Darius Gaiden is a two-dimensional shoot'em up game for Windows, where players control the Silver Hawk spaceship through challenging scrolling stages. The objective is to eliminate enemies while avoiding obstacles using an arsenal of weapons, including forward-firing missiles, aerial bombs, and a unique black hole bomb that creates a vortex to draw in and damage foes. Power-ups dropped by enemies enhance the ship's capabilities, adding depth to the gameplay experience.

In addition to its core mechanics, Darius Gaiden introduces the innovative feature of capturing minibosses. These minibosses can be subdued and will follow the player temporarily, providing assistance until they explode. The game also saw an update with the Darius Gaiden Extra Edition, which offered rearranged levels, auto fire capabilities, and additional weapon power levels, enhancing the overall experience for players seeking more variety and challenge.