The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 31 hours. Why not try and solve them ahead of time?
Spelling Numbers 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 albanian-laundromat 544 193 533ms 9 Aug 2025 482nd Meowsan91 🇨🇿 543 489 413ms 21 Nov 2021 483rd user189032 542 307 15ms 29 May 2019 484th CatsAreFluffy 542 484 75ms 14 Dec 2022 484th tailorspy 542 484 1,420ms 10 Mar 2024 486th jatloe 541 206 16ms 28 Oct 2024 486th snoozingnewt 🇨🇦 541 206 19ms 20 Feb 2026 488th msbranicky 541 383 4ms 11 Oct 2023 489th raphaelimahorn 540 308 11ms 26 Oct 2022 490th bizy-coder 536 196 638ms 17 Jan 2024 491st yzhs 🇩🇪 536 208 15ms 25 Oct 2020 492nd olleicua 🇺🇸 535 217 41ms 21 Jan 2024 493rd nathanadams 🇳🇿 535 311 12ms 20 Sep 2021 494th lynn 535 479 1,036ms 25 Jul 2021 495th JGDoerrer 535 491 465ms 17 Jan 2022 496th nwellnhof 🇩🇪 533 140 214ms 11 May 2023 497th GolfingSuccess 🇬🇷 533 209 15ms 16 Nov 2023 498th janbehrens 🇩🇪 532 493 2,999ms 20 Nov 2022 499th Attero 🇸🇪 531 210 13ms 25 Sep 2020 500th prestosilver 🇺🇸 531 407 4ms 5 Dec 2025 501st jared-hughes 530 408 4ms 10 Sep 2022 502nd trinityy-7 528 315 12ms 15 Mar 2024 503rd galloj 🇨🇿 528 361 277ms 26 Feb 2023 504th cmdrsabre 527 257 945ms 7 Feb 2020 505th btjones0 526 212 20ms 15 Jul 2022 505th neel11235813 526 212 21ms 16 Jan 2023 507th DialFrost 🇸🇬 524 357 24ms 4 Feb 2023 508th dokutan 523 318 13ms 3 Dec 2025 509th janbehrens 🇩🇪 522 319 14ms 30 Nov 2024 510th Shanethegamer 🇺🇸 522 394 182ms 1 Dec 2024 511th Seek64 🇩🇪 521 214 15ms 18 Mar 2025 512th MeWhenI 🇻🇦 520 304 1,441ms 15 Sep 2025 513th prestosilver 🇺🇸 520 320 11ms 4 days ago 514th dokutan 518 215 15ms 24 Oct 2025 515th Salutations45 518 321 16ms 10 Nov 2024 516th chartung17 518 460 417ms 1 Jan 2024 517th dgerblick 517 322 11ms 16 Jun 2023 518th SB-945 516 216 14ms 25 Mar 2024 518th 5cw 🇺🇸 516 216 21ms 9 Nov 2024 520th MeWhenI 🇻🇦 514 217 15ms 22 Oct 2021 521st clockworknazo 514 364 15ms 9 Aug 2023 522nd gastropner 512 513 445ms 16 Jul 2025 523rd jared-hughes 510 326 18ms 10 Sep 2022 524th JunkIce 507 220 21ms 13 Feb 2025 525th junkondo-jp 507 328 15ms 11 May 2024 526th xnor-gate 504 221 37ms 6 Apr 2021 526th ryyyn 🇺🇸 504 221 37ms 28 Oct 2025 528th pg98 504 330 13ms 16 Aug 2019 529th BambooleanLogic 🇸🇪 503 331 11ms 6 Jul 2023 530th chartung17 502 222 15ms 1 Jan 2024 531st didion0 🇺🇸 501 332 12ms 2 Feb 2021 532nd olivermrose 🇺🇸 500 333 12ms 30 Aug 2021 532nd DayDun 🇸🇪 500 333 12ms 19 Jan 2023 532nd weliveinhell 🇭🇹 500 333 13ms 2 Feb 2024 535th MeWhenI 🇻🇦 498 203 44ms 4 Sep 2024 536th TFeld00 🇩🇰 498 224 21ms 4 Nov 2020 537th janbehrens 🇩🇪 497 351 23ms 28 May 2021 538th neel11235813 496 212 443ms 15 Jan 2024 539th RedstoneTim 495 336 11ms 1 Aug 2021 540th hyvyys 495 553 7ms 21 Jul 2019 541st antimon2 🇯🇵 492 279 1,614ms 23 Nov 2023 542nd Shanethegamer 🇺🇸 492 385 3ms 27 Oct 2024 543rd ovs-code 🇩🇪 491 214 458ms 5 Feb 2026 543rd dokutan 491 214 397ms 14 Feb 2026 545th zach333 491 227 14ms 12 Jul 2024 546th retrohun 490 356 17ms 29 Oct 2019 547th adamnielson42 🇺🇸 486 542 29ms 11 Jan 2024 548th LukeBridges 🇬🇧 485 343 16ms 15 Oct 2024 549th jared-hughes 485 360 661ms 22 Apr 2022 550th baumpilz 485 492 459ms 20 Jan 2021 551st Shanethegamer 🇺🇸 484 468 105ms 17 Dec 2024 552nd cure-honey 🇯🇵 483 823 56ms 27 Apr 2020 553rd janbehrens 🇩🇪 482 449 2ms 21 Mar 2022 554th zakariamouhid 481 346 13ms 4 Jun 2023 555th StefanHabel 🇨🇦 480 232 14ms 12 days ago 556th prplz 🇦🇺 479 452 3ms 11 Oct 2019 557th JunkIce 478 220 503ms 13 Feb 2025 558th Fishron 478 233 15ms 23 Oct 2021 558th rollershutter 478 233 20ms 17 Apr 2024 560th saito-ta 🇯🇵 477 199 13ms 2 Feb 2024 First Prev 481–560 of 1,081 Next Last