The series' gameplay has evolved over the years, from the still cameras of the original series to the more action-based style of Resident Evil 4-6, to the first-person fear introduced in Resident Evil 7: Biohazard. It tested players' nerves with its zombies, BOWs, mutants, and other monstrosities, and tested their brains with its puzzles. But some of their games have been better than others, with these being the best of the bunch.