A free program for Android, by Okitoo Networks.

This hacking simulator is a free and very fun game for the whole family to play on their phones and tablets, where you can hack into other players and corporations to steal and decrypt secret files, or join a guild and conspire to gain access to another guild data-centers main server and destroy it by planting DDoS bots into other players!

There are a lot of levels, where you have to get the highest score to move on to the next level. The goal is to get as high a score as possible. You get points for everything you do.