Solution to 4: Tick List

This is a list of words where the last letter of each word corresponds to the first letter of another word, except the first and last words of the chain. Arranging them in order and taking the first letter of each word spells PORTALEDGE.

Potato
Otter
Rabbit
Tibia
Admiral
Literature
Excluded
Drooling
Genuine
Electricity


PORTALEDGE