The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
ROT13 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 JOrE20 553 182 26ms 25 days ago 802nd Yewzir 🇧🇪 552 121 1ms 6 Jan 2025 803rd snoozingnewt 🇨🇦 551 185 193ms 2 Nov 2025 804th michelebastione 🇮🇹 550 130 444ms 25 Dec 2025 805th frankgraziano 549 132 2ms 16 May 2025 806th SB-945 543 120 11ms 5 Jan 2025 806th randolchance 543 120 24ms 20 May 2025 806th yokasuretsu 543 120 13ms 12 Jul 2025 806th Bmrl7 543 120 18ms 23 Nov 2025 810th not-a-pokemon 543 123 4ms 18 Apr 2025 811th dokutan 543 155 4ms 11 Feb 2025 812th Natanaelel 🇸🇪 542 39 2ms 9 Jan 2025 813th MeWhenI 🇻🇦 542 91 298ms 10 Jul 2025 814th Siri-chan 542 161 11ms 8 Jan 2025 815th dokutan 541 93 1,343ms 5 Feb 2025 816th CarsonChr 🇺🇸 541 132 422ms 5 Jan 2025 817th HumanoidCPU 540 189 198ms 1 Feb 2025 818th lukechampine 540 202 301ms 7 Jun 2025 819th ikskuh 539 124 1ms 27 Jun 2025 820th rbobillot 539 345 1,407ms 13 Jan 2025 821st shaneliu-zf 🇹🇼 538 101 2,621ms 30 May 2025 822nd JunkIce 538 121 11ms 12 Feb 2025 823rd ravnskjaer 🇩🇰 538 156 465ms 15 Dec 2025 824th pquline 534 122 18ms 15 Mar 2025 825th snoozingnewt 🇨🇦 530 159 3ms 2 Nov 2025 826th MeWhenI 🇻🇦 529 122 146ms 6 Jan 2025 827th vhoulbreque 🇫🇷 525 124 17ms 16 Feb 2025 828th msbranicky 525 138 2ms 4 Jan 2025 829th Shanethegamer 🇺🇸 524 96 1,327ms 1 Jan 2025 830th andrewl64 524 179 1,950ms 25 Sep 2025 831st msbranicky 524 208 360ms 6 Jan 2025 832nd cyrilboyer 🇫🇷 523 195 156ms 13 Jan 2025 833rd Mikey-Beep 🇬🇧 521 125 11ms 8 Jul 2025 834th DialFrost 🇸🇬 519 97 1,301ms 5 Jan 2025 835th iilegacyyii 518 129 2ms 16 Jan 2025 836th Schmitt-Very-Cool 518 162 527ms 3 Oct 2025 837th madex 🇩🇪 518 197 195ms 4 Jan 2025 838th olleicua 🇺🇸 517 64 39ms 9 Mar 2025 839th osNiko 🇧🇷 517 126 12ms 16 Aug 2025 840th MyXoToD 🇩🇪 516 169 10ms 20 May 2025 841st CaedenHarper 🇨🇦 514 139 415ms 16 Oct 2025 842nd JDiLenarda 🇫🇷 514 162 1,380ms 30 Jan 2026 843rd blaztoma 🇱🇹 514 196 27ms 21 Sep 2025 844th Bobini1 🇵🇱 513 127 17ms 15 Jan 2025 844th matsagad 513 127 35ms 16 Jan 2025 846th Mabeloid 🇳🇴 510 131 4ms 21 Oct 2025 847th Siri-chan 508 201 178ms 8 Jan 2025 848th JOrE20 507 127 123ms 4 Dec 2025 849th Shanethegamer 🇺🇸 506 141 54ms 2 Jan 2025 850th tjwrenn 505 129 11ms 27 Jan 2025 851st duckyluuk 🇳🇱 505 191 6ms 29 Jan 2026 852nd frankgraziano 505 210 40ms 16 May 2025 853rd madeforlosers 504 173 12ms 14 Jan 2025 854th alaaeelsayed 503 167 428ms 15 Jan 2025 855th balloffur 501 167 455ms 7 Dec 2025 856th Kacarott 🇦🇺 500 193 7ms 26 Apr 2025 857th aditsu 499 109 2,631ms 30 Nov 2025 858th jtaxen 497 131 49ms 27 Jan 2025 859th jameswmccarty 494 132 12ms 7 Mar 2025 860th HumanoidCPU 490 171 62ms 17 Jan 2025 861st amazingalek 🇳🇴 489 146 348ms 1 Jan 2026 862nd DanielSchmerber 488 172 466ms 9 Jan 2025 863rd snoozingnewt 🇨🇦 487 177 8ms 2 Nov 2025 864th JRaspass 🇬🇧 487 224 307ms 5 Jan 2025 865th nils-imhoff 487 253 1,647ms 27 Jun 2025 866th codewrite 🇬🇧 486 147 517ms 6 Jan 2026 867th HumanoidCPU 484 138 2ms 25 May 2025 868th Ailko 🇧🇪 483 135 29ms 17 Jan 2025 868th itljan30 483 135 12ms 26 Jan 2025 868th smilesformiles3 483 135 18ms 18 Jun 2025 871st gjoacorp 🇬🇧 481 174 451ms 4 Aug 2025 871st dokutan 481 174 60ms 13 Nov 2025 873rd dokutan 480 139 5ms 13 Nov 2025 874th snoozingnewt 🇨🇦 480 192 9ms 2 Nov 2025 875th emgordon154 477 140 5ms 20 Dec 2025 876th bpharaldsson 476 150 472ms 31 Jan 2026 877th snoozingnewt 🇨🇦 474 141 4ms 2 Nov 2025 878th snoozingnewt 🇨🇦 474 196 32ms 2 Nov 2025 879th snoozingnewt 🇨🇦 473 188 27ms 2 Nov 2025 880th HumanoidCPU 472 179 373ms 2 Feb 2025 First Prev 801–880 of 1,048 Next Last