Use upgrade route to solve one real in-game task.
Use the upgrade route after one full catch loop, then spend your reward on the single tool that makes the next fish feel faster or easier. If the upgrade did not change the next cast, save for a different bottleneck.
- Cast until the fish loop is clear.
- Scale until the fish loop is clear.
- Upgrade until the fish loop is clear.
- Watch weather until the fish loop is clear.