1gravity LLC

Sudoku4ever Free

feature graphics



Sudoku4ever offers unlimited game play, eight Sudoku variants, eight difficulty levels, world-class hint engine, game statistics and much more.

Our main focus for this application is:

  • to deliver unlimited game play with high quality Sudoku puzzles that keep you entertained for as long as you wish
  • to keep the user interface as easy as possible without cutting down on functionality
  • to offer good usability on all Android devices regardless of screen size and resolution


  • Eight different Sudoku variants: Classic & Jigsaw puzzles (aka Squiggly), Asterisk-, Centerdot-, Color-, Hyper-, Percent- & X-Sudokus
  • Eight difficulty levels: very easy, easy, moderate, advanced, hard, very hard, fiendish, nightmare
  • Six input methods: digit first, cell first, mixed, Andoku cell first, Andoku digit first, popup
  • Pencil marks with auto set or auto erase
  • Persistent undo/redo
  • Highlighting of selected digits and pencil marks
  • Highlighting of incorrect digits
  • Highlighting of completed digits
  • Bookmarks
  • Auto save
  • Coloring: coloring techniques are supported by a unique coloring mode for expert players
  • Statistics: keep track of your records for each difficulty level and for each Sudoku variant
  • Analysis functionality to rate the difficulty of a Sudoku puzzle and to get a detailed list of required solving techniques
  • Hints: the world's best hint engine with unique three-step on-board visualization, supporting the following solving techniques:
    - Full House
    - Hidden Single
    - Hidden Subset (Pair, Triple + Quad)
    - Naked Single
    - Naked Subset (Pair, Triple + Quad)
    - Locked Candidates (Pointing + Claiming)
    - X-Wing (Regular, Finned + Sashimi)
    - Swordfish (Regular, Finned + Sashimi)
    - Jellyfish (Regular, Finned + Sashimi)
    - W-Wing
    - Almost Locked Candidates (Pair, Triple + Quad)
    - Avoidable Rectangle (type 1 + 2)
    - Hidden Unique Rectangle
    - Uniqueness Test (type 1, 2, 3, 4 + 5)
    - BUG+1, BUG+2, BUG+3 and BUG+4
    - Aligned Pair + Triple Exclusion
    - Sue de Coq
    - ALS-XZ, ALS-XY-Wing
    - Remote Pairs
    - Bidirectional Cycles
    - Forcing X-Chains
    - Forcing XY-Chains
    - Nishio Forcing Chains
    - Double Forcing Chains
    - Contradiction Forcing Chains
    - Region Forcing Chains
    - Cell Forcing Chains
  • The free version of this app is supported by unobtrusive ads


Start Screen


Play Screen


Hint Engine (Classic Sudoku)


Hint Engine (Jigsaw Puzzle)


Analysis Function (Hyper Sudoku)


Coloring Mode


You can download the application:

  • from Google Play on your mobile device (search for Sudoku4ever)
  • from Google Play on the web: Sudoku4ever Free
  • by scanning the following QR Code (Google Play):
    QR Code
  • from the Amazon Appstore for Android:

    Amazon Appstore