The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 478th Natanaelel 🇸🇪 781 94 13ms 9 Dec 2023 478th LukeBridges 🇬🇧 781 94 15ms 2 Oct 2024 483rd Shanethegamer 🇺🇸 780 105 1,238ms 12 Dec 2022 484th Indivicivet 779 133 17ms 9 May 2022 484th QuincyNash 🇺🇸 779 133 15ms 2 Dec 2022 484th 2011-Chan-Ethan 779 133 15ms 16 Sep 2023 484th yuchuehw 779 133 14ms 3 Feb 2024 484th neel11235813 779 133 15ms 17 Mar 2024 484th joll05 🇸🇪 779 133 16ms 1 Oct 2025 484th Babafaba 779 133 16ms 23 Oct 2025 491st lynn 779 203 33ms 16 Jul 2023 492nd emgordon154 778 94 136ms 14 Nov 2024 492nd ovs-code 🇩🇪 778 94 187ms 17 Apr 2025 492nd rucin93 🇵🇱 778 94 158ms 13 Jun 2025 495th kg583 🇺🇸 778 129 87ms 10 Nov 2025 496th GolfingSuccess 🇬🇷 778 144 10ms 30 Jan 2025 497th GrayJoKing 🇦🇺 778 187 11ms 24 Feb 2026 497th edsrzf 🇳🇿 778 187 7ms 10 days ago 499th jwhear 🇺🇸 778 240 240ms 20 Mar 2023 500th Shanethegamer 🇺🇸 777 41 70ms 5 Dec 2024 501st Mukundan314 777 43 1,039ms 30 Dec 2025 502nd CatsAreFluffy 777 85 57ms 31 Jan 2023 503rd GolfingSuccess 🇬🇷 776 126 5ms 20 Aug 2024 504th CLOStrophobic 🇮🇹 776 133 6ms 19 Feb 2025 505th canissimia 🇦🇶 776 355 226ms 19 May 2023 506th primo-ppcg 🇹🇭 776 381 11ms 13 Aug 2025 507th canissimia 🇦🇶 775 585 61ms 17 Mar 2024 508th Shanethegamer 🇺🇸 774 174 2,769ms 4 Nov 2024 509th edsrzf 🇳🇿 774 206 484ms 25 Oct 2025 510th Heathcorp 🇦🇺 773 134 26ms 7 Oct 2022 510th madex 🇩🇪 773 134 23ms 9 Jul 2024 510th LostSyntax21 🇬🇧 773 134 24ms 2 Dec 2024 510th albanian-laundromat 773 134 17ms 12 Apr 2025 510th fkantelberg 773 134 13ms 19 Jul 2025 515th dmrichwa 🇺🇸 772 95 15ms 16 May 2022 515th junkondo-jp 772 95 11ms 4 Jun 2024 515th madeforlosers 772 95 10ms 5 Nov 2024 515th Lv0Sys 🇵🇱 772 95 16ms 6 Dec 2025 519th inventshah 772 152 1ms 29 Mar 2025 520th 77Tigers 772 242 216ms 10 Apr 2024 521st MeWhenI 🇻🇦 771 75 289ms 28 Jan 2023 521st SirBogman 🇺🇸 771 75 469ms 2 Feb 2024 523rd ovs-code 🇩🇪 771 106 987ms 27 Oct 2023 523rd alemelis 771 106 767ms 26 Aug 2024 525th edsrzf 🇳🇿 770 175 2,864ms 10 Jun 2025 526th namelessiw 770 207 524ms 10 Oct 2025 527th janbehrens 🇩🇪 768 135 27ms 1 Jul 2022 527th mwja 768 135 16ms 21 Aug 2024 529th ovs-code 🇩🇪 766 176 489ms 2 Mar 2022 530th ChiefChippy2 765 64 40ms 12 Feb 2022 530th GrayJoKing 🇦🇺 765 64 38ms 13 Feb 2022 532nd cbrt-x 765 173 140ms 11 Oct 2023 533rd Yax42 🇫🇷 764 96 13ms 21 Jan 2026 534th AlephSquirrel 763 108 653ms 21 Jan 2024 534th fuzzylojik-golf 🇺🇸 763 108 684ms 24 Jul 2025 536th jared-hughes 762 129 3ms 10 Apr 2022 536th adriweb 🇫🇷 762 129 2ms 3 Sep 2023 538th martinnorling 🇸🇪 762 136 31ms 15 Feb 2022 538th adoxography 762 136 15ms 20 Mar 2022 538th nullie 762 136 16ms 14 Jun 2022 538th AGoyet 762 136 15ms 17 Jul 2022 538th inverseLorentz 🇦🇺 762 136 22ms 21 Feb 2024 538th chartung17 762 136 15ms 20 Apr 2025 538th FlorianCassayre 🇫🇷 762 136 18ms 5 Aug 2025 538th Luke44565 762 136 17ms 10 Aug 2025 538th luuumine 🇫🇷 762 136 16ms 17 Oct 2025 538th Bmrl7 762 136 25ms 21 Dec 2025 548th AdrienHache 🇫🇷 761 180 456ms 1 Feb 2025 549th xsot 🇸🇬 759 110 5ms 10 Jun 2025 550th JDiLenarda 🇫🇷 759 171 1,396ms 25 Nov 2023 551st MeWhenI 🇻🇦 759 178 115ms 8 Mar 2023 552nd MeWhenI 🇻🇦 757 148 9ms 22 Dec 2024 553rd zacjl 757 155 2ms 24 Apr 2023 554th stackofbears 756 76 37ms 20 Sep 2023 555th jared-hughes 756 97 12ms 6 Apr 2022 555th trinityy-7 756 97 15ms 15 Mar 2024 555th hacker112 🇸🇪 756 97 11ms 24 Jun 2024 555th lifthrasiir 🇰🇷 756 97 11ms 23 Nov 2024 555th helbling 🇨🇭 756 97 15ms 24 Aug 2025 560th GrayJoKing 🇦🇺 756 109 677ms 16 Jan 2024 First Prev 481–560 of 1,191 Next Last