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?
Inventory Sequence 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 161st 2bular 899 27 33ms 3 Sep 2025 162nd primo-ppcg 🇹🇭 898 55 11ms 25 Nov 2022 162nd ovs-code 🇩🇪 898 55 9ms 25 Nov 2022 162nd Steffan153 🇫🇮 898 55 10ms 24 Jan 2023 162nd MeWhenI 🇻🇦 898 55 10ms 1 Jul 2023 162nd DialFrost 🇸🇬 898 55 10ms 30 Jul 2024 162nd sean-niemann 🇺🇸 898 55 10ms 30 Jul 2024 162nd rucin93 🇵🇱 898 55 11ms 30 Jul 2024 162nd duckyluuk 🇳🇱 898 55 11ms 18 Oct 2024 162nd xsot 🇸🇬 898 55 14ms 24 May 2025 162nd GrayJoKing 🇦🇺 898 55 10ms 11 Jul 2025 162nd pardouin 🇫🇷 898 55 9ms 26 Jul 2025 173rd Lydxn 🇨🇦 898 81 462ms 25 Jun 2023 174th ovs-code 🇩🇪 897 55 38ms 20 Nov 2022 174th xnor-gate 897 55 37ms 21 Nov 2022 174th primo-ppcg 🇹🇭 897 55 37ms 25 Nov 2022 174th neel11235813 897 55 35ms 24 Jan 2023 174th lynn 897 55 36ms 31 Jan 2023 174th btjones0 897 55 31ms 23 Feb 2023 174th HelloGravity 897 55 38ms 6 Apr 2023 174th ndren 897 55 35ms 12 Oct 2023 174th elgan65536 🇺🇸 897 55 11ms 31 Mar 2024 174th duckyluuk 🇳🇱 897 55 31ms 15 Aug 2024 174th zacjl 897 55 37ms 15 Sep 2024 174th jatloe 897 55 34ms 27 Sep 2024 174th lifthrasiir 🇰🇷 897 55 20ms 28 Nov 2024 174th ZakkkkAttackkkk 🇵🇭 897 55 11ms 5 Feb 2025 174th CaedenHarper 🇨🇦 897 55 31ms 1 Aug 2025 174th albanian-laundromat 897 55 33ms 9 Aug 2025 174th qpwoeirut 897 55 31ms 1 Oct 2025 174th Babafaba 897 55 31ms 7 Nov 2025 174th snoozingnewt 🇨🇦 897 55 33ms 13 Feb 2026 174th Flekay 🇩🇪 897 55 32ms 15 Feb 2026 174th JOrE20 897 55 32ms 27 days ago 195th IanUtley 896 77 18ms 12 Dec 2022 196th JayXon 🇺🇸 896 106 288ms 22 Nov 2022 196th nwellnhof 🇩🇪 896 106 289ms 22 Nov 2022 196th stefangimmillaro 896 106 290ms 17 Jun 2023 196th Lydxn 🇨🇦 896 106 288ms 24 Jun 2023 196th Steffan153 🇫🇮 896 106 298ms 14 Aug 2024 196th sean-niemann 🇺🇸 896 106 275ms 17 Apr 2025 196th edsrzf 🇳🇿 896 106 294ms 27 Aug 2025 203rd Steffan153 🇫🇮 895 84 399ms 14 Aug 2024 203rd sean-niemann 🇺🇸 895 84 417ms 20 Jun 2025 203rd namelessiw 895 84 440ms 14 Aug 2025 206th JayXon 🇺🇸 894 74 3,039ms 13 Nov 2024 207th sisyphus-ppcg 🇦🇺 892 45 1ms 22 Nov 2022 207th Steffan153 🇫🇮 892 45 1ms 14 Aug 2024 207th sean-niemann 🇺🇸 892 45 1ms 9 May 2025 210th SirBogman 🇺🇸 892 46 272ms 21 Nov 2022 210th primo-ppcg 🇹🇭 892 46 252ms 22 Nov 2022 210th Lydxn 🇨🇦 892 46 289ms 24 Jun 2023 210th bitsandbeyond 🇳🇱 892 46 250ms 31 Dec 2025 214th Lydxn 🇨🇦 892 74 41ms 27 Jun 2023 214th stefangimmillaro 892 74 38ms 31 Oct 2024 216th GolfingSuccess 🇬🇷 891 62 9ms 16 Oct 2023 217th m-tkach 🇺🇦 891 65 2ms 22 Nov 2022 217th Steffan153 🇫🇮 891 65 2ms 14 Aug 2024 217th BlankSpruce 891 65 2ms 16 Apr 2025 220th JayXon 🇺🇸 891 72 329ms 9 Apr 2023 221st stefangimmillaro 891 89 512ms 6 Oct 2025 221st DialFrost 🇸🇬 891 89 352ms 20 Nov 2025 223rd Lydxn 🇨🇦 890 42 8ms 25 Jan 2023 224th JayXon 🇺🇸 890 74 100ms 22 Jan 2025 225th m-tkach 🇺🇦 889 86 62ms 21 Nov 2022 225th sisyphus-ppcg 🇦🇺 889 86 59ms 22 Nov 2022 225th tailorspy 889 86 59ms 23 Sep 2024 228th Steffan153 🇫🇮 888 73 114ms 15 Aug 2024 229th acotis 888 97 133ms 31 Mar 2025 230th m-tkach 🇺🇦 888 106 27ms 18 Jan 2024 230th Steffan153 🇫🇮 888 106 28ms 27 Aug 2024 232nd FlyingPenguin223 887 70 2ms 1 Dec 2024 232nd GrayJoKing 🇦🇺 887 70 2ms 11 Jul 2025 232nd Steffan153 🇫🇮 887 70 32ms 11 days ago 235th Sakisan 🇧🇪 887 73 174ms 22 Nov 2022 235th ovs-code 🇩🇪 887 73 171ms 22 Nov 2022 235th xnor-gate 887 73 171ms 23 Nov 2022 235th lynn 887 73 168ms 27 Jan 2023 235th Steffan153 🇫🇮 887 73 171ms 20 Feb 2023 235th jared-hughes 887 73 165ms 13 Sep 2023 First Prev 161–240 of 1,663 Next Last