Rating Notes:

Data was collected on Nightstar multiple times for validation. Players of average skill can expect to see an exercise equivalent of a brisk walk. However, on the final data collection, rater was able to play to a very high difficulty, and achieved a top score in the game’s global rating. During this data collection session, rater achieved energy burn comparable to that of a mild Elliptical rating. At higher difficulties, Nightstar requires the player to constantly move from side to side throughout their play space, squatting and ducking to avoid contact with enemies.

In addition to actually having to move to succeed in the higher difficulties (not just lean from side to side), the rater also had to move their arms constantly. Nightstar is a game that if played with enough skill and at the higher difficulties can be reasonable exercise

Quick Facts:

Status: Metabolic Rating: This game was tested by measuring oxygen consumption with
a metabolic cart.
Peak Observed Sustained MET:  6.8 METs
Average Observed METs:  5.37 METs
Est. calories expenditure per min.: We observed an energy expenditure of 5.64 kcals to 7.14 kcals per minute
during our tests. This estimate is based on the assumption that the subject
weighs 60kg. Please see the table below for an estimate of calorie
expenditure for your weight.
Link: https://store.steampowered.com/app/511570/NIGHTSTAR/

Calorie Table: