HiscoreRank is to use the Facebook score system, and it is very limited. The last time I wanted to use It, it only saved ONE variable value for every player, so if you have to save for example "number of plays", "global score", "level score", "number of lives", "number of tries for level", etc... you can't. You only can save in Facebook a number, usually called score.
When I say "database", I mean getting a hosting with database... and programing... PHP. mySQL, etc. I think is too much to explain it here hahaha