Unlock level

Hi guys! help me how to make? There are 2 Actor, when you click on the 1st level of the actor opens and when you click on the 2nd actor also offer level. How to make a Level 2 opens only after winning the first.
In the first screenshot blueprints game state of victories.

In the second screenshot blueprints - how to open level.

can you simple create a boolean variable? When you finish the first map you set on this variable…then with a branch you will enable the second stage