UFO2: Extraterrestrials is a turn-based tactical squad-based game that combines real-time global strategy and air combat. The game features destructible terrain and dynamic lighting that creates an immersive environment for the player. The RPG elements of the game are strong, with soldiers' stats improving with experience, and a large number of technologies, weapons, and combat units to develop. The game is set in a 3D world and features a large number of aliens to interrogate.

The game's tactical squad-based system is turn-based and follows a "I-Go-You-Go" format. Players must use strategy and tactics to overcome their enemies and complete their objectives. The game's interactive environments allow players to use the terrain to their advantage, which is especially important in air combat.

Overall, UFO2: Extraterrestrials is a complex and immersive strategy game that will appeal to fans of the genre. The final gameplay design and balance tweaks by the author of the popular original UFO: ET Bman Ease of Use Mod add to the game's appeal, making it more accessible to newcomers while still challenging to veterans.