The Pinball Hall of Fame is definitely a hidden gem in Las Vegas and worth venturing off the strip for a visit.
It's located in a strip mall just a five minute drive from the strip, near UNLV. I recommend getting directions or using a GPS when heading over, as it is a bit hard to see, especially at night. It's dimly lit with a small sign and is not very big.
This is a fantastic place for arcade and pinball lovers. They have hundreds of machines from many eras, some as old as the 20's and 30's. All can be played for a few quarters. I think that it's pretty amazing that they let you play the older machines.
I am not a huge game fan, but I loved reading the fact cards that were on most of the machines and looking at some of the art work. Some of the older pinball machines are very elaborate and cool. I walked around and took pictures of everything.
The guys who work there are great to talk to, taking time to answer questions. We found out that they have more machines than can be housed in the museum and if you have a specific machine that you would like to play, call them a month in advance and they will try to bring it out of storage. They frequently rotate the games out of storage.
A really fun place and a must-do in Vegas.