The Atom Rewards introductory offer of “See 4 movies, earn a free standard ticket” ended on December 31, 2018. Only members who saw their first qualifying movie on or before December 31, 2018 are eligible to earn a free movie ticket under the Atom Rewards offer.
Your reward status increases with each movie showtime you see, not with each ticket you purchase. For example, if you buy 4 tickets for 1 movie showtime, your reward status will increase by 1. If you see the same movie on another occasion (a different date or showtime) your reward status will increase each time.
A discounted ticket counts towards your free reward ticket, but orders containing only free movie tickets do not.