The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 721st KasperKivimaeki 🇫🇮 627 114 410ms 5 Jan 2025 722nd Shanethegamer 🇺🇸 627 138 8ms 5 Jan 2025 723rd weliveinhell 🇭🇹 626 132 10ms 26 Jun 2025 724th grey0ut 625 79 323ms 9 Jan 2025 725th DialFrost 🇸🇬 623 135 385ms 24 Sep 2025 726th Shanethegamer 🇺🇸 622 114 470ms 6 Jan 2025 727th the-zammers 622 167 152ms 2 Feb 2025 728th Mandrzejy 🇵🇱 621 135 460ms 5 Jan 2025 729th prestosilver 🇺🇸 621 136 373ms 18 Dec 2025 730th jerrandolph 621 176 276ms 23 Sep 2025 731st MostParsingVex 619 100 201ms 7 Jan 2025 732nd tomh1012 617 116 535ms 21 days ago 733rd LukeBridges 🇬🇧 617 134 11ms 8 Jan 2025 734th szymex73 🇵🇱 616 107 2ms 17 Jan 2025 734th Efgeen 🇸🇪 616 107 4ms 17 Nov 2025 736th pardouin 🇫🇷 613 161 90ms 25 Apr 2025 737th tayloia 🇬🇧 612 135 13ms 12 Jan 2025 738th firewoods1978 610 108 1ms 9 Jan 2025 738th Maashau 610 108 5ms 29 Nov 2025 740th tatzyr 🇯🇵 609 81 274ms 5 Mar 2025 741st edsrzf 🇳🇿 609 178 388ms 2 Mar 2025 742nd KrausRaus 🇺🇸 608 136 11ms 3 Jan 2025 743rd bac0id 607 138 447ms 10 Jan 2025 744th snoozingnewt 🇨🇦 606 118 438ms 2 Nov 2025 745th dokutan 606 166 3ms 4 Feb 2025 746th Jacob385 605 139 363ms 28 Oct 2025 747th emgordon154 605 143 34ms 3 Jan 2025 748th Protothor 603 137 10ms 11 Jun 2025 749th snoozingnewt 🇨🇦 603 181 297ms 2 Nov 2025 750th juliansiebert 🇩🇪 602 82 306ms 1 Mar 2025 751st Shanethegamer 🇺🇸 600 108 150ms 8 Jan 2025 751st pardouin 🇫🇷 600 108 150ms 29 Jul 2025 753rd Herbert00709 🇵🇱 599 110 5ms 5 Jan 2025 754th luuumine 🇫🇷 599 140 65ms 8 Dec 2025 755th Maximizer02 597 145 11ms 10 Jan 2025 756th dbut2 🇦🇺 597 183 283ms 14 Jan 2025 757th msbranicky 596 169 5ms 1 Jun 2025 758th ikskuh 595 139 10ms 27 Jun 2025 758th alexsave 595 139 10ms 7 Oct 2025 760th c0d3-4-F00d 🇩🇪 594 111 2ms 9 Jan 2025 760th wansacis 🇩🇪 594 111 2ms 30 Jan 2025 760th prestosilver 🇺🇸 594 111 2ms 18 Nov 2025 763rd Yewzir 🇧🇪 592 208 1,807ms 14 Nov 2025 764th Jay2k1 591 63 4ms 6 Nov 2025 765th two-bad 🇬🇧 590 140 11ms 22 Feb 2025 766th Yewzir 🇧🇪 590 142 476ms 6 Jan 2025 767th GolfingSuccess 🇬🇷 589 118 31ms 2 Jan 2025 767th edsrzf 🇳🇿 589 118 10ms 25 Aug 2025 769th ikskuh 589 209 1,658ms 27 Jun 2025 770th madex 🇩🇪 588 112 2ms 4 Jan 2025 770th Mandrzejy 🇵🇱 588 112 1ms 5 Jan 2025 772nd snoozingnewt 🇨🇦 588 143 738ms 2 Nov 2025 773rd emgordon154 587 120 7ms 12 Jan 2025 774th Shanethegamer 🇺🇸 587 177 138ms 3 Jan 2025 774th WatMan77 587 177 132ms 27 May 2025 776th martindotexe 🇳🇴 587 186 274ms 16 May 2025 777th dokutan 586 144 4ms 12 Feb 2025 778th CheeseCake628 🇳🇴 584 97 11ms 20 May 2025 779th matricronia 583 113 2ms 1 Feb 2026 780th Shanethegamer 🇺🇸 583 143 1,318ms 4 Jan 2025 781st emgordon154 580 87 1,233ms 5 Jan 2025 782nd mousetail 🇳🇱 579 59 24ms 6 Feb 2025 783rd Natanaelel 🇸🇪 579 62 32ms 11 Jul 2025 784th dokutan 579 120 2ms 5 Feb 2025 785th Ripick 579 146 395ms 15 Feb 2025 786th gastropner 578 114 2ms 5 Jul 2025 786th jupj 🇫🇮 578 114 2ms 27 Aug 2025 788th HaxSam 578 143 11ms 27 Jun 2025 789th emgordon154 577 93 2,537ms 2 Aug 2025 790th JunkIce 576 88 652ms 17 Jan 2025 791st aksyristos 570 145 11ms 11 Jan 2025 792nd ikskuh 570 147 70ms 26 Sep 2025 793rd HumanoidCPU 570 182 134ms 21 Nov 2025 794th blaztoma 🇱🇹 570 186 37ms 21 Sep 2025 795th denkyuu1 568 79 4,829ms 10 days ago 796th CaedenHarper 🇨🇦 568 116 4ms 21 Nov 2025 796th jgbaldwinbrown 568 116 5ms 2 Feb 2026 798th blaztoma 🇱🇹 563 117 4ms 21 Sep 2025 798th warmCabin 563 117 5ms 31 Dec 2025 800th frankgraziano 563 128 6ms 23 Aug 2025 First Prev 721–800 of 1,065 Next Last