During the game you can use 2 power-ups that will help you a lot:
1. Shuffle
This powerup shuffles all the cards faced-down in the 7 columns of the board and the stack on top.
2. Magic Wand
Magic Wand finds the first missing card that can be placed on one of the top 4 piles. It extracts it from the 7 columns or the stack on top.