Talk:Dragon Ball Super: Universe Survival Saga/@comment-35269097-20180511083633

Stage 11 & 12 metal grind tip:

only run on Normal with 5-6 "Universe  Survival Saga" units - which is almost guaranteed for an extra drop

16 sta for twice Normal can get you 3-4 metals, while 15 sta for once Z-Hard only get you 2-3 metal on average.

The only downside for this method is lower rank exp gained from the grind.