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 557th BlankSpruce 745 131 2ms 17 Aug 2024 562nd rucin93 🇵🇱 745 171 374ms 24 Sep 2025 562nd h3ra993huskp 🇯🇵 745 171 519ms 30 Nov 2025 564th yzhs 🇩🇪 744 91 10ms 31 May 2022 565th Shanethegamer 🇺🇸 744 159 439ms 21 Mar 2023 566th MaxCastella 🇫🇷 743 92 276ms 4 Aug 2022 566th Feniske 🇫🇷 743 92 280ms 4 Aug 2022 568th Shanethegamer 🇺🇸 743 191 290ms 7 Feb 2024 569th emgordon154 743 203 27ms 16 hours ago 570th DialFrost 🇸🇬 742 144 5ms 18 Feb 2025 571st MeWhenI 🇻🇦 741 150 1ms 20 Feb 2023 571st Shanethegamer 🇺🇸 741 150 2ms 21 Mar 2023 573rd AshyIsMe 🇦🇺 740 71 33ms 21 Jul 2022 574th annaproxy 740 151 115ms 30 Mar 2022 575th DialFrost 🇸🇬 739 132 1ms 14 Dec 2023 576th chunes3 🇺🇸 739 133 63ms 17 Sep 2023 577th KayzaFlo 739 160 64ms 3 Oct 2024 578th albanian-laundromat 739 204 27ms 12 days ago 579th Shanethegamer 🇺🇸 738 180 133ms 10 Mar 2023 580th Yewzir 🇧🇪 738 223 1,693ms 17 May 2024 581st dokutan 737 108 153ms 21 Aug 2024 582nd AnAwesomGuy 736 92 10ms 22 Sep 2025 582nd HumanoidCPU 736 92 10ms 25 Dec 2025 584th antimon2 🇯🇵 736 97 1,014ms 11 Jan 2025 585th primo-ppcg 🇹🇭 736 173 445ms 4 Apr 2022 586th itsh01 735 133 9ms 3 Apr 2022 587th cmayer777 735 161 62ms 14 Oct 2022 588th lynn 734 60 39ms 17 Feb 2024 589th snoozingnewt 🇨🇦 734 176 98ms 2 Nov 2025 589th kaascevich 734 176 2,045ms 8 Dec 2025 591st JGDoerrer 734 181 137ms 20 Dec 2022 592nd scpchicken 🇵🇼 734 343 10ms 26 Mar 2022 593rd pschmid0 🇺🇸 733 120 5ms 7 Nov 2022 593rd arobson13 🇨🇦 733 120 4ms 28 Apr 2023 595th annaproxy 733 133 1ms 4 Jun 2023 595th kkoenig 733 133 1ms 30 Dec 2023 597th Shanethegamer 🇺🇸 732 146 5ms 10 Mar 2023 598th Yewzir 🇧🇪 732 174 484ms 2 Oct 2025 599th KatieLG-Transpiler 🇬🇧 732 344 10ms 4 Dec 2022 600th Yewzir 🇧🇪 731 133 1ms 22 May 2023 601st Phil-RGOMEGA 731 152 2ms 4 May 2023 602nd emgordon154 731 190 1ms 9 Jun 2025 603rd snoozingnewt 🇨🇦 731 194 294ms 2 Nov 2025 604th CaedenHarper 🇨🇦 730 110 965ms 22 Oct 2025 605th dokutan 730 162 453ms 30 Mar 2025 606th Xzyaihni 730 182 142ms 3 Jan 2023 607th zacjl 729 122 7ms 18 days ago 608th dokutan 729 223 1ms 15 Aug 2024 609th Irratix 🇳🇱 728 93 10ms 7 May 2022 610th madex 🇩🇪 728 134 2ms 28 Mar 2022 610th tsunderu 🇯🇵 728 134 1ms 25 Feb 2023 612th Shanethegamer 🇺🇸 728 135 70ms 1 Dec 2024 613th IISResetMe 727 94 293ms 12 Jan 2026 614th edsrzf 🇳🇿 727 121 4ms 5 Mar 2025 615th Shanethegamer 🇺🇸 727 163 445ms 10 Mar 2023 616th CaedenHarper 🇨🇦 727 346 10ms 24 Jan 2025 617th TrueBoxGuy 726 154 126ms 23 Jul 2023 618th Yewzir 🇧🇪 726 163 56ms 25 May 2023 619th bbb651 🇮🇱 726 183 146ms 31 May 2022 620th sisyphus-ppcg 🇦🇺 725 75 117ms 16 Feb 2023 621st targrik 724 135 9ms 25 Feb 2025 622nd dokutan 724 166 393ms 15 Aug 2024 623rd adriweb 🇫🇷 723 135 2ms 19 Aug 2024 624th MeWhenI 🇻🇦 721 122 4ms 29 May 2023 625th JunkIce 720 94 10ms 13 Feb 2025 625th ryyyn 🇺🇸 720 94 12ms 15 Jan 2026 627th ericlangedijk 🇸🇮 720 167 432ms 27 Mar 2022 627th sabvdf 720 167 419ms 8 Dec 2022 627th aliakseikalosha 720 167 406ms 8 Aug 2024 627th snoozingnewt 🇨🇦 720 167 407ms 2 Nov 2025 631st msbranicky 720 197 301ms 24 Aug 2023 632nd DialFrost 🇸🇬 717 112 957ms 4 Sep 2025 633rd cmayer777 717 136 1ms 14 Oct 2022 634th Irratix 🇳🇱 717 165 460ms 14 May 2022 635th janbehrens 🇩🇪 716 178 429ms 16 Nov 2022 635th snoozingnewt 🇨🇦 716 178 539ms 2 Nov 2025 637th snoozingnewt 🇨🇦 715 211 59ms 2 Nov 2025 638th destofr 713 199 359ms 23 Aug 2022 639th ovs-code 🇩🇪 712 91 442ms 16 Jan 2024 640th MeWhenI 🇻🇦 712 96 262ms 28 Jan 2023 First Prev 561–640 of 2,314 Next Last