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Japan:|

Difficulty: 1/5
Record: 200/500 m 50.000 pts
Bonus Mileage: 400 m
Points needed for a 1-Up: 100.000

The second level is a bit longer than the Driller Lab, but not really harder. 
Gravity is still low as well as the air consumption, X-blocks are relatively 
scarce and air tanks are both numerous and reachable by easy means so you can 
easily try to get a badge and the Perfect Air Bonus at the same time.

1-100m  : Four colours
          This plays just like the first one hundred meters in the Driller 
          Lab which means that you should just keep on moving and grab all 
          air capsules on the way down. A few of them might demand some X-
          block chain-reactions but nothing too mind-boggling.
101-200m: Three colours
          Three-colour-sections are a lot easier than four-colour-section but  
          of course also harder than two-colour-section except for the low 
          chance of uncontrollable chain-reactions.
          Actually this is just a step-down in terms of difficulty from the 
          first section and nothing more or less. You'll be able to drill 
          through a lot of big blocks and every oxygen tank is as easy to nab 
          as in the first section so go for all of them.
201-300m: Two colours
          Just the same as the centre section of the Driller Lab; just enjoy 
          this part.
301-400m: Four colours
          Although gravity has clearly risen, only getting through this stage 
          is rather easy as you are able to drill down long ways before 
          reaching an X-block but getting every air tank is harder than in 
          any prior stage. Every item is surrounded by X-Blocks so you either 
          have to destroy them via chain-reactions or find (or create) a gap 
          in between them.
          Since air consumption still is pretty low you better not hasten       
          through here too much but take your time and think strategically.
401-500m: Four colours
          Pretty much the same as the previous hundred meters but now you'll 
          encounter the first air capsules lying in X-block-dead-ends so 
          prior to picking up one, better check if you can move on afterwards 
          without having to waste 20 percentage points of air.