Letter Quest: Grimm's Journey Remastered

There are 120 normal (yellow) stars to be earned in story mode. Across the 40 stages, each stage has a star for beating it, a star for beating the time trial version, and a star for beating it with an added trait on each enemy. These are all very easy and straightforward as long as you continually buy upgrades as you progress and earn more gems.

I highly recommend earning all three stars on a stage before moving on to the next. This may seem tedious but it'll guarantee you have enough gems to buy more upgrades to make sure you're always ahead of the curve on all future stages, keeping it easy along the way. If you ever find yourself struggling, you can always replay earlier levels over and over to farm gems to buy more upgrades, potions, etc.