As well as caching, we make really heavy use of Redis for Leaderboards for our games. The sorted sets are perfect for storing score along with the userid. Scann

As well as caching, we make really heavy use of Redis for Leaderboards for our games. The sorted sets are perfect for storing score along with the userid. Scanning the leaderboard, finding neighboring scores, etc are all really fast operations. This could probably be done with a number of other storage system but we already used Redis and we've never had a problem.