Match 3 done different.
Draw lines through gems to clear them and earn points. The more gems you link together, the more points you earn.
You have to hold a balance between clearing long lines and making short combos. Longer lines will help you finish a level but making combos will make the progress bar drain slower.
The aim is to score as many points as possible before the time runs out. There are power-ups to collect and you progress through the levels.