Heroes III may be played out in single missions, or you may treat yourself to a series of linked campaigns, built to tell the story or the Restoration of Erathia. Queen Catherine returns to Erathia only to find the place razed by a huge battle. Much of Enroth is in chaos, and she takes it upon herself to secure what she can, and put an end to the evil that has claimed much of it. You begin with only one town, and send your heroes out to secure the rest. Individual campaigns are fairly short, but there are quite a few of them.
Missions can be very long and satisfying, and an excellent save feature has been implemented.
It's a good story, and missions are kept interesting. Some mission goals will be to defeat all enemies, others will be to secure a specific artifact or capture a certain town. The missions are interesting and make the story progress nicely. Over the years, the interface of the Heroes series has been polished and improved. It is one of the few games that maintains a high level of detail while remaining easy to learn and use.