New answers tagged timer
In each Rock GameObject, just have a script that fires off a StartCoroutine in the Mono Start() method. The method the Coroutine calls can either have a yield WaitForSeconds call or your own custom timer logic before firing off the increase in speed. In regards to adjusting the speed of each object, I'm assuming you have something like a RockController ...
as Instantiate creates a duplicate of a prefab, just attach a script defining your Rock to the rock GameObject and make sure you have in the Start() function a constructor that takes the elapsed time and modify your rock speed consequently.
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