i found the ultra rare units cool but for whatever reason after i got my third the only ones that would ever show up where defense walls i received 8 in a row
i love the game owever i have to say once i got to the zac simulator i almost felt like crying because i ran out of shinny weapons to play with but overall i think this is a refreshing and addicting revamp to tower defense
There is a limit to how many rare units of a certain type you can find