I needed a game to reinforce intervals for my group lessons and for one of my summer camps, so I purchased the game of Sorry and made some new cards to go with it. By just replacing the cards that come with the game with these cards I made, students reinforce their recognition of intervals in both the bass and treble clefs.
Here is a close-up of the cards I made. You can print your own cards off my website here.
It's a fun game and the kids are loving it!