The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Tutorial 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 560th MeWhenI 🇻🇦 0 51 2ms 11 Dec 2024 560th GolfingSuccess 🇬🇷 0 51 4ms 8 Feb 2025 560th h3ra993huskp 🇯🇵 0 51 2,059ms 15 Aug 2025 564th ovs-code 🇩🇪 0 52 2,861ms 31 May 2025 565th kg583 🇺🇸 0 53 590ms 21 Nov 2024 565th lifthrasiir 🇰🇷 0 53 561ms 2 Dec 2024 565th b-illy 🇬🇧 0 53 523ms 4 Jan 2025 565th CaedenHarper 🇨🇦 0 53 597ms 4 Jan 2025 565th GolfingSuccess 🇬🇷 0 53 531ms 14 Mar 2025 565th rucin93 🇵🇱 0 53 3ms 17 Apr 2025 565th zacjl 0 53 556ms 17 Apr 2025 565th Shanethegamer 🇺🇸 0 53 582ms 17 Apr 2025 565th pardouin 🇫🇷 0 53 514ms 17 Apr 2025 565th DialFrost 🇸🇬 0 53 523ms 17 Apr 2025 565th sean-niemann 🇺🇸 0 53 570ms 17 Apr 2025 565th HumanoidCPU 0 53 536ms 18 Apr 2025 565th m-tkach 🇺🇦 0 53 582ms 23 Apr 2025 565th emgordon154 0 53 530ms 23 Apr 2025 565th duckyluuk 🇳🇱 0 53 4ms 13 Jun 2025 565th duckyluuk 🇳🇱 0 53 587ms 13 Jun 2025 565th DialFrost 🇸🇬 0 53 6ms 13 Jun 2025 565th MeWhenI 🇻🇦 0 53 5ms 14 Jun 2025 565th rucin93 🇵🇱 0 53 5ms 14 Jun 2025 565th BREMAUCY 🇫🇷 0 53 5ms 1 Jul 2025 565th GolfingSuccess 🇬🇷 0 53 5ms 2 Jul 2025 565th fuzzylojik-golf 🇺🇸 0 53 2ms 15 Jul 2025 565th ovs-code 🇩🇪 0 53 623ms 18 Jul 2025 565th snoozingnewt 🇨🇦 0 53 4ms 15 Sep 2025 565th snoozingnewt 🇨🇦 0 53 524ms 15 Sep 2025 565th snoozingnewt 🇨🇦 0 53 5ms 15 Sep 2025 565th SirBogman 🇺🇸 0 53 525ms 5 Oct 2025 565th plcc0 0 53 533ms 7 Oct 2025 565th CornerMercury 🇬🇧 0 53 568ms 13 Oct 2025 565th frankgraziano 0 53 5ms 21 Nov 2025 565th HumanoidCPU 0 53 4ms 1 Jan 2026 565th HumanoidCPU 0 53 5ms 1 Jan 2026 565th Steffan153 🇫🇮 0 53 514ms 26 Feb 2026 598th neel11235813 0 54 563ms 9 Dec 2024 598th CLOStrophobic 🇮🇹 0 54 516ms 22 Jan 2025 598th edsrzf 🇳🇿 0 54 2ms 7 Aug 2025 601st Yewzir 🇧🇪 0 55 5ms 28 Dec 2024 601st JunkIce 0 55 545ms 7 Jan 2025 601st CLOStrophobic 🇮🇹 0 55 4ms 22 Jan 2025 601st commandz0 🇺🇸 0 55 497ms 2 Feb 2025 601st bizy-coder 0 55 521ms 18 Feb 2025 601st MeWhenI 🇻🇦 0 55 513ms 17 Apr 2025 601st Shanethegamer 🇺🇸 0 55 5ms 17 Apr 2025 601st CaedenHarper 🇨🇦 0 55 5ms 18 Apr 2025 609th AlephSquirrel 0 56 535ms 25 Nov 2024 609th sisyphus-ppcg 🇦🇺 0 56 6ms 26 Nov 2024 609th targrik 0 56 7ms 12 Jan 2025 609th GolfingSuccess 🇬🇷 0 56 10ms 5 Feb 2025 609th Bubbler-4 0 56 10ms 12 Feb 2025 609th sean-niemann 🇺🇸 0 56 3ms 24 Feb 2025 609th rucin93 🇵🇱 0 56 3ms 19 Apr 2025 609th DialFrost 🇸🇬 0 56 3ms 20 Apr 2025 609th HumanoidCPU 0 56 2ms 21 Apr 2025 609th FEZfan 🇦🇺 0 56 2ms 22 Apr 2025 609th dokutan 0 56 4ms 28 Apr 2025 609th Shanethegamer 🇺🇸 0 56 7ms 8 May 2025 609th GolfingSuccess 🇬🇷 0 56 7ms 8 May 2025 609th rucin93 🇵🇱 0 56 6ms 8 May 2025 609th emplv 🇱🇻 0 56 6ms 8 May 2025 609th sean-niemann 🇺🇸 0 56 7ms 9 May 2025 609th DialFrost 🇸🇬 0 56 6ms 9 May 2025 609th frankgraziano 0 56 2ms 19 May 2025 609th Shanethegamer 🇺🇸 0 56 3ms 6 Jun 2025 609th Shanethegamer 🇺🇸 0 56 2,011ms 4 Jul 2025 609th edsrzf 🇳🇿 0 56 7ms 19 Jul 2025 609th AbrahamJLR 🇻🇪 0 56 7ms 20 Jul 2025 609th albanian-laundromat 0 56 534ms 4 Aug 2025 609th snoozingnewt 🇨🇦 0 56 2ms 15 Sep 2025 609th snoozingnewt 🇨🇦 0 56 7ms 15 Sep 2025 609th CaedenHarper 🇨🇦 0 56 2ms 1 Oct 2025 609th GolfingSuccess 🇬🇷 0 56 2ms 12 Nov 2025 609th edsrzf 🇳🇿 0 56 3ms 12 Nov 2025 609th JOrE20 0 56 7ms 26 Nov 2025 609th HumanoidCPU 0 56 7ms 1 Jan 2026 639th edsrzf 🇳🇿 0 57 9ms 8 Feb 2025 639th emgordon154 0 57 4ms 14 Mar 2025 First Prev 561–640 of 3,374 Next Last