Now, here's a guide on how to complete an offer. First of all, there are three kinds of an offer: a free survey, download offer and mobile offer. Some countries have mobile offers only while some have all three.
First, for free surveys. To complete them, you will need to enter some personal information. This depends on the survey. Some might ask for your name, email and birthday. Simply enter your real information there and click continue/submit. Note: Enter truthful information or else the offer would never be completed and the game will not be unlocked.
Second, for download surveys. From the name itself, you will need to download something, it can be a game or any software. Once downloaded, you may also be asked to install it.
Last, for mobile surveys. To complete them, you will need to enter your mobile number. Simply enter your number and follow the instructions of the offer. If it sends you a PIN code, you may need to type that back to the offer. Your phone will be charged for this, read the offer on how much is the cost. Note: You need to have enough balance in your mobile in order to complete mobile offers.