I suffered for a long time going through the Blitz Game. It hung and threw it out, then not for gold. Finally it went to gold. The first is to throw the Velcro on the door of the security vehicle from the tow truck and immediately blow it up.
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The second is not to blow up Trevor’s helicopter with a grenade launcher. Only sniper in special ability mode. Third – Destroy the garbage truck to shoot at the tank. Well, if it doesn’t work out, then I saved it after the War on the Law mission. Also a very dumb mission.