Onslaught is a challenging side-scrolling platform hack 'n' slash action game where you play as a highly respected warrior tasked with conquering multiple regions. The objective is divided into three stages: fighting through hordes of fighters to reach the castle, climbing the various sections of the castle, and battling its existing inhabitant.
The gameplay involves navigating through side-scrolling levels while avoiding mines and collecting spells using the function keys. Your physical and mental energy are tracked separately throughout the game, requiring you to keep both high to progress. With its challenging levels and unique spell-casting system, Onslaught promises an exciting experience for fans of action-adventure games.