ms 20 Dec 2024 851st Beariish 622 158 2ms 27 Mar 2025 853rd bbakersmith 621 167 16ms 28 Jun 2022 854th olivermrose 🇺🇸 620 79 37ms 15 Apr 2022 855th msbranicky 617 168 15ms 5 Aug 2023 856th annaproxy 617 222 400ms 29 Mar 2022 857th sean-niemann 🇺🇸 616 102 2ms 6 Jun 2023 858th emgordon154 616 219 755ms 28 May 2025 859th GolfingSuccess 🇬🇷 615 196 128ms 28 Nov 2025 860th janAkali 🇷🇺 615 208 412ms 9 Oct 2024 861st adlerzei 614 223 408ms 5 May 2022 862nd MichaelMBradley 🇨🇦 613 169 17ms 25 May 2022 862nd try-except-try-accept 🇹🇭 613 169 15ms 27 Jun 2022 862nd jameswmccarty 613 169 16ms 13 Sep 2024 865th efgen 611 120 12ms 28 Dec 2023 866th wackbyte 611 306 263ms 7 Dec 2023 867th Y0UR-U5ERNAME 610 170 15ms 22 Feb 2023 867th FoxFGC 610 170 16ms 30 Nov 2023 869th msbranicky 609 300 273ms 31 Aug 2023 870th Eugen-str 606 171 16ms 1 Nov 2023 870th ridingqwerty 🇺🇸 606 171 13ms 20 May 2025 872nd Shanethegamer 🇺🇸 604 232 2,852ms 16 Feb 2022 873rd RockOfStone 603 163 2ms 14 Mar 2024 874th emgordon154 603 310 274ms 6 Mar 2025 875th bac0id 602 233 67ms 27 Jun 2024 876th dokutan 601 122 12ms 5 Jun 2025 877th MeWhenI 🇻🇦 600 174 5ms 15 Oct 2023 878th emgordon154 600 414 1,462ms 4 Oct 2025 879th RobertHoeh 599 225 2,800ms 18 Dec 2025 880th janbehrens 🇩🇪 599 266 418ms 26 Feb 2022 First Prev 801–880 of 1,192 Next Last
