Better than random hightech canisters mysteriously lying around in the woods and outside the shopping mall, would be to give the player a real incentive to move efficiently.
Bomb missions already do this. Terror missions carry some pressure too, IF the player wants a good score on the civilians.
Why can't landed UFOs simply take off after a couple dozen turns?
Crashed UFOs could be on fire and gradually be consumed by flames.
Alien abduction missions should logically have UFOs. Abductors could take off once enough victims have been carried on board.
Bomb missions already do this. Terror missions carry some pressure too, IF the player wants a good score on the civilians.
Why can't landed UFOs simply take off after a couple dozen turns?
Crashed UFOs could be on fire and gradually be consumed by flames.
Alien abduction missions should logically have UFOs. Abductors could take off once enough victims have been carried on board.