Shadow Complex is a 2.5D action game that combines a fully three-dimensional game world with classic side-scrolling gameplay. Inspired by titles like Super Metroid and Castlevania: Symphony of the Night, players navigate through a vast game world, defeating enemies and gaining new abilities and weapons to progress further. The gameplay features auto-aim mechanics for seamless combat and a leveling system where players earn experience points to enhance their character's skills and attributes.

In addition to the main campaign, players can engage in challenging levels known as "Proving Grounds," where they must complete objectives under specific conditions. Leaderboards track players' progress and achievements, adding a competitive element to the game. With a remastered version announced for multiple platforms, Shadow Complex offers an engaging experience for action-adventure enthusiasts.