In Mobile Strike your walls provide additional protection against attacks, by housing traps that can kill attacking troops.
Upgrading your walls increases their capacity, allowing you to store more traps. Once your walls are at level 21 you will be able to store 125,000 traps and will also receive a bonus to trap attack of 10%.
When your base is attacked, your traps are added to your defending troops when calculating whether the attacker or defender wins. Having more higher level traps can significantly tip the odds in your favor, killing more of the attackers troops and resulting in less losses for the defender.
You should also spend some time researching trap attack and defense boosts at the research facility, to improve your traps further. New traps can also be unlocked through research.
You are required to level up your walls to the same level as your Headquarters, before you upgrade your HQ. Walls take a huge amount of stone to upgrade in the later levels, more than any other building in Mobile Strike.
The table below has the build cost for each upgrade level from 1 to 21, the build time (before boosts), buildings required and the power rewarded.
Walls Building Requirements
The figures in red have been extrapolated based on previous level data. Whilst the data should be broadly correct, the red numbers may differ slightly from the actual game figures.
We will update with accurate figures (in black) as we can verify them. Please feel free to leave any details you have from Mobile Strike by commenting below and we will update the data accordingly.