Using distance looks nice, but I would like a more dynamic explosion instead of just 2 or 3 levels of strength. For instance, if the explosion happens 1 pixel away from an object, then apply a strength of a 99, if it's 2 pixels away, strength of 98...etc. I guess we could still use the distance expression for it, but the problem is it would be reversed, the closer the explosion happens, the less potent the number would be: 1 pixel away = strength of 1, 2 pixels away = strength of 2.