Oh... Ok then, I like the volcanoes... but how would they work? Would the lava melt through everything?
Well after the eruption there would be a layer of lava on the bottom, and every 10 seconds you spend in the stage the lava rises.
And as for the volcano thingy you blokes are talking about, I'll just change it to this:
It should always happen in the level before the final boss, and at the time where the ghost should appear lava would start rising(the volcano is slowly erupting), and every 10 seconds the lava would rise 1 row.