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?
Niven Numbers (Long) 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 706th JunkIce 887 55 17ms 24 Nov 2024 706th 5quiwyrm 887 55 17ms 10 Dec 2024 706th souta-1326 887 55 17ms 25 Mar 2025 706th wobblybits 887 55 17ms 23 Aug 2025 706th 77Tigers 887 55 16ms 13 Jan 2026 726th fuzzylojik-golf 🇺🇸 886 53 6ms 10 Sep 2025 726th targrik 886 53 6ms 27 Nov 2025 726th KasperKivimaeki 🇫🇮 886 53 24ms 10 Dec 2025 729th ovs-code 🇩🇪 886 56 303ms 19 Nov 2025 730th DialFrost 🇸🇬 886 79 402ms 26 Sep 2025 730th sean-niemann 🇺🇸 886 79 457ms 26 Sep 2025 730th pardouin 🇫🇷 886 79 479ms 26 Sep 2025 730th fuzzylojik-golf 🇺🇸 886 79 543ms 26 Sep 2025 730th Yewzir 🇧🇪 886 79 368ms 2 Oct 2025 730th m-tkach 🇺🇦 886 79 528ms 3 Oct 2025 730th Yax42 🇫🇷 886 79 485ms 5 Oct 2025 730th namelessiw 886 79 501ms 6 Oct 2025 730th b-illy 🇬🇧 886 79 526ms 8 Dec 2025 730th Steffan153 🇫🇮 886 79 371ms 11 Feb 2026 740th m-tkach 🇺🇦 886 93 16ms 2 Jun 2023 740th Lydxn 🇨🇦 886 93 18ms 19 Jul 2023 742nd primo-ppcg 🇹🇭 885 68 17ms 4 Sep 2022 743rd ovs-code 🇩🇪 885 72 475ms 8 Aug 2022 743rd Yax42 🇫🇷 885 72 465ms 5 Oct 2025 745th GrayJoKing 🇦🇺 885 99 24ms 14 Aug 2022 745th primo-ppcg 🇹🇭 885 99 25ms 4 Sep 2022 745th m-tkach 🇺🇦 885 99 25ms 2 Jun 2023 748th Steffan153 🇫🇮 884 45 16ms 11 Aug 2024 748th sisyphus-ppcg 🇦🇺 884 45 24ms 12 Aug 2024 748th Shanethegamer 🇺🇸 884 45 16ms 14 Aug 2024 748th DialFrost 🇸🇬 884 45 16ms 17 Aug 2024 752nd Yewzir 🇧🇪 884 66 1,317ms 14 days ago 753rd DialFrost 🇸🇬 883 88 108ms 14 Apr 2025 753rd edsrzf 🇳🇿 883 88 114ms 30 Nov 2025 753rd snoozingnewt 🇨🇦 883 88 117ms 1 Dec 2025 753rd pardouin 🇫🇷 883 88 131ms 4 Dec 2025 753rd Steffan153 🇫🇮 883 88 115ms 27 Feb 2026 758th SirBogman 🇺🇸 882 41 4,208ms 6 Jan 2024 758th juliansiebert 🇩🇪 882 41 4,157ms 2 Mar 2025 760th MeWhenI 🇻🇦 881 70 98ms 22 Mar 2024 761st Steffan153 🇫🇮 881 101 296ms 17 Dec 2022 761st MeWhenI 🇻🇦 881 101 294ms 21 Feb 2023 761st stefangimmillaro 881 101 293ms 14 Jun 2023 761st sean-niemann 🇺🇸 881 101 283ms 17 Jun 2023 761st Yewzir 🇧🇪 881 101 303ms 10 Apr 2024 761st pardouin 🇫🇷 881 101 293ms 20 Oct 2024 761st fuzzylojik-golf 🇺🇸 881 101 281ms 15 Jul 2025 761st b-illy 🇬🇧 881 101 293ms 17 Dec 2025 769th janbehrens 🇩🇪 880 44 348ms 8 Aug 2022 769th MeWhenI 🇻🇦 880 44 369ms 25 Nov 2022 771st pardouin 🇫🇷 880 86 64ms 21 Oct 2024 772nd AlephSquirrel 878 88 96ms 31 Jan 2025 773rd canissimia 🇦🇶 878 218 7ms 21 Aug 2022 774th primo-ppcg 🇹🇭 876 94 17ms 4 Sep 2022 774th Steffan153 🇫🇮 876 94 15ms 28 Jul 2024 774th pardouin 🇫🇷 876 94 15ms 21 Oct 2024 777th pardouin 🇫🇷 876 100 25ms 21 Oct 2024 778th DialFrost 🇸🇬 876 124 1,477ms 11 Apr 2025 778th Steffan153 🇫🇮 876 124 1,448ms 25 days ago 780th JayXon 🇺🇸 876 133 1,655ms 15 Sep 2025 781st dokutan 875 36 1,309ms 30 Apr 2024 782nd sisyphus-ppcg 🇦🇺 875 69 117ms 14 Oct 2022 782nd Steffan153 🇫🇮 875 69 119ms 17 Nov 2022 782nd sean-niemann 🇺🇸 875 69 117ms 11 Apr 2023 782nd m-tkach 🇺🇦 875 69 123ms 2 Jun 2023 782nd stefangimmillaro 875 69 111ms 14 Jun 2023 782nd Yewzir 🇧🇪 875 69 120ms 10 Apr 2024 782nd pardouin 🇫🇷 875 69 114ms 21 Oct 2024 782nd DialFrost 🇸🇬 875 69 128ms 11 Apr 2025 782nd fuzzylojik-golf 🇺🇸 875 69 104ms 28 Aug 2025 791st nwellnhof 🇩🇪 875 80 501ms 25 Sep 2025 791st stefangimmillaro 875 80 628ms 6 Oct 2025 791st sisyphus-ppcg 🇦🇺 875 80 375ms 25 Nov 2025 791st CaedenHarper 🇨🇦 875 80 495ms 8 Dec 2025 791st snoozingnewt 🇨🇦 875 80 471ms 10 Dec 2025 791st edsrzf 🇳🇿 875 80 364ms 5 Feb 2026 791st error256 875 80 370ms 16 days ago 798th DialFrost 🇸🇬 874 63 3ms 11 Apr 2025 798th MeWhenI 🇻🇦 874 63 3ms 25 Dec 2025 800th pardouin 🇫🇷 874 67 2ms 21 Oct 2024 First Prev 721–800 of 2,543 Next Last