The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
ASCII Table 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 639th KayzaFlo 712 137 2ms 3 Oct 2024 639th tmyt 712 137 2ms 19 Jan 2026 643rd GrayJoKing 🇦🇺 712 157 119ms 22 Apr 2022 643rd tobeannouncd 712 157 118ms 10 Jan 2024 645th destofr 712 199 359ms 23 Aug 2022 646th saito-ta 🇯🇵 711 62 40ms 18 Jul 2024 647th rifatx 711 169 409ms 22 Jul 2024 648th Shanethegamer 🇺🇸 710 124 5ms 8 May 2025 649th MCausc78 🇺🇦 710 187 126ms 30 Dec 2022 650th Matter1024 🇮🇳 708 138 9ms 5 Feb 2026 651st gw280 708 167 59ms 16 Dec 2024 651st prestosilver 🇺🇸 708 167 63ms 24 days ago 653rd olleicua 🇺🇸 707 87 35ms 20 Jan 2024 654th elgan65536 🇺🇸 707 138 2ms 2 Mar 2024 654th dokutan 707 138 2ms 30 Mar 2025 654th Maltaran 🇵🇱 707 138 2ms 26 days ago 657th the-zammers 707 158 116ms 2 Oct 2023 658th madex 🇩🇪 707 188 154ms 26 Jun 2024 659th Lydxn 🇨🇦 706 77 137ms 6 Dec 2022 660th HumanoidCPU 705 92 375ms 25 Dec 2025 661st bricknellj 705 96 9ms 26 May 2022 661st nwellnhof 🇩🇪 705 96 9ms 6 Dec 2022 661st 5cw 🇺🇸 705 96 10ms 13 May 2024 661st Babafaba 705 96 10ms 30 Oct 2025 665th JPRuskin 🇬🇧 705 97 277ms 1 May 2024 665th HeyItsGilbert 705 97 282ms 1 May 2024 667th DialFrost 🇸🇬 705 124 3ms 12 Oct 2023 668th JDiLenarda 🇫🇷 705 150 1,236ms 18 Jun 2025 669th AnAwesomGuy 704 114 1,107ms 22 Sep 2025 670th qwertyuiop3 🇷🇺 704 168 58ms 30 May 2025 671st adyache 🇺🇸 703 171 480ms 5 May 2023 671st Adix-null 🇱🇹 703 171 402ms 1 Nov 2025 673rd djeedjay 🇳🇱 702 139 1ms 18 Sep 2022 673rd Lv0Sys 🇵🇱 702 139 2ms 6 Dec 2025 673rd bac0id 702 139 2ms 30 Jan 2026 676th snoozingnewt 🇨🇦 701 169 496ms 1 Nov 2025 677th snoozingnewt 🇨🇦 700 180 2ms 2 Nov 2025 678th CaedenHarper 🇨🇦 700 182 545ms 7 Oct 2025 679th clockworknazo 699 63 41ms 29 Oct 2022 680th pilaf 🇦🇷 699 88 35ms 8 Apr 2022 680th lynn 699 88 33ms 28 Feb 2023 680th Natanaelel 🇸🇪 699 88 37ms 22 Jun 2023 683rd KatieLG 🇬🇧 698 140 12ms 5 Oct 2025 684th retrohun 697 140 1ms 16 Dec 2022 684th emgordon154 697 140 1ms 25 Jul 2024 686th janbehrens 🇩🇪 696 120 4ms 16 Nov 2022 687th stefangimmillaro 696 122 38ms 9 Jul 2025 688th kkoenig 696 170 441ms 20 Dec 2023 688th dcgjb 696 170 406ms 30 Apr 2025 688th snoozingnewt 🇨🇦 696 170 423ms 1 Nov 2025 688th emgordon154 696 170 62ms 7 Feb 2026 692nd jerrandolph 695 204 318ms 20 Oct 2023 693rd DialFrost 🇸🇬 693 127 5ms 9 Jun 2025 694th Irratix 🇳🇱 692 141 2ms 14 May 2022 694th Heathcorp 🇦🇺 692 141 1ms 28 Oct 2022 694th pandapawskat 692 141 1ms 6 Dec 2022 694th dcgjb 692 141 1ms 10 Jan 2024 694th jbjd 692 141 1ms 27 Feb 2024 699th emgordon154 692 238 1,716ms 18 Dec 2025 700th primo-ppcg 🇹🇭 691 89 36ms 31 Mar 2022 701st JunkIce 690 94 432ms 13 Feb 2025 702nd Shanethegamer 🇺🇸 690 129 6ms 23 Apr 2024 703rd BlobTheKat 689 142 10ms 18 Jul 2022 703rd janbehrens 🇩🇪 689 142 10ms 16 Nov 2022 703rd Lv0Sys 🇵🇱 689 142 11ms 27 Feb 2026 706th yishayv 688 172 60ms 22 Jan 2023 707th harshit54 688 206 281ms 3 Oct 2023 708th daifkyou 687 142 1ms 14 Dec 2022 708th qwertyuiop3 🇷🇺 687 142 2ms 30 May 2025 710th MeWhenI 🇻🇦 687 149 44ms 4 Sep 2024 711th alemelis 686 104 778ms 3 Apr 2023 712th Yewzir 🇧🇪 686 117 1,014ms 16 Nov 2025 713th frnco 686 120 1,437ms 6 Jun 2022 713th snoozingnewt 🇨🇦 686 120 1,491ms 1 Nov 2025 715th prestosilver 🇺🇸 686 158 297ms 26 days ago 716th frosster 🇨🇦 686 162 1ms 15 Mar 2025 717th jeff-at-tamer-dot-codes 🇺🇸 684 99 10ms 21 May 2023 717th Rubiksmath 684 99 9ms 8 Sep 2023 717th CheeseCake628 🇳🇴 684 99 12ms 20 Dec 2023 717th StefanHabel 🇨🇦 684 99 10ms 1 Mar 2026 First Prev 641–720 of 2,313 Next Last