It's been said that in semi rough seas, a person can throw a gutter ball and have it come back out for a strike. In rough seas the lanes are closed. We have watched people bowling on the Pearl and really having a good time.
I hadn't bowled in about 30 years but my wife and I just did last week on the Pearl.
These are real, regulations bowling lanes with automatic scorers (thank god). They charge $5 per game but it is 2 for 1 on port days. The cost included the shoes and they have plenty of them.
There are four lanes, two on either side of the Bliss Lounge. We did not have to wait for a lane when we went. During the evenings, we noticed that there were quite a few people bowling but not sure how many were waiting. There is a nice seating area on the lanes themselves that is elevated from the lounge floor level and it is easy to observe the games progress on the scoring monitors.
We did not see any problem with the motion of the ship affecting the games but we had a very calm cruise, almost no pitch or roll was felt during the entire cruise.
Bottom line, we had a great time even though my wife beat me 2 games to one.