Suddenly, Goblins!

Publisher's blurb: Goblins! Goblins everywhere! When a castle is suddenly overrun by the small cackling mostrosoties the PCs have to discover how they got in and stop any more from causing trouble! Suddenly, Goblins! is an OSR adventure for Swords & Wizardry White Box, although it can be easily adapted for most classic OSR systems. The adventure is designed for a party of any number of adventurers of any race, class and level and can be inserted into your existing campaign quite easily, no matter what world you’re gaming in.