On top of the profits you get from your commercial structures level ups, you can earn keys and other rewards by finishing quests. There are Daily Quests as well as milestones that you can accomplish in City Island 5 and in some cases, you can easily earn them enough just by playing regularly.
although, What is the fastest way to level up in City Island 5?
City Island 5
- Look at your rewards (blue icon) and check which are easiest to complete. …
- Buy extra warehouse space. …
- Speed up the building/upgradig/demolishing process. …
- Build a building that delivers high XP (for example the hospital). …
- Build plazas.
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