While playing the game, press Start to display the options menu. Although the touch screen is hidden, the timer will stop. You can then look at the top screen and take as much time as desired to determine your next move. Resume the game, make your move, then pause the game again and repeat.
Unlock the following stars by completing the corresponding tasks:
STARS - HOW TO UNLOCK 4 stars - Complete a Practice or Easy puzzle in 5 minutes or less. 5 stars - Complete a Normal puzzle in 10 minutes or less. 6 stars - Complete a Hard puzzle in 15 minutes or less.
Each level has a different number of stars you can get. "Practice" and "Easy" give you a maximum of four stars. "Normal" gives you a maximum of five stars. "Hard" has a maximum of six stars. After collecting twenty stars, new levels will become unlocked.