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?
ROT13 in all languages in chars. 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 Chars Time Submitted 720th edsrzf 🇳🇿 614 118 10ms 25 Aug 2025 722nd pardouin 🇫🇷 613 161 90ms 25 Apr 2025 723rd tayloia 🇬🇧 612 135 12ms 12 Jan 2025 724th firewoods1978 610 108 1ms 9 Jan 2025 724th Maashau 610 108 5ms 29 Nov 2025 726th tatzyr 🇯🇵 609 81 274ms 5 Mar 2025 727th edsrzf 🇳🇿 609 178 388ms 2 Mar 2025 728th KrausRaus 🇺🇸 608 136 13ms 3 Jan 2025 729th bac0id 607 138 447ms 10 Jan 2025 730th snoozingnewt 🇨🇦 605 118 438ms 2 Nov 2025 731st emgordon154 605 143 34ms 3 Jan 2025 732nd dokutan 604 120 2ms 5 Feb 2025 733rd Jacob385 604 139 363ms 28 Oct 2025 734th Protothor 603 137 16ms 11 Jun 2025 735th dokutan 603 166 3ms 4 Feb 2025 736th snoozingnewt 🇨🇦 603 181 297ms 2 Nov 2025 737th juliansiebert 🇩🇪 602 82 306ms 1 Mar 2025 738th Shanethegamer 🇺🇸 600 108 150ms 8 Jan 2025 738th pardouin 🇫🇷 600 108 150ms 29 Jul 2025 740th Herbert00709 🇵🇱 599 110 5ms 5 Jan 2025 741st luuumine 🇫🇷 599 140 65ms 8 Dec 2025 742nd Maximizer02 597 145 11ms 10 Jan 2025 743rd dbut2 🇦🇺 597 183 283ms 14 Jan 2025 744th ikskuh 595 139 10ms 27 Jun 2025 744th alexsave 595 139 13ms 7 Oct 2025 746th c0d3-4-F00d 🇩🇪 594 111 2ms 9 Jan 2025 746th wansacis 🇩🇪 594 111 2ms 30 Jan 2025 746th prestosilver 🇺🇸 594 111 2ms 18 Nov 2025 749th msbranicky 592 169 5ms 1 Jun 2025 750th Yewzir 🇧🇪 592 208 1,807ms 14 Nov 2025 751st Jay2k1 591 63 4ms 6 Nov 2025 752nd two-bad 🇬🇧 590 140 10ms 22 Feb 2025 753rd Yewzir 🇧🇪 590 142 476ms 6 Jan 2025 754th ikskuh 589 209 1,658ms 27 Jun 2025 755th madex 🇩🇪 588 112 2ms 4 Jan 2025 755th Mandrzejy 🇵🇱 588 112 1ms 5 Jan 2025 757th emgordon154 587 120 7ms 12 Jan 2025 758th snoozingnewt 🇨🇦 587 143 738ms 2 Nov 2025 759th Shanethegamer 🇺🇸 587 177 138ms 3 Jan 2025 759th WatMan77 587 177 132ms 27 May 2025 761st martindotexe 🇳🇴 587 186 274ms 16 May 2025 762nd dokutan 585 144 4ms 12 Feb 2025 763rd CheeseCake628 🇳🇴 584 97 11ms 20 May 2025 764th matricronia 583 113 2ms 1 Feb 2026 765th Shanethegamer 🇺🇸 583 143 1,318ms 4 Jan 2025 766th emgordon154 580 87 1,233ms 5 Jan 2025 767th mousetail 🇳🇱 579 59 24ms 6 Feb 2025 768th Natanaelel 🇸🇪 579 62 32ms 11 Jul 2025 769th Ripick 579 146 395ms 15 Feb 2025 770th gastropner 578 114 2ms 5 Jul 2025 770th jupj 🇫🇮 578 114 2ms 27 Aug 2025 772nd HaxSam 578 143 10ms 27 Jun 2025 773rd denkyuu1 577 79 4,829ms 8 days ago 774th emgordon154 577 93 2,537ms 2 Aug 2025 775th JunkIce 576 88 652ms 17 Jan 2025 776th aksyristos 570 145 10ms 11 Jan 2025 777th ikskuh 570 147 70ms 26 Sep 2025 778th HumanoidCPU 570 182 134ms 21 Nov 2025 779th blaztoma 🇱🇹 570 186 37ms 21 Sep 2025 780th CaedenHarper 🇨🇦 568 116 4ms 21 Nov 2025 780th jgbaldwinbrown 568 116 5ms 2 Feb 2026 782nd blaztoma 🇱🇹 563 117 4ms 21 Sep 2025 782nd warmCabin 563 117 5ms 31 Dec 2025 784th frankgraziano 563 128 6ms 23 Aug 2025 785th xyangst 562 147 12ms 14 Feb 2025 786th janAkali 🇷🇺 556 152 407ms 18 Jan 2025 787th Shanethegamer 🇺🇸 555 160 26ms 5 Jan 2025 788th bac0id 554 119 2ms 10 Jan 2025 789th rucin93 🇵🇱 554 184 182ms 5 Jan 2025 790th miabea73 553 152 479ms 26 Aug 2025 791st JOrE20 553 182 26ms 25 days ago 792nd snoozingnewt 🇨🇦 551 185 193ms 2 Nov 2025 793rd snoozingnewt 🇨🇦 550 83 212ms 27 Nov 2025 794th OllieBoyne 🇬🇧 550 103 11ms 9 Jan 2025 795th michelebastione 🇮🇹 550 130 444ms 25 Dec 2025 796th frankgraziano 549 132 2ms 16 May 2025 797th jkelly467 547 98 2,489ms 10 Dec 2025 798th Yewzir 🇧🇪 544 121 1ms 6 Jan 2025 799th Natanaelel 🇸🇪 542 39 2ms 9 Jan 2025 800th MeWhenI 🇻🇦 542 91 298ms 10 Jul 2025 First Prev 721–800 of 1,049 Next Last