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 Tickets 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 481st Argeento 🇵🇱 540 152 11ms 25 Aug 2023 482nd bac0id 539 268 498ms 6 Jul 2024 483rd MeWhenI 🇻🇦 537 230 151ms 13 hours ago 484th NewDefectus 🇮🇱 536 48 3ms 24 Jan 2022 485th Naruyoko 530 155 15ms 6 Mar 2023 485th CaedenHarper 🇨🇦 530 155 13ms 4 Sep 2025 487th emgordon154 528 416 1,773ms 17 Sep 2025 488th helbling 🇨🇭 526 156 23ms 12 Jun 2024 489th KenanSi 525 49 3ms 24 Feb 2022 490th Natanaelel 🇸🇪 523 54 1,612ms 13 Feb 2024 491st Schmitt-Very-Cool 523 312 449ms 2 Oct 2025 491st CaedenHarper 🇨🇦 523 312 463ms 5 days ago 493rd bac0id 521 136 12ms 5 Jul 2024 493rd jacekwladzinski 521 136 10ms 5 Oct 2025 495th Shanethegamer 🇺🇸 520 228 486ms 14 Jul 2023 496th h3ra993huskp 🇯🇵 520 314 2,030ms 30 Nov 2025 497th iczelia 🇩🇪 519 158 12ms 23 Oct 2025 498th FlorianCassayre 🇫🇷 518 137 22ms 5 Aug 2025 499th yzhs 🇩🇪 518 219 164ms 25 Jul 2021 500th MeWhenI 🇻🇦 518 229 574ms 4 Mar 2022 501st didion0 🇺🇸 516 159 11ms 14 Feb 2022 501st uttumuttu 🇫🇮 516 159 10ms 6 Mar 2022 503rd schachmattmatt 514 138 22ms 29 Sep 2021 504th stefangimmillaro 513 204 762ms 18 Oct 2023 505th Shanethegamer 🇺🇸 511 366 1,332ms 24 Sep 2021 506th JOrE20 510 161 13ms 5 Feb 2026 507th targrik 505 200 9ms 10 hours ago 508th alemelis 504 132 400ms 6 Aug 2024 509th PeterTillema 🇳🇱 503 141 10ms 30 Mar 2023 509th TaserTheFox 🇺🇸 503 141 10ms 11 May 2023 509th stefangimmillaro 503 141 10ms 9 Nov 2023 509th GolfingSuccess 🇬🇷 503 141 10ms 12 Nov 2023 509th RaBa21 🇭🇺 503 141 12ms 11 Jul 2025 514th MeWhenI 🇻🇦 503 208 122ms 19 Oct 2022 515th albanian-laundromat 503 288 42ms 7 Sep 2025 516th coreynash 500 164 1,539ms 10 Nov 2023 517th marcin7Cd 499 142 17ms 7 Oct 2020 517th StefanHabel 🇨🇦 499 142 10ms 24 Dec 2022 517th scpchicken 🇵🇼 499 142 32ms 26 Jan 2023 517th mathisfun271 499 142 10ms 9 Feb 2024 521st commandz0 🇺🇸 496 143 10ms 6 Sep 2022 521st Alex-x90 🇺🇸 496 143 10ms 9 Jan 2023 521st YAJUE114514 496 143 11ms 27 Jul 2025 524th ChristophHornung 496 284 1,696ms 21 Nov 2021 525th tatzyr 🇯🇵 494 97 39ms 24 Feb 2025 525th KatieLG 🇬🇧 494 97 38ms 2 Oct 2025 527th janbehrens 🇩🇪 494 243 1,008ms 21 Mar 2022 527th c0d3-4-F00d 🇩🇪 494 243 2ms 23 May 2022 529th arctouch-cristiannevianna 493 286 1,049ms 4 Mar 2024 530th guilhem-roy 🇫🇷 492 144 10ms 21 Jul 2022 530th inventshah 492 144 34ms 16 Nov 2022 530th b10011 🇫🇮 492 144 10ms 16 Jan 2023 533rd MarcMush 🇫🇷 490 136 595ms 20 Oct 2021 534th fkantelberg 489 145 10ms 7 Aug 2023 534th mikehanus 489 145 10ms 23 Nov 2023 534th CLOStrophobic 🇮🇹 489 145 10ms 18 Feb 2025 537th MeWhenI 🇻🇦 488 207 5ms 28 May 2023 538th madex 🇩🇪 488 246 432ms 20 Jun 2025 539th InigoK 🇺🇸 486 146 21ms 22 Aug 2025 540th bac0id 486 247 2ms 6 Jul 2024 541st jared-hughes 484 154 250ms 17 Jul 2022 542nd neihousaigaai 483 170 11ms 8 Jun 2021 543rd jacklynnepenick 482 147 19ms 26 Aug 2021 543rd CaedenHarper 🇨🇦 482 147 30ms 9 Feb 2026 545th hiddicop 🇸🇪 479 100 2,914ms 30 Jan 2021 546th nstearns96 🇬🇧 479 148 10ms 9 Jan 2023 546th msbranicky 479 148 10ms 10 Jul 2023 548th bac0id 479 294 400ms 6 Jul 2024 549th janbehrens 🇩🇪 476 149 10ms 6 Jul 2023 550th MeWhenI 🇻🇦 476 201 9ms 9 May 2024 551st MeWhenI 🇻🇦 475 340 33ms 6 Jun 2023 552nd inventshah 474 135 496ms 16 Jan 2024 553rd aksyristos 473 150 10ms 11 days ago 554th jhcole 470 151 10ms 24 Apr 2020 554th rak1507 🇬🇧 470 151 10ms 28 Jun 2021 554th wh3n3v3r 🇨🇿 470 151 15ms 11 Nov 2024 554th yokasuretsu 470 151 10ms 2 Jan 2025 558th Shanethegamer 🇺🇸 469 262 6ms 4 Oct 2024 559th bizy-coder 467 137 501ms 24 Nov 2025 560th MeWhenI 🇻🇦 466 143 321ms 15 Feb 2023 First Prev 481–560 of 849 Next Last