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?
Inventory Sequence 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 400th primo-ppcg 🇹🇭 857 77 42ms 24 Nov 2022 402nd emplv 🇱🇻 856 111 300ms 26 Jul 2023 403rd MeWhenI 🇻🇦 855 48 278ms 22 Jul 2024 403rd Steffan153 🇫🇮 855 48 293ms 9 Aug 2024 405th Shanethegamer 🇺🇸 855 61 33ms 19 Nov 2022 405th thehylian 855 61 33ms 11 Jan 2023 405th galloj 🇨🇿 855 61 36ms 4 Mar 2023 405th commandz0 🇺🇸 855 61 30ms 17 Nov 2023 405th mathisfun271 855 61 33ms 13 Feb 2024 405th BREMAUCY 🇫🇷 855 61 33ms 7 Mar 2024 405th stertooy 🇧🇪 855 61 31ms 10 Jun 2024 405th Alex-x90 🇺🇸 855 61 11ms 20 Nov 2024 405th KatieLG 🇬🇧 855 61 33ms 19 Oct 2025 405th solisolu 855 61 30ms 2 Dec 2025 405th Googolplexo 🇷🇺 855 61 34ms 3 hours ago 416th stefangimmillaro 855 77 79ms 5 Jun 2023 417th Shanethegamer 🇺🇸 855 85 461ms 22 Nov 2022 417th MeWhenI 🇻🇦 855 85 439ms 22 Jul 2024 417th DialFrost 🇸🇬 855 85 459ms 20 Nov 2025 420th janbehrens 🇩🇪 854 47 6ms 20 Nov 2022 421st GrayJoKing 🇦🇺 854 58 393ms 15 Jan 2024 421st SirBogman 🇺🇸 854 58 402ms 15 Jan 2024 421st AlephSquirrel 854 58 384ms 16 Jan 2024 421st DialFrost 🇸🇬 854 58 461ms 2 Aug 2024 421st emgordon154 854 58 478ms 17 May 2025 426th elgan65536 🇺🇸 853 101 124ms 10 Feb 2026 427th Natanaelel 🇸🇪 852 45 1,359ms 22 Jan 2025 428th itsh01 852 58 11ms 21 Nov 2022 428th prplz 🇦🇺 852 58 12ms 25 Nov 2022 428th Larento 852 58 10ms 13 Oct 2023 431st prplz 🇦🇺 852 69 2ms 22 Nov 2022 431st ZakkkkAttackkkk 🇵🇭 852 69 2ms 12 Aug 2023 433rd annaproxy 852 81 64ms 11 Dec 2022 434th 386asm 🇺🇸 851 73 40ms 8 May 2023 435th Steffan153 🇫🇮 850 38 3ms 27 Aug 2024 436th GrayJoKing 🇦🇺 850 65 3ms 9 Oct 2023 437th edsrzf 🇳🇿 850 84 8ms 2 days ago 438th jared-hughes 850 90 61ms 16 Mar 2023 439th ovs-code 🇩🇪 849 165 1,440ms 24 Jan 2025 440th JayXon 🇺🇸 848 65 142ms 22 Nov 2022 441st inventshah 848 78 2,539ms 12 Nov 2024 442nd ovs-code 🇩🇪 848 111 47ms 10 Feb 2023 442nd lynn 848 111 43ms 12 Jul 2023 444th MeWhenI 🇻🇦 848 112 304ms 22 Jul 2024 445th MeWhenI 🇻🇦 846 78 38ms 14 May 2023 446th revlayle 🇺🇸 845 89 396ms 26 Nov 2022 446th Shanethegamer 🇺🇸 845 89 374ms 20 Mar 2023 448th andersk 🇺🇸 845 102 121ms 20 Nov 2022 448th r-brinke 🇳🇱 845 102 151ms 14 Jun 2023 448th stefangimmillaro 845 102 123ms 4 Jun 2025 451st Shanethegamer 🇺🇸 843 94 466ms 25 Sep 2025 451st KasperKivimaeki 🇫🇮 843 94 438ms 1 Dec 2025 453rd UnderKoen 🇳🇱 843 148 42ms 20 Jan 2025 454th rak1507 🇬🇧 842 62 31ms 22 Nov 2022 454th fourth-bit 842 62 35ms 7 Dec 2022 454th SniperSmiley 🇺🇸 842 62 33ms 10 Dec 2022 454th Fracture17 842 62 32ms 14 Apr 2023 454th quimey 842 62 35ms 23 Jun 2023 454th dranjohn 842 62 50ms 11 Sep 2023 454th RedzGoose 🇦🇺 842 62 12ms 17 Jun 2024 454th smilesformiles3 842 62 11ms 21 Jun 2025 454th 77Tigers 842 62 32ms 13 Jan 2026 463rd SirBogman 🇺🇸 841 43 45ms 22 Nov 2022 463rd stefangimmillaro 841 43 35ms 29 Apr 2023 463rd nwellnhof 🇩🇪 841 43 38ms 24 Jun 2023 466th neel11235813 840 59 411ms 15 Jan 2024 466th inventshah 840 59 444ms 22 Jan 2024 466th duckyluuk 🇳🇱 840 59 439ms 26 May 2024 466th CaedenHarper 🇨🇦 840 59 480ms 30 Dec 2024 466th Babafaba 840 59 463ms 7 Nov 2025 466th snoozingnewt 🇨🇦 840 59 407ms 13 Feb 2026 472nd jared-hughes 840 70 2ms 16 Mar 2023 473rd DialFrost 🇸🇬 839 74 42ms 30 Dec 2025 474th Shanethegamer 🇺🇸 839 100 1,329ms 17 Feb 2023 475th emgordon154 839 166 1,654ms 7 Jan 2026 476th GolfingSuccess 🇬🇷 839 167 1,458ms 6 Dec 2025 477th thisishowmymindworks 🇳🇴 837 59 11ms 2 Jul 2024 477th Yax42 🇫🇷 837 59 10ms 16 Aug 2025 479th lynn 836 103 125ms 6 Nov 2025 480th Shanethegamer 🇺🇸 835 88 317ms 24 Nov 2022 First Prev 401–480 of 1,680 Next Last