Download the app, open it, and navigate through the tutorial or select a game mode from the home screen to begin your puzzle-solving journey.

On the main menu, tap on your preferred game mode (Regular, Mini, Wordoku, Killer, or Daily Challenge) to start playing that specific mode.

In the game, tap the settings icon and enable 'Auto Notes' to automatically record possible numbers as you fill in cells, aiding your solving process.

Tap the 'Hints' button during gameplay to receive a helpful clue; ensure hints are enabled in the settings if not visible.

Tap the difficulty selection option before starting a puzzle, and choose from Easy, Medium, Hard, Expert, or Custom according to your skill level.

Killer Sudoku combines traditional Sudoku with kakuro-like cages; puzzles involve sum targets for groups of cells. Select Killer Sudoku from game modes to play.

Play the Wordoku mode by selecting it from the main menu; use logic to place letters, and discover hidden words that serve as hints or solutions.

Sudoku Epic offers free puzzles, but you can access extra features or remove ads via in-app purchases through Settings > Store or Subscriptions.

Many puzzles are free, but premium options and daily challenges might require in-app purchases. Check Settings > Store for available options.

Try restarting the app or your device. If the issue persists, update the app via your app store or contact support through Settings > Help.