The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. Why not try and solve them ahead of time?
φ 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 641st petar-donchev 783 66 81ms 3 Sep 2019 641st za3k 783 66 12ms 19 Oct 2022 641st qpwoeirut 783 66 13ms 14 Aug 2025 644th lifthrasiir 🇰🇷 783 316 1,392ms 15 Dec 2024 645th jared-hughes 782 73 123ms 15 Sep 2023 646th MeWhenI 🇻🇦 781 57 346ms 14 Jul 2024 647th ovs-code 🇩🇪 781 91 193ms 9 Jul 2024 647th DialFrost 🇸🇬 781 91 139ms 23 Mar 2025 649th MeWhenI 🇻🇦 780 68 1,341ms 12 May 2023 650th KasperKivimaeki 🇫🇮 780 135 68ms 20 Nov 2025 651st acotis 778 184 158ms 28 Jun 2025 652nd dokutan 777 49 7ms 25 Feb 2026 653rd Herbert00709 🇵🇱 777 133 13ms 7 Jun 2024 654th MeWhenI 🇻🇦 776 39 48ms 13 Jul 2024 655th itsh01 775 62 54ms 14 Sep 2022 655th owen-c-parker 🇺🇸 775 62 10ms 30 Mar 2023 655th gigaprofisi 🇺🇸 775 62 10ms 1 Sep 2025 658th DialFrost 🇸🇬 775 107 722ms 1 Apr 2025 659th DialFrost 🇸🇬 774 136 77ms 9 Dec 2025 660th BREMAUCY 🇫🇷 771 44 235ms 23 Mar 2024 660th janlelis 771 44 48ms 23 Sep 2024 660th DialFrost 🇸🇬 771 44 233ms 26 Dec 2024 663rd stassats 768 65 22ms 28 Apr 2018 663rd jslip 768 65 35ms 5 Sep 2018 663rd GrayJoKing 🇦🇺 768 65 13ms 17 Dec 2020 663rd BBoehm 🇩🇪 768 65 13ms 25 Feb 2021 667th FlorianCassayre 🇫🇷 768 139 296ms 19 Jul 2025 668th stefangimmillaro 767 65 2,490ms 14 Nov 2024 669th Sp3000 🇦🇺 766 38 10ms 28 May 2021 670th edsrzf 🇳🇿 766 140 77ms 23 Dec 2025 671st lynn 765 61 17ms 15 Nov 2021 672nd stefangimmillaro 765 187 153ms 6 Nov 2023 673rd SirBogman 🇺🇸 763 133 47ms 3 Jun 2025 674th albanian-laundromat 761 141 77ms 23 Dec 2025 675th CatsAreFluffy 760 68 11ms 19 Feb 2023 675th cros107 🇦🇺 760 68 10ms 5 Sep 2025 677th emgordon154 759 97 491ms 27 May 2025 678th rucin93 🇵🇱 757 116 116ms 28 Mar 2025 679th sean-niemann 🇺🇸 757 159 44ms 25 May 2023 680th MeWhenI 🇻🇦 756 50 95ms 1 Nov 2023 681st pardouin 🇫🇷 756 66 14ms 21 Mar 2025 682nd SirBogman 🇺🇸 755 59 347ms 9 Jun 2020 683rd snoozingnewt 🇨🇦 754 45 85ms 16 Oct 2025 683rd anter69 🇭🇺 754 45 81ms 9 Dec 2025 685th j-Ewan 752 142 350ms 14 Mar 2022 685th jerrandolph 752 142 283ms 23 Dec 2023 687th DayDun 🇸🇪 751 64 11ms 24 Jan 2023 687th jbt 751 64 10ms 24 Dec 2023 689th MeWhenI 🇻🇦 750 62 172ms 3 Aug 2024 690th Shanethegamer 🇺🇸 749 69 10ms 27 Jun 2022 690th elgan65536 🇺🇸 749 69 72ms 18 Nov 2023 692nd primo-ppcg 🇹🇭 747 71 1,229ms 25 Nov 2021 693rd ovs-code 🇩🇪 744 67 2,840ms 30 Nov 2024 694th edsrzf 🇳🇿 742 51 61ms 15 Dec 2025 695th primo-ppcg 🇹🇭 741 63 113ms 30 Jan 2022 696th stefangimmillaro 740 96 136ms 18 Oct 2023 697th zbreit 🇺🇸 739 70 12ms 17 Aug 2021 697th thehylian 739 70 12ms 30 Dec 2022 697th NDR0216 🇹🇼 739 70 12ms 17 Feb 2023 697th fourth-bit 739 70 13ms 9 Jul 2023 697th cefqrn 739 70 12ms 13 Apr 2025 697th dirckvdende 739 70 13ms 27 Jul 2025 697th InigoK 🇺🇸 739 70 13ms 29 Aug 2025 697th dokutan 739 70 13ms 14 Feb 2026 705th Natanaelel 🇸🇪 738 46 38ms 28 Dec 2022 705th Yewzir 🇧🇪 738 46 88ms 19 Feb 2024 705th Lv0Sys 🇵🇱 738 46 78ms 8 Jun 2025 708th anter69 🇭🇺 737 72 1,224ms 9 Dec 2025 709th CaedenHarper 🇨🇦 737 112 462ms 24 Sep 2025 709th dokutan 737 112 437ms 7 Nov 2025 711th CatsAreFluffy 736 68 478ms 15 Jan 2024 712th stefangimmillaro 735 138 52ms 26 Apr 2025 713th jared-hughes 731 144 67ms 9 Mar 2024 714th zakariamouhid 728 66 11ms 18 May 2023 714th FlorianCassayre 🇫🇷 728 66 66ms 4 Jun 2024 714th helbling 🇨🇭 728 66 9ms 9 Sep 2024 717th sstadick 728 71 25ms 20 Feb 2018 717th biotinker 728 71 25ms 20 Feb 2018 717th gregadoff 728 71 24ms 20 Feb 2018 717th tcoard 728 71 24ms 20 Feb 2018 First Prev 641–720 of 2,518 Next Last