Impact provides some basic game collision detection and response for entities. This is often sufficient for Jump'n'Run or RPG games, but sometimes you need some more accurate and realistic physics. This is where Box2D comes in.
in Plugins, Entities Make your entities mouse sensitive to the nearest pixel
Make your entities mouse sensitive to the nearest pixel
With this plugin you can make your entites mouse sensitive to the nearest pixel. The plugin doesn't trigger if the mouse is over the entity sprite like normally. But it looks if the mouse is over an transparent or visible pixel also. With this you can listen to all common mouse events to interact with your entities.