Tier 4 traps are the most rewarding, powerful and highest levelled Wall Traps. Unlike Tier 3 Traps, Tier 4's are only effective against dealing with a single category of enemy troop, similarly to Tier 1 and Tier 2's. However for their lack of ability to take out multiple troops, the traps sure do make up with it with their very strong Attack, Defence and Health stats. With additional Research and other buffs, Tier 4 troops are able to become extremely more powerful as they are percentage based buffs. Unlocking these traps requires an Academy Lv.21, "Trap Defence Lv.10", as well as all three Tier 3 traps.