----------------------------4.1 Mission Driller------------------------------

In Mission Driller you simply try to reach the bottom of a cave as one out of 
seven characters. Every level consists of a certain amount of stages each 
being 100 m long and in order to beat a level you have to finish all stages 
in one go.
The deeper you get the more difficult the oxygen tanks are to get and also 
the quicker you'll use up air.
Beating a level without using any items and without losing a single life will 
earn you a Mr. Driller Badge. Each character gets its own badges providing 
some replay value.
For every mile you go down you get one point that can be spent in the shop 
even if you die or select retry.
Mission Driller is the only game mode where you are able to use Usagi but 
note that he doesn't have any ending dialogues.
As every stage in Mission Driller is randomly generated with only some things 
being determined (like number of different colours, general layout of X-
blocks surrounding the oxygen tanks, etc.) I can't give you a real 
walkthrough with step-by-step solutions but just more or less specific 
guidelines.