Final Fantasy XV offer review

Very generous offer. It requires some initial time investment, but if you follow tips it can be done rather quickly. They also usually run additional events that allow you to super-speed your development and thus complete offer even faster.

Terms: Install, Open & Reach Citadel level 10.
Reward: $7 - $18
Platforms: Android and iOS
Offerwalls availability: AdGate, OfferToro, Adscend and others
Time investment: 1-2 days
First time investment: 5 days
Rating: A (Do it right away)

Tips:

• Each citadel level have some other buildings requirements. Fulfill the requirements and upgrade it to next level. 
• Most of the time you wait until you have enough resources to upgrade next building (stones and metal). 
• Build 1 farm, 1 energy collector and all other resources shall be mines and quarries. 
• Attack lvl 1 monsters when hero energy is full - monsters drop random resources, if you are lucky it will be stones and metal.
• Complete hero quests (they are refreshed every 6 hours) - they give some amount of all resources.
• If you get gold from drop, events or  - buy additional resources using gold. Also you get lot of gold if you register account from settings using any temp email address.
• After you start building Citadel level 10 - offer will credit.

Additional notes:

This offer appears much less frequently now. On Swagbucks there is an offer for 1000SB that requires you to enter an email and click link from it - it works, but takes several weeks to post.

Sometimes there is another offer to get 100k power, it requires a little different strategy.

Aim to build Citadel level 10, Library level 10 (you may want to research monster level 2 and siege troop level 2), Wall level 10 and 3-4 Farms level 10. Concentrate on building siege troops and wall traps up to the limit. Also try to increase other buildings as much as possible and get as much possible hero level. It will help you get to desired power level within a week.