To progress through the event stages, players need to collect event points (keys). These are awarded for successfully completing match-3 levels in the main game chain. The number of points received depends on the level difficulty:
A normal level awards 1 point.
A hard level awards 3 points.
A super-hard level awards 5 points.
Useful tips:
The level start button is located in the bottom-right corner.
The number on the button corresponds to the number of levels completed within a single pass.
The number on the button resets when a new pass starts.
The level number on the button may not match the level number you see in the mini-game start window.