The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 399th edsrzf 🇳🇿 862 72 2ms 27 Aug 2025 402nd GrayJoKing 🇦🇺 861 42 42ms 21 Nov 2022 402nd JayXon 🇺🇸 861 42 48ms 22 Nov 2022 402nd pardouin 🇫🇷 861 42 50ms 2 Sep 2025 405th primo-ppcg 🇹🇭 861 54 71ms 24 Sep 2023 406th GrayJoKing 🇦🇺 861 67 249ms 22 Aug 2023 407th kg583 🇺🇸 861 103 4,967ms 15 hours ago 408th Steffan153 🇫🇮 860 83 10ms 7 days ago 409th m-tkach 🇺🇦 860 101 25ms 20 Nov 2022 410th GrayJoKing 🇦🇺 859 89 57ms 1 Dec 2022 410th Alex-x90 🇺🇸 859 89 53ms 20 Nov 2024 412th SirBogman 🇺🇸 857 77 39ms 22 Nov 2022 412th primo-ppcg 🇹🇭 857 77 42ms 24 Nov 2022 414th emplv 🇱🇻 856 111 300ms 26 Jul 2023 415th MeWhenI 🇻🇦 855 48 278ms 22 Jul 2024 415th Steffan153 🇫🇮 855 48 293ms 9 Aug 2024 417th Shanethegamer 🇺🇸 855 61 33ms 19 Nov 2022 417th thehylian 855 61 33ms 11 Jan 2023 417th galloj 🇨🇿 855 61 36ms 4 Mar 2023 417th commandz0 🇺🇸 855 61 30ms 17 Nov 2023 417th mathisfun271 855 61 33ms 13 Feb 2024 417th BREMAUCY 🇫🇷 855 61 33ms 7 Mar 2024 417th stertooy 🇧🇪 855 61 31ms 10 Jun 2024 417th Alex-x90 🇺🇸 855 61 11ms 20 Nov 2024 417th KatieLG 🇬🇧 855 61 33ms 19 Oct 2025 417th solisolu 855 61 30ms 2 Dec 2025 417th Googolplexo 🇷🇺 855 61 34ms 30 hours ago 428th stefangimmillaro 855 77 100ms 5 Jun 2023 429th Shanethegamer 🇺🇸 855 85 461ms 22 Nov 2022 429th MeWhenI 🇻🇦 855 85 439ms 22 Jul 2024 429th DialFrost 🇸🇬 855 85 459ms 20 Nov 2025 432nd janbehrens 🇩🇪 854 47 6ms 20 Nov 2022 433rd GrayJoKing 🇦🇺 854 58 393ms 15 Jan 2024 433rd SirBogman 🇺🇸 854 58 402ms 15 Jan 2024 433rd AlephSquirrel 854 58 384ms 16 Jan 2024 433rd DialFrost 🇸🇬 854 58 461ms 2 Aug 2024 433rd emgordon154 854 58 478ms 17 May 2025 438th elgan65536 🇺🇸 853 101 122ms 10 Feb 2026 439th Natanaelel 🇸🇪 852 45 1,359ms 22 Jan 2025 440th itsh01 852 58 11ms 21 Nov 2022 440th prplz 🇦🇺 852 58 12ms 25 Nov 2022 440th Larento 852 58 10ms 13 Oct 2023 443rd prplz 🇦🇺 852 69 2ms 22 Nov 2022 443rd ZakkkkAttackkkk 🇵🇭 852 69 2ms 12 Aug 2023 445th annaproxy 852 81 64ms 11 Dec 2022 446th 386asm 🇺🇸 851 73 40ms 8 May 2023 447th Steffan153 🇫🇮 850 38 3ms 27 Aug 2024 448th GrayJoKing 🇦🇺 850 65 3ms 9 Oct 2023 449th inventshah 850 78 2,539ms 12 Nov 2024 450th edsrzf 🇳🇿 850 84 8ms 3 days ago 451st jared-hughes 850 90 61ms 16 Mar 2023 452nd ovs-code 🇩🇪 849 165 1,501ms 24 Jan 2025 453rd JayXon 🇺🇸 848 65 142ms 22 Nov 2022 454th ovs-code 🇩🇪 848 111 47ms 10 Feb 2023 454th lynn 848 111 43ms 12 Jul 2023 456th MeWhenI 🇻🇦 848 112 304ms 22 Jul 2024 457th MeWhenI 🇻🇦 846 78 38ms 14 May 2023 458th revlayle 🇺🇸 845 89 396ms 26 Nov 2022 458th Shanethegamer 🇺🇸 845 89 374ms 20 Mar 2023 460th andersk 🇺🇸 845 102 122ms 20 Nov 2022 460th r-brinke 🇳🇱 845 102 126ms 14 Jun 2023 460th stefangimmillaro 845 102 119ms 4 Jun 2025 463rd Shanethegamer 🇺🇸 843 94 466ms 25 Sep 2025 463rd KasperKivimaeki 🇫🇮 843 94 438ms 1 Dec 2025 465th UnderKoen 🇳🇱 843 148 42ms 20 Jan 2025 466th rak1507 🇬🇧 842 62 31ms 22 Nov 2022 466th fourth-bit 842 62 35ms 7 Dec 2022 466th SniperSmiley 🇺🇸 842 62 33ms 10 Dec 2022 466th Fracture17 842 62 32ms 14 Apr 2023 466th quimey 842 62 35ms 23 Jun 2023 466th dranjohn 842 62 50ms 11 Sep 2023 466th RedzGoose 🇦🇺 842 62 12ms 17 Jun 2024 466th smilesformiles3 842 62 11ms 21 Jun 2025 466th 77Tigers 842 62 32ms 13 Jan 2026 475th SirBogman 🇺🇸 841 43 45ms 22 Nov 2022 475th stefangimmillaro 841 43 35ms 29 Apr 2023 475th nwellnhof 🇩🇪 841 43 38ms 24 Jun 2023 478th neel11235813 840 59 411ms 15 Jan 2024 478th inventshah 840 59 444ms 22 Jan 2024 478th duckyluuk 🇳🇱 840 59 439ms 26 May 2024 First Prev 401–480 of 1,685 Next Last