Explore the rest of the city

Explore the rest of the city was a mission in Ratchet & Clank. After visiting Al's RoboShack and buying a Heli-Pack upgrade for Clank, both he and Ratchet continued exploring Metropolis.

Walkthrough
Leave Al's RoboShack through the rear exit and use your new Heli-Pack's boost jump (crouch with, followed by jumping with ) to climb the nearby cargo. At the top, perform a stretch jump (same controls as a boost jump, except you must both crouch and jump while running forwards) to reach the elevator platform up ahead. At the top you must then use the glide (hold in mid-air) to safely land on the area below and to the left, on which will run into a trio of Blarg commanders. Take the elevator behind them to the top of another tower.

Now you will encounter a small group of Robomutts, a lone Mine Layer and a Spawner that will produce more Robomutts. Regardless, none of these are a real threat and will go down quickly under continuous fire from any available weapon. Go along the bridge and up the escalator to reach a train station, guarded by several more commanders. Take note of a rather large amount of crates hidden behind stacks of cargo on the left before boarding the nearby robot train and automatically transitioning into the mission "Ride the Robot Train".