i've attached the original level of rollaround, you don't need to download it to possibly answer my question, but it's there anyway. you might find it an interesting level, if you'd like to play it without a hint then read no further and just scroll to the level download. if you'd just like to answer my question (the question necessarily gives away a clue to the solution) then just read on.
ok, the solution i intended involves pushing the grey boulder left into green boulder rolling up to smash the green one in turn starting the (green boulder)generator, however, sometimes the green one smashes the grey one instead leaving the level unsolvable. i also tried having the grey boulder moving down to hit the green one head on, again with unreliable results.
so my question is simple. when creating a level where you need to collide two boulders, is it possible to know which boulder will smash or even if both will smash or is it simply down to chance? any opinions greatly appreciated, thanks.
