Great game for those into City builders and 4x type of games like Civ.
This was the cheapest I found was looking something to play during iso.
Note Anno is only available through Uplay or Epic Games, this game provides you an activation onto UPlay (Ubisoft's version of Steam)
https://www.metacritic.com/game/pc/anno-1800
Happy Gaming!
Or pay $9.95 for the first month of UPlay+ and finish the game in that time.