Copied from the developer's comment on Reddit.

= = = = = = = =

Let's have a look at the code:

else if(tQuarry[w][h].getWeight() * tQuarry[w][h].getDistanceFallen() > PlayerHardness || tQuarry[w][h].getID().equals("Stone") == true)

This line basically determines if something is going to squish the crap out of the player.

PlayerHardness is set to 10 earlier in the program, and objects have different weights.

Stones have Weight 10 (though they instakill anyway)

Unsunnium has weight 2

Ninthronium has weight 10

Powercells have weight 10

Dropbears have weight 10,000

So, from this, we can see that Ninthronium & Batteries will kill you if they drop 2 squares or more. Unsunnium takes about 6 squares to kill you, while Dropbears will remove you from existence at any distance.

Thanks for asking this one - I haven't looked at that particular bit of code in about... 6 months? So it was good to hunt it down for laughs.