Talk:Spy 2.0/@comment-89.168.101.230-20150620130039/@comment-5560390-20150625083935

Full stealth runs aren't necessary, you just need all 3 Data Retrieved(tho I have noticed that I don't get Tower Keys as often when I don't stealth run).

However, doing at least 1 Vault stealthily is recommended due to the fact that when all 3 alarms are triggered you also increase the mission time by turning it into an Exterminate mission.

I, personally, find that doing these stealthily is way easier than just blazing them.