The Lantern event helps you complete levels in the town.
There are 3 stages to activate a Lantern. These stages grant boosters at the start of a level and additional moves.
If you pass a level without losing, the Lantern moves to the next stage, and the number of bonuses increases. If you lose, the Lantern gets extinguished and moves down a stage. In this case, you should win a level again to raise the Lantern's activation stage and get more bonuses at the beginning of a level. If you lose on the first stage of the Lantern's activation, you begin the next level without your starting boosters.
After the third and final stage, the Lantern does not proceed to additional stages after you complete further levels without losing. If you do not lose, you receive the bonuses of the third stage until the event is over.