The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Leap Years in Java 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 80th Re-Adventures 🇮🇳 558 113 367ms 19 Mar 2021 80th lukehewittvandy 558 113 409ms 24 May 2021 80th fisherthomas14 558 113 426ms 24 May 2021 80th JC-ProgJava 558 113 409ms 9 Jan 2022 80th bob-th 558 113 426ms 30 Jun 2022 80th pandaninjas 558 113 364ms 1 Nov 2022 80th dteague3989 558 113 407ms 25 May 2023 80th DihydrogenMonoxideH2O 558 113 378ms 28 Jan 2025 89th b10011 🇫🇮 553 114 366ms 29 Jun 2020 89th richard-oelze 🇩🇪 553 114 383ms 16 Nov 2020 89th stordev 553 114 417ms 26 Feb 2021 89th AIn0n 553 114 419ms 19 Aug 2021 89th Carloz69 553 114 393ms 3 Dec 2021 89th bsoyka 🇺🇸 553 114 406ms 9 Jan 2022 89th DardS8Br 553 114 392ms 3 Nov 2023 96th GnotAGnelf 548 115 401ms 24 Nov 2020 96th eecb 548 115 422ms 24 Nov 2020 96th JustRevDice 548 115 431ms 6 Dec 2021 96th Seanharrs 🇦🇺 548 115 377ms 15 Dec 2021 96th BrianWanamaker 548 115 407ms 2 Nov 2023 96th Benzas01 548 115 415ms 5 Oct 2025 102nd jetzerv 543 116 399ms 18 Dec 2020 102nd riviere-lucas 543 116 400ms 28 Dec 2020 102nd louisbosqui 543 116 399ms 28 Dec 2020 102nd Nick-NCSU 543 116 411ms 1 Nov 2021 102nd bwat2 543 116 399ms 21 Apr 2022 102nd OriEy 543 116 410ms 26 Apr 2023 102nd mathislife22 543 116 409ms 31 Aug 2023 102nd crizin 🇰🇷 543 116 433ms 9 Sep 2023 110th jjstreet 538 117 436ms 24 Nov 2020 110th ReidZ3 🇺🇸 538 117 391ms 28 Nov 2020 110th JacobStanleyJones 538 117 369ms 5 Sep 2021 110th joshuaxie8 538 117 440ms 9 Jul 2025 114th mathwiz42 534 118 387ms 17 Aug 2020 114th Omega65536 🇩🇪 534 118 386ms 7 Jan 2021 114th logancammish2 534 118 404ms 6 Feb 2021 114th azka1368 534 118 436ms 24 Nov 2023 114th roguh 🇬🇹 534 118 415ms 14 Jan 2024 114th atazzam 🇺🇸 534 118 385ms 28 Jan 2025 120th fullerlee 529 119 414ms 30 Nov 2020 120th riccetn 529 119 387ms 7 Jul 2022 120th Siri-chan 529 119 365ms 8 Jan 2025 123rd melisakmc 525 120 388ms 1 Feb 2022 124th elefavour 521 121 390ms 6 Jan 2025 124th matas132 521 121 409ms 16 Sep 2025 126th StronkCheese 🇺🇸 516 122 403ms 27 Jan 2023 126th Sora1248 🇩🇪 516 122 396ms 19 Feb 2023 126th 1231234md5 🇨🇳 516 122 413ms 11 Dec 2023 129th Smetalo 512 123 400ms 25 Aug 2022 129th Maximizer02 512 123 412ms 18 Oct 2023 129th onsagere 512 123 427ms 5 Oct 2024 132nd EFHIII 508 124 410ms 16 Aug 2020 132nd StirFrySauce 508 124 373ms 28 Jan 2025 134th sech1p 🇵🇱 504 125 407ms 30 Oct 2020 134th EthanGrant1 504 125 421ms 13 Apr 2022 136th amber1093 500 126 426ms 22 Feb 2024 136th PanNessMain 500 126 413ms 10 Oct 2024 138th Robi1718 496 127 404ms 6 Dec 2021 138th Trujillo707 496 127 397ms 18 Sep 2025 140th Larsen2328 492 128 417ms 27 Apr 2021 140th TrixTrl 492 128 402ms 19 Nov 2021 140th Grrine 492 128 390ms 28 Jan 2025 143rd rachitkeyal 488 129 373ms 10 Nov 2022 143rd ShepardToTheStars 488 129 402ms 5 Jan 2024 143rd tik25 488 129 406ms 28 Mar 2024 146th daetz 485 130 406ms 8 Aug 2020 147th slammer903 477 132 391ms 24 Oct 2022 147th Yareeeema 477 132 399ms 26 Jan 2024 149th noahdorsch 474 133 399ms 15 Jul 2024 150th vSweePerxX 470 134 407ms 26 Feb 2021 151st HalvorOverby 467 135 406ms 22 Dec 2021 152nd achow0 463 136 415ms 12 Aug 2020 152nd gthayden23 463 136 403ms 5 Oct 2024 154th WilleyOhana 444 142 380ms 12 Oct 2020 155th Zstr25 434 145 394ms 10 Sep 2025 156th artisiole 🇺🇸 414 152 357ms 4 Mar 2022 157th 0dyse 412 153 454ms 15 Apr 2025 158th GWStuart 406 155 405ms 15 Sep 2023 159th jackdonofrio 389 162 393ms 26 Sep 2020 159th Pyro569 389 162 380ms 30 Jul 2023 First Prev 81–160 of 172 Next Last
