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?
Lucky Numbers in all languages in bytes. 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 Bytes Time Submitted 719th acollett89 561 102 29ms 18 Jul 2025 722nd snoozingnewt 🇨🇦 560 110 309ms 17 Feb 2026 723rd heanyang1 560 200 287ms 29 May 2025 724th olleicua 🇺🇸 558 80 83ms 21 Feb 2025 724th TheZwierzLF 🇵🇱 558 80 1,933ms 25 Dec 2025 726th adamnielson42 🇺🇸 558 94 60ms 21 Aug 2023 726th brochmann 🇸🇪 558 94 12ms 28 Oct 2023 726th 40fied4t 558 94 37ms 1 Jun 2025 729th HumanoidCPU 558 119 139ms 7 Nov 2024 730th kkoenig 558 201 292ms 7 Sep 2025 731st HumanoidCPU 555 202 284ms 26 Aug 2024 732nd albanian-laundromat 554 260 2,813ms 23 Oct 2025 733rd varhammer 553 153 210ms 13 Dec 2023 734th CatsAreFluffy 553 157 79ms 10 Jan 2023 735th kmathis22 553 166 463ms 23 Dec 2025 736th m42km 552 95 49ms 16 Dec 2023 736th Natanaelel 🇸🇪 552 95 29ms 15 Jul 2025 738th TheLazySquid 550 104 190ms 26 Sep 2024 739th MeWhenI 🇻🇦 549 101 2,081ms 15 Sep 2025 740th j-Ewan 547 96 104ms 4 Mar 2022 740th nullie 547 96 82ms 9 Jun 2022 740th andrewjc2000 547 96 29ms 28 Jul 2025 740th Bmrl7 547 96 130ms 24 Dec 2025 744th emgordon154 547 205 306ms 18 Jan 2025 745th Lv0Sys 🇵🇱 544 82 99ms 27 days ago 746th rifatx 544 147 503ms 16 Jul 2024 747th Deedogg 541 97 42ms 9 Sep 2024 747th IsaacAlexBarden 541 97 28ms 13 Feb 2025 747th albanian-laundromat 541 97 3,924ms 11 May 2025 750th albanian-laundromat 541 125 134ms 20 Aug 2025 751st 0xjac 🇨🇭 541 207 308ms 7 Jun 2025 752nd hamhub7 540 148 465ms 8 Aug 2022 753rd Re-Adventures 🇮🇳 539 106 27ms 1 Feb 2023 754th jacobly0 🇺🇸 539 208 281ms 17 Aug 2023 755th DialFrost 🇸🇬 538 142 491ms 3 May 2025 756th Shanethegamer 🇺🇸 538 167 146ms 27 Sep 2024 757th SirFireball3521 537 85 764ms 15 Mar 2023 758th sleepyStick 535 98 10ms 11 Mar 2022 758th damoose717 535 98 11ms 24 May 2025 760th Yewzir 🇧🇪 535 278 1,874ms 15 Nov 2025 761st rifatx 534 210 300ms 17 Jul 2024 762nd retrohun 533 100 592ms 1 Mar 2022 763rd snyderek 🇺🇸 532 163 77ms 17 Oct 2024 764th denkyuu1 531 84 2,791ms 5 hours ago 765th Andrey135296 530 99 198ms 29 Nov 2024 766th Protothor 529 108 12ms 21 Jun 2025 767th edsrzf 🇳🇿 529 212 287ms 8 Nov 2024 768th MeWhenI 🇻🇦 528 93 449ms 15 Feb 2023 769th janbehrens 🇩🇪 527 87 4ms 6 Apr 2022 769th blaztoma 🇱🇹 527 87 35ms 24 Nov 2025 771st ibexq 527 131 11ms 2 May 2023 772nd annaproxy 526 152 408ms 28 Mar 2022 773rd JGDoerrer 526 173 167ms 5 Apr 2022 774th Fishron 525 100 91ms 18 Jun 2022 774th vishwathg 525 100 112ms 5 Oct 2023 774th 4ndyJ 🇬🇧 525 100 220ms 23 Dec 2023 774th chartung17 525 100 114ms 1 Jan 2024 778th janbehrens 🇩🇪 522 153 385ms 3 Mar 2022 779th GolfinK 521 53 35ms 22 Nov 2024 780th JRaspass 🇬🇧 521 215 287ms 7 Feb 2024 781st XenThe 🇬🇧 520 110 13ms 6 Jul 2025 782nd celiendonze 🇨🇭 519 101 108ms 18 Jul 2023 782nd namelessiw 519 101 115ms 13 Jul 2024 782nd moustave 519 101 225ms 3 Dec 2024 782nd Andre3582 519 101 12ms 8 Oct 2025 786th MeWhenI 🇻🇦 519 147 1,314ms 10 Mar 2022 787th kmathis22 519 216 276ms 10 Oct 2025 788th CatsAreFluffy 515 134 15ms 27 Jan 2023 789th janbehrens 🇩🇪 515 157 478ms 24 Mar 2022 790th inverseLorentz 🇦🇺 514 102 12ms 5 May 2023 790th cingulataluke 514 102 48ms 29 Aug 2023 790th wh3n3v3r 🇨🇿 514 102 27ms 12 Nov 2024 790th WillowWispy 514 102 31ms 17 Mar 2025 790th mousetail 🇳🇱 514 102 293ms 26 Sep 2025 790th madeforlosers 514 102 12ms 11 Nov 2025 796th madex 🇩🇪 511 144 3,122ms 11 days ago 797th JRaspass 🇬🇧 510 90 21ms 22 Sep 2022 798th Bonjour27891 🇻🇳 509 103 43ms 4 Mar 2022 798th AlexanderFair 509 103 857ms 25 Jul 2023 798th CheeseCake628 🇳🇴 509 103 34ms 23 Dec 2023 First Prev 721–800 of 1,586 Next Last