The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 25 hours. Why not try and solve them ahead of time?
Trinomial Triangle 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 401st Andrey2001 621 79 398ms 28 Jan 2026 402nd kmathis22 618 149 552ms 7 Dec 2025 403rd Mabeloid 🇳🇴 612 86 10ms 14 Oct 2025 404th KasperKivimaeki 🇫🇮 611 107 2ms 27 Oct 2025 405th snoozingnewt 🇨🇦 603 100 9ms 1 Oct 2025 406th snoozingnewt 🇨🇦 599 182 300ms 1 Oct 2025 407th RaBa21 🇭🇺 598 88 9ms 1 Aug 2025 407th StefanHabel 🇨🇦 598 88 10ms 13 days ago 409th retrohun 598 90 8ms 2 Oct 2025 410th MeWhenI 🇻🇦 598 128 157ms 14 Nov 2025 411th LukeBridges 🇬🇧 597 101 9ms 7 Oct 2025 411th acollett89 597 101 10ms 12 hours ago 413th blaztoma 🇱🇹 593 200 26ms 30 Sep 2025 414th nstearns96 🇬🇧 591 89 10ms 3 Oct 2025 414th Emutis 🇱🇹 591 89 9ms 6 Oct 2025 416th albanian-laundromat 591 128 117ms 30 Sep 2025 417th madeforlosers 585 103 15ms 13 Oct 2025 418th stefangimmillaro 583 117 40ms 8 Oct 2025 419th MeWhenI 🇻🇦 582 141 122ms 8 Nov 2025 420th dokutan 582 1,635 2ms 6 Oct 2025 421st snoozingnewt 🇨🇦 580 143 1,322ms 30 Sep 2025 422nd frankgraziano 579 362 13ms 15 Oct 2025 423rd KatieLG 🇬🇧 577 84 3ms 30 Sep 2025 424th snoozingnewt 🇨🇦 574 150 458ms 4 Oct 2025 425th jgbaldwinbrown 573 114 2ms 26 Jan 2026 426th aviyanp 573 180 29ms 15 Oct 2025 427th Natanaelel 🇸🇪 572 71 4ms 18 Jan 2026 428th aalec 572 92 10ms 9 Nov 2025 429th ShiraJoseph 🇺🇸 569 106 9ms 12 Oct 2025 430th snoozingnewt 🇨🇦 569 138 3ms 1 Oct 2025 431st rucin93 🇵🇱 568 162 366ms 12 Oct 2025 432nd Blendi-Goose 566 136 1ms 6 Oct 2025 433rd snoozingnewt 🇨🇦 560 97 1,250ms 1 Oct 2025 434th stefangimmillaro 558 108 9ms 9 Oct 2025 435th stefangimmillaro 556 1,711 1ms 19 Oct 2025 436th edsrzf 🇳🇿 555 90 1ms 8 Oct 2025 437th tomh1012 555 158 424ms 1 Oct 2025 438th Ripick 553 150 366ms 6 Oct 2025 439th snoozingnewt 🇨🇦 551 149 107ms 1 Oct 2025 440th snoozingnewt 🇨🇦 550 166 153ms 1 Oct 2025 441st andrewjc2000 548 96 21ms 3 Oct 2025 442nd Matter1024 🇮🇳 546 82 36ms 18 Jan 2026 443rd MeWhenI 🇻🇦 543 92 1ms 12 Nov 2025 444th dokutan 540 83 35ms 18 Aug 2025 445th snoozingnewt 🇨🇦 539 108 1,142ms 1 Oct 2025 446th Yax42 🇫🇷 538 112 10ms 21 Jan 2026 447th robin-scragg 532 99 11ms 21 Oct 2025 448th snoozingnewt 🇨🇦 530 86 257ms 1 Oct 2025 449th snoozingnewt 🇨🇦 527 85 36ms 1 Oct 2025 450th AlephSquirrel 525 40 3ms 4 Nov 2025 451st IISResetMe 524 87 296ms 2 Dec 2025 452nd TheZwierzLF 🇵🇱 522 94 464ms 25 Nov 2025 453rd snoozingnewt 🇨🇦 522 145 125ms 1 Oct 2025 454th luuumine 🇫🇷 522 175 173ms 29 Nov 2025 455th albanian-laundromat 505 99 2ms 5 Oct 2025 456th albanian-laundromat 504 107 152ms 30 Sep 2025 457th CaedenHarper 🇨🇦 502 217 325ms 2 Dec 2025 458th snoozingnewt 🇨🇦 500 42 2ms 1 Oct 2025 459th Jacob385 500 184 441ms 10 Nov 2025 460th snoozingnewt 🇨🇦 498 141 9ms 1 Oct 2025 461st mbittner20 496 106 9ms 5 Oct 2025 462nd CaedenHarper 🇨🇦 495 177 384ms 17 Oct 2025 463rd IanUtley 493 158 114ms 15 Oct 2025 464th namelessiw 492 107 31ms 2 Oct 2025 464th celiendonze 🇨🇭 492 107 9ms 14 Oct 2025 466th snoozingnewt 🇨🇦 489 83 2ms 1 Oct 2025 467th blaztoma 🇱🇹 488 118 5ms 1 Oct 2025 468th 0xjac 🇨🇭 485 225 301ms 4 Jan 2026 469th dvckyduck 🇧🇬 483 109 11ms 24 Oct 2025 469th andre-lameirinhas 🇵🇹 483 109 16ms 12 Nov 2025 471st lacrosse 482 93 34ms 27 Nov 2025 472nd dokutan 478 161 2ms 24 Oct 2025 473rd raphaelimahorn 475 127 10ms 11 days ago 474th h3ra993huskp 🇯🇵 472 195 596ms 30 Nov 2025 475th blaztoma 🇱🇹 464 174 38ms 30 Sep 2025 476th mathieurodic 462 114 9ms 21 Oct 2025 476th webmiche 462 114 10ms 2 Nov 2025 478th snoozingnewt 🇨🇦 459 191 417ms 4 Oct 2025 479th snoozingnewt 🇨🇦 456 169 1ms 1 Oct 2025 480th Shanethegamer 🇺🇸 456 2,086 1ms 27 Nov 2024 First Prev 401–480 of 1,024 Next Last