The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Arabic to Roman 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 79th chunes3 🇺🇸 966 53 198ms 18 Sep 2023 79th ovs-code 🇩🇪 966 53 218ms 18 Sep 2023 79th Kacarott 🇦🇺 966 53 197ms 18 Sep 2023 79th primo-ppcg 🇹🇭 966 53 209ms 18 Sep 2023 79th Steffan153 🇫🇮 966 53 191ms 19 Sep 2023 79th Lydxn 🇨🇦 966 53 203ms 28 Sep 2023 79th Yewzir 🇧🇪 966 53 199ms 19 Nov 2023 79th error256 966 53 186ms 14 May 2024 79th pardouin 🇫🇷 966 53 213ms 27 Aug 2024 79th edsrzf 🇳🇿 966 53 219ms 25 Sep 2024 79th DialFrost 🇸🇬 966 53 206ms 26 Sep 2024 79th Shanethegamer 🇺🇸 966 53 196ms 24 Nov 2024 79th GolfingSuccess 🇬🇷 966 53 211ms 14 Feb 2025 79th sean-niemann 🇺🇸 966 53 217ms 7 Apr 2025 79th fuzzylojik-golf 🇺🇸 966 53 226ms 17 Sep 2025 79th snoozingnewt 🇨🇦 966 53 222ms 7 Oct 2025 79th JayXon 🇺🇸 966 53 197ms 2 Nov 2025 98th primo-ppcg 🇹🇭 965 63 38ms 16 Aug 2019 99th kartik-s 964 50 18ms 15 Apr 2018 99th StavromulaBeta 964 50 16ms 12 Apr 2019 99th ai-fischer 964 50 17ms 1 Oct 2021 99th Yewzir 🇧🇪 964 50 20ms 18 Feb 2024 99th wh3n3v3r 🇨🇿 964 50 17ms 8 Nov 2024 99th yokasuretsu 964 50 21ms 14 Jan 2025 99th plcc0 964 50 19ms 26 Mar 2025 99th JOrE20 964 50 19ms 29 Dec 2025 107th primo-ppcg 🇹🇭 961 56 357ms 29 Aug 2019 108th sisyphus-ppcg 🇦🇺 959 48 8ms 22 May 2022 109th lynn 957 57 45ms 22 Aug 2024 109th MeWhenI 🇻🇦 957 57 43ms 22 Aug 2024 109th Steffan153 🇫🇮 957 57 45ms 22 Aug 2024 109th dokutan 957 57 45ms 25 Aug 2024 109th kg583 🇺🇸 957 57 42ms 27 Aug 2024 109th Shanethegamer 🇺🇸 957 57 43ms 27 Aug 2024 109th pardouin 🇫🇷 957 57 44ms 4 Sep 2024 109th AlephSquirrel 957 57 44ms 8 Sep 2024 109th edsrzf 🇳🇿 957 57 47ms 17 Sep 2024 109th DialFrost 🇸🇬 957 57 46ms 6 Dec 2024 109th emgordon154 957 57 48ms 13 Dec 2024 109th CLOStrophobic 🇮🇹 957 57 44ms 21 Jan 2025 109th GolfingSuccess 🇬🇷 957 57 43ms 14 Feb 2025 109th ian-h-chamberlain 🇺🇸 957 57 47ms 18 Oct 2025 109th snoozingnewt 🇨🇦 957 57 45ms 18 Oct 2025 124th xsot 🇸🇬 956 90 20ms 22 Nov 2019 124th btnlq 956 90 20ms 25 Dec 2022 126th primo-ppcg 🇹🇭 956 91 36ms 28 Nov 2020 127th gifti258 948 54 189ms 18 Sep 2023 127th MeWhenI 🇻🇦 948 54 200ms 6 Nov 2023 127th BREMAUCY 🇫🇷 948 54 234ms 7 May 2024 130th hallvabo 🇳🇴 946 91 20ms 16 Sep 2022 130th Steffan153 🇫🇮 946 91 39ms 11 Jul 2024 130th pardouin 🇫🇷 946 91 40ms 12 Jul 2024 133rd Attero 🇸🇪 945 51 22ms 14 Oct 2020 133rd janbehrens 🇩🇪 945 51 19ms 29 Mar 2021 133rd orthoplex 🇨🇽 945 51 21ms 25 Jul 2021 133rd NewDefectus 🇮🇱 945 51 20ms 1 Oct 2021 133rd scpchicken 🇵🇼 945 51 21ms 7 Mar 2022 133rd inventshah 945 51 21ms 8 May 2022 133rd jacobly0 🇺🇸 945 51 21ms 2 Sep 2023 133rd lifthrasiir 🇰🇷 945 51 20ms 30 Nov 2024 141st ovs-code 🇩🇪 945 108 11ms 13 Feb 2024 141st rhdqor213 945 108 10ms 11 Dec 2024 143rd nwellnhof 🇩🇪 944 57 704ms 19 Feb 2020 144th bitsandbeyond 🇳🇱 942 79 625ms 23 Feb 2026 145th jkelly467 941 58 42ms 9 Jan 2026 146th Lydxn 🇨🇦 941 83 457ms 16 Jan 2024 147th Steffan153 🇫🇮 938 73 46ms 12 Dec 2023 147th MeWhenI 🇻🇦 938 73 39ms 13 Dec 2023 147th Shanethegamer 🇺🇸 938 73 48ms 19 Dec 2023 147th m-tkach 🇺🇦 938 73 47ms 2 Feb 2024 147th dokutan 938 73 37ms 7 May 2024 147th edsrzf 🇳🇿 938 73 39ms 5 Oct 2024 147th emgordon154 938 73 48ms 11 Dec 2024 147th GolfingSuccess 🇬🇷 938 73 35ms 14 Feb 2025 147th sean-niemann 🇺🇸 938 73 47ms 25 Apr 2025 147th error256 938 73 34ms 9 May 2025 147th vgamula 🇺🇦 938 73 37ms 14 Jul 2025 147th kg583 🇺🇸 938 73 34ms 29 Jul 2025 147th ZoDoneRightNow 938 73 47ms 13 Oct 2025 147th snoozingnewt 🇨🇦 938 73 47ms 22 Nov 2025 First Prev 81–160 of 1,907 Next Last