A variant of Puzzles & Conquest, but with Zombies.
You may have read my guide to Puzzles & Conquest; this one is a reskin of that game, or maybe the other way around? Anyways, if you have completed the other offer then you won’t any problems here. The only difference is the offer terms require you to reach Headquarters level 22. You still get 60 days time limit so no rush and no need to spend any money.
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Same as before I really want to stress that you need to focus on your Economy heroes. They will reduce your construction resource costs to zero, the same goes for Research. You will get a bonus to your Lords experience gain, Free Time on building speed ups, and big boosts to resource building outputs as well as gathering speed and marching speed.
Got a nice visual display here to help. The heroes you want to focus on are as follows:

Kento (2 Star): Take Kento to level 31 and then stop. Enhance whenever you get enough fragments or whole pieces.

Xavis (2 Star): Take Xavi to level 31 and then stop. Enhance whenever you get enough fragments or whole pieces.

Flint (3 Star): Take Flint to level 31, can even go to 71 if you want extra bonus. Enhance whenever you get enough fragments or whole pieces.

Chester (3 Star): Take Chester to level 31, can even go to 71 if you want extra bonus. Enhance whenever you get enough fragments or whole pieces.

Otto (4 Star): Take Otto all the way to 71. He is also good in the Campaign.

Varvara (4 Star): She is also a good one to take to 71 and get the full bonus. As a 4 star she will fight well in the Campaign.

Anahita (3 Star): She gives Free Speed on timers. The only other way to get this benefit is from getting higher in your VIP rank.
It took me 5 days and all of my resources and speed ups to get to HQ level 15. Sadly I missed out on the extra bonus at the end of the Beginner event. I still got my 5 star hero, but not the extra fragments to enhance him. It takes 2 days to upgrade from 15 to 16, this is with about 14% Construction Speed boost skills. You get the War set of Gear for free initially and can start crafting Gear at Forge level 16.