You Do Need power plug adapter while traveling from Sudan to Palau.

Here is Why You Need An Adapter

The outlet and plug type used in Palau are A and B and in Sudan are C and D. This is how they look like.

Sudan

In Sudan, outlets of type C and D are in use.

Type C

Type D

Palau

In Palau, outlets of type A and B are in use.

Type A

Type B