----------------------------4.3.1 Walkthrough--------------------------------
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Depth 100 m:
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Difficulty: 1/5
Time to beat: 0'14''00 (Taizo)
              0'15''00 (Susumu)
              0'15''00 (Anna)
              0'17''00 (Puchi)
              0'17''00 (Holinger-Z)
Bonus Miles: Clear Bonus: 100 m

Reverse difficulty: 3/5
Reverse time to beat: 0'09''00 (Taizo)
                      0'10''00 (Susumu)
                      0'10''00 (Anna)
                      0'12''00 (Puchi)
                      0'12''00 (Holinger-Z)
Bonus Miles: Clear Bonus: 300 m

This level basically is self-explaining once you look at it: Simply aim for 
every little hole and pick up every clock. As you always have one of these 
targets on screen the only thing you can improve on is the path between them. 
If possible you should destroy big blocks leading to the next target but most 
often you just have to drill directly towards it.