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 400th antimon2 🇯🇵 795 97 416ms 11 Aug 2025 402nd sisyphus-ppcg 🇦🇺 794 94 55ms 24 Jun 2022 403rd SirBogman 🇺🇸 793 80 50ms 28 Aug 2022 404th stefangimmillaro 793 114 1,459ms 23 Feb 2023 405th niklv 🇷🇺 791 110 19ms 21 Dec 2023 406th anter69 🇭🇺 790 109 49ms 9 Mar 2022 406th dirckvdende 790 109 25ms 6 Jul 2025 408th SirBogman 🇺🇸 789 77 75ms 22 Jan 2024 409th Ripick 787 87 54ms 17 Mar 2024 410th galloj 🇨🇿 785 95 63ms 22 Jan 2023 411th primo-ppcg 🇹🇭 785 130 10ms 22 Feb 2020 411th KasperKivimaeki 🇫🇮 785 130 8ms 19 Aug 2025 413th Sam-Vrgl 784 111 13ms 13 May 2025 414th Bubbler-4 783 81 39ms 26 Apr 2022 414th rak1507 🇬🇧 783 81 42ms 2 May 2022 416th jacklynnepenick 783 110 19ms 14 Aug 2021 416th Yewzir 🇧🇪 783 110 25ms 3 Jun 2024 416th HumanoidCPU 783 110 27ms 31 Oct 2024 416th keelimeguy 🇺🇸 783 110 61ms 17 May 2025 420th primo-ppcg 🇹🇭 783 152 437ms 21 Nov 2021 421st FlorianCassayre 🇫🇷 782 51 182ms 26 May 2024 422nd MeWhenI 🇻🇦 782 186 6ms 24 Jul 2023 423rd Shanethegamer 🇺🇸 782 193 139ms 28 Jan 2024 424th stefangimmillaro 782 195 51ms 26 Apr 2025 425th scpchicken 🇵🇼 781 100 66ms 17 Apr 2022 426th Kacarott 🇦🇺 779 70 47ms 22 Aug 2024 427th prplz 🇦🇺 779 131 9ms 19 Apr 2021 428th primo-ppcg 🇹🇭 779 137 18ms 18 May 2023 429th JayXon 🇺🇸 779 146 494ms 5 Mar 2022 430th laikoni 779 187 355ms 10 Jan 2019 431st xsot 🇸🇬 778 149 11ms 10 Oct 2023 432nd FortuiteMan 🇫🇷 777 62 15ms 7 Oct 2024 433rd KatieLG 🇬🇧 777 112 18ms 5 Oct 2025 434th xsot 🇸🇬 777 127 21ms 19 Apr 2025 435th MeWhenI 🇻🇦 776 339 1,738ms 10 Feb 2025 436th MeWhenI 🇻🇦 775 111 26ms 22 Oct 2021 437th Jeremy-Stafford 775 188 361ms 29 Mar 2023 438th tomtheisen 🇺🇸 773 154 433ms 1 Feb 2023 439th stefangimmillaro 773 213 183ms 4 Jun 2025 440th UnderKoen 🇳🇱 772 223 193ms 8 Jul 2024 441st RussellEmerine 771 189 328ms 2 Jan 2020 442nd emgordon154 770 113 20ms 1 Aug 2024 443rd prplz 🇦🇺 770 175 2,862ms 9 Jan 2022 444th edsrzf 🇳🇿 768 151 7ms 24 Feb 2026 445th dokutan 767 52 105ms 6 Apr 2025 446th Shanethegamer 🇺🇸 766 189 440ms 24 Sep 2025 447th snoozingnewt 🇨🇦 765 180 121ms 13 Dec 2025 448th RyanMHsiao 765 287 1,777ms 25 Sep 2024 449th inventshah 764 149 3,207ms 26 Oct 2024 450th ETHproductions 🇺🇸 763 114 16ms 23 May 2018 450th vlpx 🇫🇮 763 114 24ms 23 Sep 2024 452nd DialFrost 🇸🇬 763 149 514ms 15 Apr 2025 453rd AdrienHache 🇫🇷 763 156 474ms 24 Dec 2023 454th Babafaba 762 113 22ms 24 Nov 2025 454th dokutan 762 113 27ms 1 Feb 2026 456th MeWhenI 🇻🇦 762 326 104ms 19 Jul 2025 457th DialFrost 🇸🇬 761 153 24ms 16 Apr 2025 457th edsrzf 🇳🇿 761 153 23ms 1 Sep 2025 459th GrayJoKing 🇦🇺 761 163 419ms 24 Jul 2025 460th DialFrost 🇸🇬 760 110 994ms 1 Sep 2025 461st MeWhenI 🇻🇦 760 160 145ms 1 Feb 2024 462nd sean-niemann 🇺🇸 759 130 23ms 30 May 2025 463rd lifthrasiir 🇰🇷 758 72 49ms 30 Nov 2024 464th solmyr2000 757 178 515ms 19 Jun 2022 465th southpolenator 756 135 10ms 12 Jun 2023 466th jmerle 🇳🇱 755 114 22ms 20 Jun 2023 466th SB-945 755 114 25ms 3 Mar 2024 468th marcin7Cd 755 193 361ms 24 Jan 2021 469th DialFrost 🇸🇬 755 200 285ms 16 Apr 2025 470th SirBogman 🇺🇸 755 202 47ms 16 Apr 2022 471st edsrzf 🇳🇿 755 218 224ms 22 Jul 2025 472nd GolfingSuccess 🇬🇷 754 88 79ms 14 Feb 2025 473rd sisyphus-ppcg 🇦🇺 753 54 134ms 28 Jul 2022 473rd ovs-code 🇩🇪 753 54 111ms 10 Feb 2025 475th Alex-x90 🇺🇸 753 179 466ms 25 Oct 2023 476th SirBogman 🇺🇸 752 99 1,202ms 18 May 2024 477th duckyluuk 🇳🇱 751 104 1,241ms 7 Jul 2025 478th KrausRaus 🇺🇸 750 116 31ms 2 Sep 2020 479th QuincyNash 🇺🇸 749 115 414ms 4 Dec 2022 480th prplz 🇦🇺 749 159 440ms 21 Nov 2021 First Prev 401–480 of 1,906 Next Last