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?
Emirp Numbers 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 401st snoozingnewt 🇨🇦 888 97 105ms 30 Nov 2025 401st edsrzf 🇳🇿 888 97 113ms 30 Nov 2025 401st emgordon154 888 97 112ms 1 Dec 2025 401st DialFrost 🇸🇬 888 97 108ms 1 Dec 2025 401st GolfingSuccess 🇬🇷 888 97 119ms 6 Dec 2025 401st Steffan153 🇫🇮 888 97 118ms 25 days ago 407th davitf 887 74 11ms 19 Nov 2018 407th marcin7Cd 887 74 10ms 4 Oct 2020 407th SirBogman 🇺🇸 887 74 10ms 5 Oct 2020 407th prplz 🇦🇺 887 74 9ms 26 Oct 2020 407th MeWhenI 🇻🇦 887 74 9ms 15 Oct 2021 407th stefangimmillaro 887 74 9ms 1 Dec 2021 407th annaproxy 887 74 10ms 28 Dec 2021 407th jared-hughes 887 74 9ms 30 Mar 2022 407th QuincyNash 🇺🇸 887 74 11ms 29 Nov 2022 407th scpchicken 🇵🇼 887 74 10ms 17 Jan 2023 407th aksyristos 887 74 11ms 26 Jan 2023 407th bricknellj 887 74 10ms 7 Feb 2023 407th htareque 887 74 9ms 6 Oct 2023 407th Yewzir 🇧🇪 887 74 11ms 23 Oct 2023 407th duckyluuk 🇳🇱 887 74 10ms 18 Feb 2024 407th emgordon154 887 74 10ms 20 Jul 2024 407th b-illy 🇬🇧 887 74 10ms 16 Aug 2024 407th lifthrasiir 🇰🇷 887 74 9ms 21 Nov 2024 407th plcc0 887 74 10ms 9 Mar 2025 407th CaedenHarper 🇨🇦 887 74 10ms 4 Dec 2025 427th Shanethegamer 🇺🇸 887 176 10ms 1 Aug 2023 427th Lydxn 🇨🇦 887 176 9ms 1 Aug 2023 427th MeWhenI 🇻🇦 887 176 9ms 1 Aug 2023 427th JayXon 🇺🇸 887 176 9ms 2 Aug 2023 427th Steffan153 🇫🇮 887 176 10ms 2 Aug 2023 427th janbehrens 🇩🇪 887 176 9ms 2 Aug 2023 427th GrayJoKing 🇦🇺 887 176 10ms 11 Aug 2023 427th BREMAUCY 🇫🇷 887 176 10ms 7 Sep 2023 427th lynn 887 176 9ms 17 Oct 2023 427th dokutan 887 176 9ms 26 Oct 2023 427th Yewzir 🇧🇪 887 176 10ms 12 Mar 2024 427th HumanoidCPU 887 176 10ms 6 May 2024 427th pardouin 🇫🇷 887 176 10ms 20 Aug 2024 427th KatieLG 🇬🇧 887 176 10ms 26 Sep 2024 427th emgordon154 887 176 10ms 4 Dec 2024 427th CaedenHarper 🇨🇦 887 176 9ms 24 Jan 2025 427th rucin93 🇵🇱 887 176 9ms 23 Apr 2025 427th albanian-laundromat 887 176 10ms 20 Jul 2025 427th GolfingSuccess 🇬🇷 887 176 9ms 8 Nov 2025 427th snoozingnewt 🇨🇦 887 176 10ms 5 Dec 2025 447th duckyluuk 🇳🇱 886 75 4ms 16 Dec 2024 447th Yewzir 🇧🇪 886 75 5ms 23 Dec 2024 449th orthoplex 🇨🇽 885 64 33ms 31 Mar 2022 449th SirBogman 🇺🇸 885 64 37ms 9 Jan 2024 451st DialFrost 🇸🇬 885 85 142ms 6 Aug 2024 452nd MeWhenI 🇻🇦 884 92 38ms 16 May 2023 453rd Lydxn 🇨🇦 882 62 2ms 13 May 2023 454th neel11235813 882 71 452ms 15 Jan 2024 454th GrayJoKing 🇦🇺 882 71 393ms 15 Jan 2024 454th sean-niemann 🇺🇸 882 71 377ms 6 Jun 2025 457th primo-ppcg 🇹🇭 882 84 37ms 21 Jun 2022 458th edsrzf 🇳🇿 882 104 39ms 31 Dec 2024 458th kg583 🇺🇸 882 104 40ms 2 Apr 2025 460th ovs-code 🇩🇪 882 109 58ms 3 Jun 2024 460th sean-niemann 🇺🇸 882 109 54ms 29 Jul 2024 462nd marcin7Cd 882 177 10ms 12 Oct 2020 462nd Attero 🇸🇪 882 177 9ms 12 Oct 2020 462nd sisyphus-ppcg 🇦🇺 882 177 10ms 30 May 2021 462nd SirBogman 🇺🇸 882 177 9ms 28 Nov 2021 462nd scpchicken 🇵🇼 882 177 10ms 22 Dec 2021 462nd SpareManiKatti 882 177 9ms 19 Apr 2022 462nd ovs-code 🇩🇪 882 177 9ms 22 Apr 2022 469th Attero 🇸🇪 880 44 104ms 24 Apr 2020 469th SirBogman 🇺🇸 880 44 108ms 29 Oct 2022 469th SirFireball3521 880 44 111ms 3 Mar 2023 472nd snoozingnewt 🇨🇦 880 88 111ms 29 Nov 2025 473rd GrayJoKing 🇦🇺 880 95 7ms 24 Feb 2026 473rd edsrzf 🇳🇿 880 95 6ms 14 days ago 475th Steffan153 🇫🇮 879 75 7ms 12 Dec 2023 475th Lydxn 🇨🇦 879 75 6ms 20 Dec 2023 475th edsrzf 🇳🇿 879 75 6ms 12 Feb 2025 475th sean-niemann 🇺🇸 879 75 7ms 19 Apr 2025 475th DialFrost 🇸🇬 879 75 6ms 1 Jan 2026 480th sean-niemann 🇺🇸 879 98 108ms 7 Dec 2025 First Prev 401–480 of 3,203 Next Last
