What is the minimum payout for the machines? Certain newer games (such as Monopoly) allow you to play more than one scratch ticket at the same time, or give you as a prize the opportunity to play from a different game set. Generally, the bonus rounds are for entertainment purposes only, and your interaction with the machine in these rounds has no impact on the outcome of the ticket that had already been delivered to your player terminal. The most common scenario is that players on the same bank (group) of machines are playing from the same game set.
The virtual scratch tickets are dispensed from a finite 'game set' that delivers tickets randomly to two or more terminals. Am I playing by myself against the player terminal? The quick answer is that they are linked lottery terminals where a central computer delivers a virtual 'scratch ticket' to a player terminal, upon the request of a casino guest.