1. Launch the "Solitaire 15in1 Collection" app on your mobile device.

2. From the main menu, select the solitaire variant you wish to play, such as Freecell, Klondike, or one of the other 13 included modes.

3. Each game starts with a shuffled deck of cards arranged in a layout specific to the chosen variant.

4. The objective in all variants is to move all cards from the tableau to the foundation piles, following the rules of the selected game.

5. Cards in the tableau can usually be moved in descending order and alternating colors, though this varies by mode.

6. Tap and drag cards or stacks to reposition them into legal moves, or use tap-to-move controls for convenience.

7. Empty tableau spaces can often be filled with specific cards, like Kings in Klondike or any card in Freecell, depending on the game.

8. Build foundation piles in ascending order by suit, starting from Ace to King.

9. Use the undo button if you make a mistake or want to try a different strategy.

10. Some variants allow drawing cards from a stockpile; tap the deck to reveal new cards when needed.

11. Complete the game by transferring all cards to the foundation piles.

12. Try to beat your personal best by finishing faster or using fewer moves.

13. Explore all 15 solitaire modes for new challenges and gameplay styles.