Wall Traps defend your city against attackers. You build traps in your Wall to improve your city’s defences. Every level you upgrade your wall will increase your total Wall’s trap capacity. Wall trap research not only unlocks new traps, but also increases your traps attack and defence.
Strategic Wall Trap research allows you to unlock all of the Strategic Wall Traps and increase your strategic traps attack and defense statistics. Strategic Wall traps are specialised versions of their standard counterparts. They are very strong against specific troop types, but weak against others.