ガイラルディア4 is the fourth installment of the Gaia series that takes you on a journey with two to four players, each with their own occupation. The game allows players to switch to advanced professions using specific items, and it is possible for all members to take up advanced professions. The game features conversations between team members that can provide important clues at times.

The system improvements include an upgraded enemy attack selection system that allows for individual selection of enemies within a group, redrawn character images (towns, cities, and many enemy images), and an increased number of background screens during battles compared to its predecessor. In addition, players can walk at double speed in towns and cities (optionally).