It is a nice game. Ads (that also force you to head to the play store) after each mission gets really tiring and annoying. The money earned is really insufficient to buy new weapons and upgrade. Looks like you really have to use real money for this game, and I won't do that. However, the user interface is great. Still a good game. Also, I've been buying weapons with the in-game currency, but the money gets taken away but the weapon isn't added to my purchased weapons list.