Unbelievable “Citadel” shows why K’Nex is the king of construction toys [video]

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We know, we know, Legos can do a lot of things these days, but K’Nex has been doing them for longer. Case in point? This unbelievable creation entitled “The Citadel,” which took YouTube user Shadowman three years to build, a twisting, turning adventure any ball would envy.