From the game's website:
Compete against the world! See who's on top with global leaderboards.
75 Achievements and counting! Get awards and earn points for completing challenges.
Share your scores on Facebook and challenge your friends to beat your records.
Upgrade your cannon and ammo to really make your hippo fly! Visit the Jungle Shop to see what's available.
Hippo Blast keeps getting better and better as we add user-requested features to the game.