The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 30 hours. Why not try and solve them ahead of time?
φ 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 640th bwenstar 778 65 10ms 9 Aug 2022 640th nstearns96 🇬🇧 778 65 10ms 15 Sep 2023 640th keelimeguy 🇺🇸 778 65 13ms 6 Nov 2023 640th GeorgeStechman 🇬🇧 778 65 47ms 6 Jan 2024 645th jared-hughes 777 73 123ms 15 Sep 2023 646th KasperKivimaeki 🇫🇮 776 135 68ms 20 Nov 2025 647th acotis 776 184 158ms 28 Jun 2025 648th ovs-code 🇩🇪 775 91 193ms 9 Jul 2024 648th DialFrost 🇸🇬 775 91 139ms 23 Mar 2025 650th MeWhenI 🇻🇦 774 57 346ms 14 Jul 2024 651st MeWhenI 🇻🇦 773 68 1,341ms 12 May 2023 652nd sean-niemann 🇺🇸 773 93 4,144ms 25 Jun 2025 653rd duckyluuk 🇳🇱 773 105 474ms 25 Sep 2025 654th itsh01 771 62 54ms 14 Sep 2022 654th owen-c-parker 🇺🇸 771 62 10ms 30 Mar 2023 654th gigaprofisi 🇺🇸 771 62 10ms 1 Sep 2025 657th DialFrost 🇸🇬 771 136 77ms 9 Dec 2025 658th DialFrost 🇸🇬 770 107 722ms 1 Apr 2025 659th GolfingSuccess 🇬🇷 768 60 449ms 25 Jan 2025 660th MeWhenI 🇻🇦 766 39 46ms 13 Jul 2024 661st petar-donchev 766 66 81ms 3 Sep 2019 661st za3k 766 66 12ms 19 Oct 2022 661st robin-scragg 766 66 25ms 28 Sep 2025 664th dokutan 764 49 7ms 25 Feb 2026 665th BREMAUCY 🇫🇷 763 44 235ms 23 Mar 2024 665th janlelis 763 44 48ms 23 Sep 2024 665th DialFrost 🇸🇬 763 44 233ms 26 Dec 2024 668th edsrzf 🇳🇿 763 140 77ms 23 Dec 2025 669th stefangimmillaro 763 187 153ms 6 Nov 2023 670th stassats 762 65 22ms 28 Apr 2018 670th jslip 762 65 35ms 5 Sep 2018 670th GrayJoKing 🇦🇺 762 65 13ms 17 Dec 2020 670th BBoehm 🇩🇪 762 65 13ms 25 Feb 2021 674th AlephSquirrel 760 25 131ms 24 Jul 2022 674th MeWhenI 🇻🇦 760 25 40ms 25 Jul 2022 674th GrayJoKing 🇦🇺 760 25 40ms 31 Jul 2022 674th lynn 760 25 90ms 11 Oct 2023 674th emgordon154 760 25 89ms 10 Sep 2025 679th stefangimmillaro 759 65 2,490ms 14 Nov 2024 680th SirBogman 🇺🇸 759 133 47ms 3 Jun 2025 681st FlorianCassayre 🇫🇷 759 139 296ms 19 Jul 2025 682nd albanian-laundromat 758 141 77ms 23 Dec 2025 683rd commandz0 🇺🇸 755 61 364ms 15 Jan 2024 684th JunkIce 755 67 13ms 24 Nov 2024 685th Herbert00709 🇵🇱 754 133 13ms 7 Jun 2024 686th sean-niemann 🇺🇸 754 159 44ms 25 May 2023 687th pardouin 🇫🇷 750 66 14ms 21 Mar 2025 688th SirBogman 🇺🇸 748 59 347ms 9 Jun 2020 689th primo-ppcg 🇹🇭 747 36 38ms 6 Dec 2020 689th Sp3000 🇦🇺 747 36 10ms 28 May 2021 691st DayDun 🇸🇪 747 64 11ms 24 Jan 2023 691st jbt 747 64 10ms 24 Dec 2023 693rd snoozingnewt 🇨🇦 746 45 85ms 16 Oct 2025 693rd anter69 🇭🇺 746 45 81ms 9 Dec 2025 695th MeWhenI 🇻🇦 746 50 95ms 1 Nov 2023 696th emgordon154 745 97 491ms 27 May 2025 697th CatsAreFluffy 744 68 11ms 19 Feb 2023 697th jtaxen 744 68 13ms 31 Mar 2024 697th RaBa21 🇭🇺 744 68 27ms 18 Jul 2025 697th cros107 🇦🇺 744 68 10ms 5 Sep 2025 701st lynn 743 61 17ms 15 Nov 2021 702nd Shanethegamer 🇺🇸 743 62 404ms 16 Jan 2024 702nd namelessiw 743 62 454ms 5 Mar 2024 702nd Herbert00709 🇵🇱 743 62 436ms 13 May 2024 702nd KatieLG 🇬🇧 743 62 370ms 28 Oct 2024 706th j-Ewan 743 142 350ms 14 Mar 2022 706th jerrandolph 743 142 283ms 23 Dec 2023 708th MeWhenI 🇻🇦 741 62 172ms 3 Aug 2024 709th DialFrost 🇸🇬 741 97 2,597ms 4 Sep 2024 710th primo-ppcg 🇹🇭 740 71 1,229ms 25 Nov 2021 711th SirFireball3521 739 33 444ms 14 Mar 2023 712th MeWhenI 🇻🇦 739 195 4ms 12 Aug 2024 713th ovs-code 🇩🇪 736 67 2,840ms 30 Nov 2024 714th stefangimmillaro 735 96 136ms 18 Oct 2023 715th dokutan 735 196 3ms 12 Aug 2024 716th wh3n3v3r 🇨🇿 733 69 13ms 8 Nov 2024 717th sean-niemann 🇺🇸 731 26 41ms 22 Jul 2022 717th DaCuteRaccoon 731 26 40ms 13 Dec 2022 717th DialFrost 🇸🇬 731 26 40ms 7 Jan 2023 717th SirBogman 🇺🇸 731 26 43ms 28 May 2023 First Prev 641–720 of 2,495 Next Last