In the virtual world, it is so customary, if there is a lock, it will necessarily try to pick up all sorts of enemies. It can be like an army of an aggressive neighbor, and a cloud of monsters from an evil sorcerer. In the case of Hold position - it's a team of hodgepodge of monsters and soldiers. They will begin the attack immediately, moving left and right, continuously firing and trying to get to the fortress walls to punch them and break into. Above the lock is a scale - this is the standard of living. If it decreases to zero, the construction falls, and you lose. There are three elements on the bottom panel, which can be constantly improved as finance becomes available.