Well, hello again, I will continue my lemmings thing. This is like when the lemmings explode one by one, by order, and not by "pick one at random". Even if you don't want to make lemmings things this one may be useful for other games or things, of course, if you didn't know how to do it.
Eventsobiously there must be many of the objects that will be destroyed, in this example they will be lemmings. And you also need a counter)
1. Event that causes the lemmings to explode (when this event happens, make sure that no more lemmings will be created):
- Spread value 0 in lemming's value A, set value B of lemming to 1, Set counter to number of lemmings in playfield minus 1
2. Pick objects which alterable value A = value"counter", + Alterable value B of lemming = 1, + Every 00"05
- Destroy lemming, substract 1 from counter.

Well, that's it. You can add explosions, effects and stuff and things.