In this series we are using Blueprint in Unreal Engine 4 to create a simple, but flexible, target range system. This could be expanded to create the "killhouse" style levels that you get in some FPS's.
The series is aimed at the beginnner, all steps are explained in detail.
In this final part we add a door that opens when targets are destroyed, and finally add a simple timing Blueprint..
...
https://www.youtube.com/watch?v=rehZrWB0V-s