Typically, you'll need to sell something or provide a service in exchange for a PayPal deposit. Some tactics will earn you money faster than others and without much effort.
You could also sell items online to earn additional money faster than you would if playing mobile games in your free time, depending, of course, on the type of items you were selling.
It is important to note that there are a plethora of online scams, especially in the “earn money online” space. You must be diligent when providing personal information and opening emails from unknown users promising free PayPal money.