I just signed up for Carnival's Fun Match program, and got a comp offer based on my Mlife casino tier/play: a balcony stateroom with $50 free play and free drinks while actively playing in the casino, all for $200 (which is reimbursed in the form of onboard credit), plus taxes and port fees. I'm considering taking Carnival up on this offer, as I had never cruised with them before. I just have a few questions about this:

1. Is the free play good for just the slots, or would I be able to use it at the tables as well?

2. Would I be able to use any of the $200 OBC on casino play?

3. Would I be able to use the OBC to pre-purchase items for the cruise on the Carnival website (such as specialty dining)? If not, would I have to pay via credit card online, or would those expenses go onto the onboard account during the cruise (to be deducted from OBC)?

4. How are the blackjack table minimums on Liberty/about what percentage of those tables pay 3-2 for a natural blackjack?

Thanks in advance!