Yes, the eye tracker is included and will be sent by postal mail together with the laptop.
The attention network of the brain closely works together with the network that controls eye movements. Then by training eye movement control, one trains attention as well. This is beneficial for patients with ADHD but also other mental disorder that show poor attention skill and insufficient eye movement control.
The game forces the patient to focus, follow or avoid to look at objects that appear on the screen. Direct feedback of the actual eye movement helps to control the eye movement and thereby training attention.