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 pardouin 🇫🇷 861 42 50ms 2 Sep 2025 402nd primo-ppcg 🇹🇭 861 54 71ms 24 Sep 2023 403rd GrayJoKing 🇦🇺 861 67 249ms 22 Aug 2023 404th edsrzf 🇳🇿 861 103 4,972ms 114 mins ago 404th kg583 🇺🇸 861 103 4,994ms 76 mins ago 406th Steffan153 🇫🇮 860 83 10ms 6 days ago 407th m-tkach 🇺🇦 860 101 25ms 20 Nov 2022 408th GrayJoKing 🇦🇺 859 89 57ms 1 Dec 2022 408th Alex-x90 🇺🇸 859 89 53ms 20 Nov 2024 410th SirBogman 🇺🇸 857 77 39ms 22 Nov 2022 410th primo-ppcg 🇹🇭 857 77 42ms 24 Nov 2022 412th emplv 🇱🇻 856 111 300ms 26 Jul 2023 413th MeWhenI 🇻🇦 855 48 278ms 22 Jul 2024 413th Steffan153 🇫🇮 855 48 293ms 9 Aug 2024 415th Shanethegamer 🇺🇸 855 61 33ms 19 Nov 2022 415th thehylian 855 61 33ms 11 Jan 2023 415th galloj 🇨🇿 855 61 36ms 4 Mar 2023 415th commandz0 🇺🇸 855 61 30ms 17 Nov 2023 415th mathisfun271 855 61 33ms 13 Feb 2024 415th BREMAUCY 🇫🇷 855 61 33ms 7 Mar 2024 415th stertooy 🇧🇪 855 61 31ms 10 Jun 2024 415th Alex-x90 🇺🇸 855 61 11ms 20 Nov 2024 415th KatieLG 🇬🇧 855 61 33ms 19 Oct 2025 415th solisolu 855 61 30ms 2 Dec 2025 415th Googolplexo 🇷🇺 855 61 34ms 15 hours ago 426th stefangimmillaro 855 77 100ms 5 Jun 2023 427th Shanethegamer 🇺🇸 855 85 461ms 22 Nov 2022 427th MeWhenI 🇻🇦 855 85 439ms 22 Jul 2024 427th DialFrost 🇸🇬 855 85 459ms 20 Nov 2025 430th janbehrens 🇩🇪 854 47 6ms 20 Nov 2022 431st GrayJoKing 🇦🇺 854 58 393ms 15 Jan 2024 431st SirBogman 🇺🇸 854 58 402ms 15 Jan 2024 431st AlephSquirrel 854 58 384ms 16 Jan 2024 431st DialFrost 🇸🇬 854 58 461ms 2 Aug 2024 431st emgordon154 854 58 478ms 17 May 2025 436th elgan65536 🇺🇸 853 101 122ms 10 Feb 2026 437th Natanaelel 🇸🇪 852 45 1,359ms 22 Jan 2025 438th itsh01 852 58 11ms 21 Nov 2022 438th prplz 🇦🇺 852 58 12ms 25 Nov 2022 438th Larento 852 58 10ms 13 Oct 2023 441st prplz 🇦🇺 852 69 2ms 22 Nov 2022 441st ZakkkkAttackkkk 🇵🇭 852 69 2ms 12 Aug 2023 443rd annaproxy 852 81 64ms 11 Dec 2022 444th 386asm 🇺🇸 851 73 40ms 8 May 2023 445th Steffan153 🇫🇮 850 38 3ms 27 Aug 2024 446th GrayJoKing 🇦🇺 850 65 3ms 9 Oct 2023 447th inventshah 850 78 2,539ms 12 Nov 2024 448th edsrzf 🇳🇿 850 84 8ms 3 days ago 449th jared-hughes 850 90 61ms 16 Mar 2023 450th ovs-code 🇩🇪 849 165 1,501ms 24 Jan 2025 451st JayXon 🇺🇸 848 65 142ms 22 Nov 2022 452nd ovs-code 🇩🇪 848 111 47ms 10 Feb 2023 452nd lynn 848 111 43ms 12 Jul 2023 454th MeWhenI 🇻🇦 848 112 304ms 22 Jul 2024 455th MeWhenI 🇻🇦 846 78 38ms 14 May 2023 456th revlayle 🇺🇸 845 89 396ms 26 Nov 2022 456th Shanethegamer 🇺🇸 845 89 374ms 20 Mar 2023 458th andersk 🇺🇸 845 102 122ms 20 Nov 2022 458th r-brinke 🇳🇱 845 102 126ms 14 Jun 2023 458th stefangimmillaro 845 102 119ms 4 Jun 2025 461st Shanethegamer 🇺🇸 843 94 466ms 25 Sep 2025 461st KasperKivimaeki 🇫🇮 843 94 438ms 1 Dec 2025 463rd UnderKoen 🇳🇱 843 148 42ms 20 Jan 2025 464th rak1507 🇬🇧 842 62 31ms 22 Nov 2022 464th fourth-bit 842 62 35ms 7 Dec 2022 464th SniperSmiley 🇺🇸 842 62 33ms 10 Dec 2022 464th Fracture17 842 62 32ms 14 Apr 2023 464th quimey 842 62 35ms 23 Jun 2023 464th dranjohn 842 62 50ms 11 Sep 2023 464th RedzGoose 🇦🇺 842 62 12ms 17 Jun 2024 464th smilesformiles3 842 62 11ms 21 Jun 2025 464th 77Tigers 842 62 32ms 13 Jan 2026 473rd SirBogman 🇺🇸 841 43 45ms 22 Nov 2022 473rd stefangimmillaro 841 43 35ms 29 Apr 2023 473rd nwellnhof 🇩🇪 841 43 38ms 24 Jun 2023 476th neel11235813 840 59 411ms 15 Jan 2024 476th inventshah 840 59 444ms 22 Jan 2024 476th duckyluuk 🇳🇱 840 59 439ms 26 May 2024 476th CaedenHarper 🇨🇦 840 59 480ms 30 Dec 2024 476th Babafaba 840 59 463ms 7 Nov 2025 First Prev 401–480 of 1,684 Next Last