Try this:
http://imagemodserver.mine.nu/other/...p/leakysim.zip
Set up with no shields or armor, and make the criticals your small platform, and your non-criticals your big platforms.
Simple rules;
- hitpoints lottery
- leftover damage is rerolled
But the gist of it is that the low hitpoint stuff will die pretty much every time it is randomly selected, but the high hitpoint stuff dosen't die until the leftover damage exceeds the high hitpoints. Every time a small one dies, it notches the leftover damage back down... so you have to get many hits in a row that all miss the small items before the leftover damage is enough to kill a big item.
With settings of:
- Crits = Big plats 10 x 1000hp
- Noncrits = Small plats 10x 100hp
- 200 shots x 50 normal damage
The small plats end up totally gone by the time the big plats are down to 2-4 remaining. With plenty of luck mixing up the results.