The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 398th 09cf 800 122 2ms 30 Nov 2025 402nd Shanethegamer 🇺🇸 799 77 36ms 21 Mar 2023 403rd inventshah 799 103 1,469ms 28 Sep 2023 403rd emgordon154 799 103 1,452ms 18 Nov 2024 405th MeWhenI 🇻🇦 799 148 59ms 8 May 2022 406th stefangimmillaro 798 162 123ms 3 Jun 2022 406th Shanethegamer 🇺🇸 798 162 111ms 3 Jun 2022 408th jmerle 🇳🇱 797 85 10ms 7 Jul 2024 408th Artemis21 🇬🇧 797 85 10ms 10 Jan 2025 408th fkantelberg 797 85 11ms 15 Jul 2025 411th emgordon154 797 108 4ms 6 Jun 2025 412th MeWhenI 🇻🇦 797 158 2ms 10 Sep 2022 413th Shanethegamer 🇺🇸 797 195 1,458ms 2 Apr 2025 414th sisyphus-ppcg 🇦🇺 797 204 1ms 15 Jul 2022 415th GrayJoKing 🇦🇺 796 130 7ms 27 Nov 2025 416th snoozingnewt 🇨🇦 796 137 40ms 7 Dec 2025 417th m-tkach 🇺🇦 796 151 446ms 1 Apr 2022 418th stefangimmillaro 796 160 502ms 6 Oct 2025 419th JOrE20 796 189 27ms 3 Feb 2026 420th albanian-laundromat 795 101 1,416ms 20 Oct 2025 421st stefangimmillaro 795 122 2,826ms 15 Nov 2024 422nd kellengreen 795 123 9ms 20 Sep 2024 422nd snoozingnewt 🇨🇦 795 123 10ms 5 Oct 2025 424th jared-hughes 793 123 1ms 29 Mar 2022 424th jupj 🇫🇮 793 123 1ms 30 Dec 2023 426th Kacarott 🇦🇺 793 124 60ms 9 Dec 2025 427th AlephSquirrel 792 135 6ms 3 Oct 2024 428th blaztoma 🇱🇹 792 143 107ms 5 Jan 2026 429th Shanethegamer 🇺🇸 792 159 2ms 21 Mar 2023 430th albanian-laundromat 792 179 286ms 8 Dec 2025 431st dpethes 792 190 55ms 12 Dec 2025 432nd albanian-laundromat 791 82 447ms 12 Sep 2025 433rd Shanethegamer 🇺🇸 791 123 1ms 21 Mar 2023 434th GrayJoKing 🇦🇺 791 137 122ms 25 days ago 435th dpethes 791 152 409ms 8 Jan 2024 435th Yewzir 🇧🇪 791 152 395ms 19 Jun 2024 437th emgordon154 791 168 145ms 19 Apr 2025 438th MeWhenI 🇻🇦 790 109 4ms 16 Aug 2024 439th tatzyr 🇯🇵 789 78 36ms 9 Feb 2025 440th BREMAUCY 🇫🇷 789 319 10ms 7 Aug 2025 441st GrayJoKing 🇦🇺 788 124 11ms 29 Mar 2022 441st dokutan 788 124 11ms 21 Aug 2024 441st JOrE20 788 124 10ms 7 Jan 2026 444th blaztoma 🇱🇹 788 141 2ms 25 days ago 445th inventshah 787 124 1ms 17 Nov 2022 445th weliveinhell 🇭🇹 787 124 1ms 1 Feb 2024 447th dokutan 786 126 3ms 31 Jul 2024 447th emgordon154 786 126 4ms 23 Dec 2024 449th primo-ppcg 🇹🇭 786 136 6ms 22 Jan 2023 450th albanian-laundromat 784 124 1ms 2 Oct 2025 451st BlankSpruce 783 151 63ms 22 Aug 2024 452nd blaztoma 🇱🇹 783 165 227ms 5 Jan 2026 453rd StarmaQ 782 142 1ms 27 Mar 2022 453rd aDwarfNamedUrist 782 142 2ms 9 Dec 2022 455th janbehrens 🇩🇪 782 322 10ms 2 Aug 2023 456th Shanethegamer 🇺🇸 781 83 409ms 16 Jan 2024 456th KatieLG 🇬🇧 781 83 390ms 28 Oct 2024 458th rucin93 🇵🇱 780 117 1ms 14 Nov 2025 459th billings7 🇬🇧 780 154 412ms 17 May 2022 459th arctouch-cristiannevianna 780 154 406ms 9 Feb 2024 461st neel11235813 779 79 35ms 1 Mar 2023 461st ovs-code 🇩🇪 779 79 34ms 27 May 2024 463rd CaedenHarper 🇨🇦 779 182 297ms 4 Nov 2025 464th MeWhenI 🇻🇦 778 87 10ms 27 Mar 2022 464th xnor-gate 778 87 10ms 28 Oct 2022 464th lynn 778 87 11ms 3 Apr 2023 464th tayacrystals 778 87 10ms 18 Nov 2023 468th tailorspy 778 152 424ms 24 May 2024 468th zygoloid 778 152 64ms 4 Aug 2024 470th RockOfStone 777 143 2ms 23 Mar 2024 471st oeb25 777 171 129ms 16 May 2022 472nd KatieLG 🇬🇧 777 324 10ms 26 Sep 2024 473rd voytxt 🇨🇿 776 126 13ms 1 Mar 2023 474th emgordon154 776 147 6ms 19 days ago 475th CLOStrophobic 🇮🇹 775 132 41ms 8 Mar 2025 476th postie77 775 155 422ms 16 Mar 2023 477th m-tkach 🇺🇦 774 126 2ms 29 Mar 2022 477th Alex-x90 🇺🇸 774 126 1ms 15 May 2023 479th janAkali 🇷🇺 774 140 391ms 20 days ago 480th emgordon154 774 153 480ms 8 Feb 2026 First Prev 401–480 of 2,312 Next Last