Research

When you press this button, you get into the research menu.
Bonuses may be opened and closed.

Open bonuses are lightened the rest are displayed in grey.
If the bonus isn’t opened yet, it displays information on what characteristics it will have at the moment of opening (basic) and the resources required for opening.

For research experience, gold and silver may be required.

The button “Development” is always lightened and available unless the bonus achieved its maximum level. If the maximum level is achieved it changes to the icon “Maximum!”.