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?
𝑒 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 321st DialFrost 🇸🇬 923 66 2,227ms 28 Aug 2024 322nd DialFrost 🇸🇬 922 65 10ms 17 Mar 2025 323rd ovs-code 🇩🇪 922 96 391ms 27 Aug 2024 324th ovs-code 🇩🇪 921 110 66ms 27 Aug 2024 324th DialFrost 🇸🇬 921 110 63ms 4 Sep 2024 324th inventshah 921 110 73ms 1 Apr 2025 327th ovs-code 🇩🇪 921 114 145ms 20 Apr 2025 328th DialFrost 🇸🇬 920 137 298ms 5 Sep 2024 328th JayXon 🇺🇸 920 137 290ms 5 Apr 2025 330th primo-ppcg 🇹🇭 919 41 72ms 18 Sep 2023 331st JayXon 🇺🇸 918 84 484ms 12 Mar 2022 331st Lydxn 🇨🇦 918 84 479ms 26 Jul 2022 331st sean-niemann 🇺🇸 918 84 529ms 7 Jun 2024 331st Steffan153 🇫🇮 918 84 472ms 21 Jul 2024 331st ovs-code 🇩🇪 918 84 493ms 21 Jul 2024 336th primo-ppcg 🇹🇭 917 89 5ms 24 Aug 2020 337th canissimia 🇦🇶 917 265 179ms 8 Mar 2024 338th MeWhenI 🇻🇦 916 41 80ms 8 Oct 2022 338th janlelis 916 41 76ms 4 Dec 2023 338th ovs-code 🇩🇪 916 41 44ms 29 Aug 2024 341st GrayJoKing 🇦🇺 916 49 84ms 29 May 2022 341st Steffan153 🇫🇮 916 49 87ms 21 Jun 2024 343rd stefangimmillaro 916 60 1,413ms 26 Dec 2024 344th JayXon 🇺🇸 915 105 148ms 22 Apr 2025 345th JayXon 🇺🇸 914 91 248ms 6 Apr 2025 346th MeWhenI 🇻🇦 913 54 7ms 23 Nov 2025 347th KasperKivimaeki 🇫🇮 913 111 64ms 18 Nov 2024 348th JayXon 🇺🇸 913 115 165ms 5 Apr 2025 349th pardouin 🇫🇷 912 67 2,684ms 4 Dec 2024 349th JayXon 🇺🇸 912 67 2,866ms 2 Jan 2025 351st primo-ppcg 🇹🇭 912 118 154ms 6 Aug 2024 352nd JayXon 🇺🇸 911 89 115ms 16 Oct 2022 352nd emplv 🇱🇻 911 89 121ms 8 Dec 2022 352nd Lydxn 🇨🇦 911 89 120ms 2 Mar 2023 355th HPWiz 🇳🇿 911 93 2,680ms 7 Mar 2025 356th andersk 🇺🇸 910 28 39ms 4 Mar 2023 356th BREMAUCY 🇫🇷 910 28 39ms 25 Oct 2024 356th snoozingnewt 🇨🇦 910 28 38ms 14 Sep 2025 359th nwellnhof 🇩🇪 909 31 148ms 4 Dec 2022 359th Lydxn 🇨🇦 909 31 139ms 3 Feb 2023 361st primo-ppcg 🇹🇭 909 58 116ms 30 Dec 2018 361st xnor-gate 909 58 119ms 4 Jun 2021 361st ovs-code 🇩🇪 909 58 123ms 19 Jan 2023 364th sean-niemann 🇺🇸 909 67 2,251ms 19 Dec 2024 365th btnlq 909 92 42ms 24 Sep 2022 366th DialFrost 🇸🇬 909 109 51ms 23 Oct 2024 367th NewDefectus 🇮🇱 908 25 40ms 18 Dec 2021 367th jared-hughes 908 25 41ms 22 Jan 2023 369th GrayJoKing 🇦🇺 908 66 356ms 1 Nov 2023 370th btnlq 907 42 279ms 1 Jan 2021 370th Lydxn 🇨🇦 907 42 274ms 4 Jan 2022 370th DialFrost 🇸🇬 907 42 270ms 7 Jun 2024 370th Steffan153 🇫🇮 907 42 298ms 10 Aug 2024 370th bitsandbeyond 🇳🇱 907 42 282ms 20 Oct 2025 375th DialFrost 🇸🇬 907 52 136ms 4 Aug 2024 375th sean-niemann 🇺🇸 907 52 134ms 6 Aug 2024 375th GrayJoKing 🇦🇺 907 52 151ms 13 Aug 2024 375th pardouin 🇫🇷 907 52 125ms 28 Sep 2024 379th tayloia 🇬🇧 907 53 13ms 7 Apr 2025 380th edsrzf 🇳🇿 907 61 40ms 30 Dec 2024 380th DialFrost 🇸🇬 907 61 38ms 13 Feb 2025 380th kg583 🇺🇸 907 61 40ms 14 Feb 2025 380th zacjl 907 61 41ms 16 May 2025 384th DialFrost 🇸🇬 907 85 508ms 7 Jun 2024 385th sean-niemann 🇺🇸 907 87 76ms 19 Nov 2025 385th Steffan153 🇫🇮 907 87 171ms 11 Feb 2026 387th nwellnhof 🇩🇪 907 90 6ms 25 Jan 2022 388th FlyingPenguin223 907 96 16ms 22 Jan 2026 389th primo-ppcg 🇹🇭 907 179 1,033ms 4 Oct 2020 390th nwellnhof 🇩🇪 906 139 282ms 1 May 2020 390th primo-ppcg 🇹🇭 906 139 304ms 21 Sep 2020 390th Lydxn 🇨🇦 906 139 287ms 14 Jul 2021 393rd primo-ppcg 🇹🇭 905 116 131ms 5 Apr 2025 394th DialFrost 🇸🇬 904 92 196ms 4 Sep 2024 395th primo-ppcg 🇹🇭 904 97 79ms 6 Aug 2023 396th primo-ppcg 🇹🇭 904 112 65ms 18 Jan 2022 396th nwellnhof 🇩🇪 904 112 65ms 25 Jan 2022 398th m-tkach 🇺🇦 904 147 423ms 30 Oct 2024 399th billings7 🇬🇧 903 98 445ms 21 Nov 2021 399th tomtheisen 🇺🇸 903 98 400ms 21 Nov 2021 First Prev 321–400 of 3,434 Next Last