The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
π 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 801st rucin93 🇵🇱 624 181 419ms 24 Sep 2025 801st namelessiw 624 181 559ms 15 Nov 2025 803rd MeWhenI 🇻🇦 623 165 52ms 29 Apr 2025 804th GalladeGuy 🇺🇸 623 180 41ms 25 May 2020 805th yzhs 🇩🇪 621 165 3ms 13 Sep 2020 805th Iznoanygod 🇺🇸 621 165 4ms 19 Dec 2024 807th DialFrost 🇸🇬 620 61 2,193ms 31 Jan 2023 808th NatNgs 620 94 15ms 7 Jan 2020 809th MeepMoop 619 181 145ms 10 Apr 2025 810th mjecke 618 48 2,052ms 3 Jul 2023 810th kurkale6ka 618 48 2,021ms 15 Dec 2025 812th Nietchev 618 92 142ms 5 Dec 2021 812th ImpressedByRocks 618 92 896ms 22 May 2025 814th MeWhenI 🇻🇦 618 217 124ms 28 Jul 2023 815th CaedenHarper 🇨🇦 617 183 529ms 30 Oct 2025 815th MeWhenI 🇻🇦 617 183 527ms 7 Nov 2025 817th pardouin 🇫🇷 615 73 937ms 1 Dec 2025 818th BREMAUCY 🇫🇷 614 88 529ms 6 Dec 2025 819th olivermrose 🇺🇸 613 95 12ms 15 Sep 2021 819th KatieLG 🇬🇧 613 95 13ms 5 Oct 2025 821st KatieLG 🇬🇧 611 93 146ms 1 Nov 2020 821st CarsonChr 🇺🇸 611 93 11ms 21 Sep 2022 821st Yewzir 🇧🇪 611 93 15ms 27 May 2023 824th Yewzir 🇧🇪 611 278 17ms 3 days ago 825th stefangimmillaro 610 185 451ms 6 Oct 2025 826th JOrE20 609 44 63ms 24 Feb 2026 827th MeWhenI 🇻🇦 609 394 863ms 29 Aug 2023 828th Sparky83 607 96 12ms 19 Oct 2023 829th RustemB 🇷🇺 605 49 2,023ms 10 Apr 2021 829th 0dyse 605 49 161ms 7 May 2025 831st cure-honey 🇯🇵 604 227 987ms 7 Jul 2021 832nd Mabeloid 🇳🇴 603 235 122ms 26 Oct 2025 833rd boxjelly 602 170 3ms 7 Feb 2021 834th Whinarn 602 242 297ms 25 Apr 2020 835th alphafalfa 601 63 3,189ms 19 Dec 2024 836th Athe81 601 97 12ms 8 Jan 2021 837th dokutan 601 236 126ms 11 Jan 2024 838th snoozingnewt 🇨🇦 599 229 160ms 21 Nov 2025 839th annaproxy 598 68 42ms 27 Aug 2022 840th dokutan 598 75 783ms 14 Feb 2026 841st quimey 598 95 81ms 16 Mar 2023 842nd Fvirgilio 596 230 472ms 30 Aug 2025 843rd Posandu 595 98 14ms 23 Oct 2022 844th Yewzir 🇧🇪 595 144 58ms 8 Apr 2024 845th RYNO8 595 172 3ms 5 Jan 2022 846th CatsAreFluffy 594 91 452ms 15 Jan 2024 846th HumanoidCPU 594 91 419ms 2 Jul 2024 848th Yewzir 🇧🇪 594 245 274ms 3 Jan 2024 849th Ripick 593 50 1,976ms 26 Jun 2025 850th dokutan 593 231 89ms 23 Jul 2025 851st Juici 593 239 134ms 18 Sep 2020 852nd MeWhenI 🇻🇦 591 230 436ms 15 Nov 2022 853rd caasinehc 589 99 11ms 6 Nov 2019 853rd Bonjour27891 🇻🇳 589 99 11ms 12 Mar 2022 855th duckyluuk 🇳🇱 589 117 2,696ms 29 Oct 2024 856th dokutan 589 247 277ms 4 Jan 2024 857th flawr 588 111 726ms 2 Jan 2019 858th cingulataluke 586 97 16ms 26 Aug 2023 859th rowan-OzRunways 586 234 708ms 14 Oct 2023 860th AlephSquirrel 583 46 55ms 10 Feb 2023 861st Secozzi 583 100 11ms 21 Mar 2021 862nd Yewzir 🇧🇪 581 93 441ms 15 Jan 2024 862nd KatieLG 🇬🇧 581 93 507ms 28 Oct 2024 864th emgordon154 581 244 126ms 26 Feb 2025 864th elgan65536 🇺🇸 581 244 126ms 7 Feb 2026 866th lynn 579 177 3ms 22 May 2021 867th MeWhenI 🇻🇦 578 168 481ms 13 Oct 2023 868th unfinishedprogram 577 101 13ms 10 Aug 2022 869th janbehrens 🇩🇪 576 88 307ms 3 Dec 2023 870th fantaize 576 246 150ms 15 days ago 871st MeWhenI 🇻🇦 575 149 52ms 12 Nov 2022 872nd bac0id 574 99 16ms 26 Sep 2023 873rd yokasuretsu 573 71 40ms 15 Apr 2018 873rd Irratix 🇳🇱 573 71 51ms 27 Jun 2022 875th f-tucker 572 179 5ms 4 Jul 2025 876th tomh1012 571 102 12ms 1 Oct 2020 876th HumanoidCPU 571 102 16ms 21 Feb 2025 876th Yax42 🇫🇷 571 102 10ms 5 Sep 2025 879th Shanethegamer 🇺🇸 571 110 1,242ms 2 Jun 2022 880th yuchuehw 570 52 1,968ms 2 Jun 2024 First Prev 801–880 of 4,230 Next Last