Smoke

Smoke is a small and quick graphical effect in Smash Hit that appears after an Explosive Ball has hit an object, or when Glass Cannons fire. A boss also emits smoke from its cannon when it's defeated. The Explosive Ball will also emit smoke when flying, and the smoke may linger for a while, especially in the case of Glass Cannons and bosses. When lasers break, they may also emit some smoke. In older versions, collecting a Power Up would generate smoke, instead of a flash.