There are orbs on smokestacks that are an extreme pain to get. These can be obtained easily with the help of a helicopter. Get your agility up to level 5 (for the wingsuit) and make sure the Agency Tower is unlocked. Climb the tower to get to a helicopter. Approach smokestacks slowly and hover just above them (your landing gear may deploy but that’s ok).

This requires 2 people in an online Co-Op match. One person must get a helicopter from the Agency Tower and the other must get a vehicle (Agency Supercar or Cruiser. Both players should meet at the stunt ring. Equip Mag Grenades and stick one to the bottom of the helicopter and one to the roof of the car. Use the helicopter to fly the car through a stunt ring. Be careful: The mag grenades have a timer on them and will eventually explode.

Get a helicopter from the Agency Tower and fly high above the Orb (Low enough that you can survive, unless you have the glide suit and can slow down). Jump out and drop down onto the Orb and it will not start moving until you are very close. If you have enough speed you should fly right into it.

You must have a level 5 in agility before you attempt this. Get a helicopter and fly around Agency Tower until you see a big tube-like thing with no top. Fly over it and get out of your helicopter. Now, use your Wingsuit to fly down the tube. At the bottom is a toilet full of rubber ducks. Oh, and it’s huge.

Begin by recovering the Beacon prototype by claiming the initial two bases, then activate three Absorption units to repair the First Power Network. This will let your agent deploy the Power Station Beacon in the Freak Lair to clear it of enemies.

Go and take over the Cell Tactical Location at the Funland Carnival. Satisfy the kill quota until a support chopper comes to finish the takeover (with the allied soldiers doing the fast-rope). Save (and quit) your game. Boot the game again, reloading that last save, and head back to the Funland Carnival.

One of the "Chuck’s Ducks" game stalls has Quacker Bombs. To keep them for future use, just go to a Agency dropsite with them in hand. Easy!

Remember there is a built-in orb locator for all agents in Crackdown 2. All you do is push UP on the D-Pad.

If you want a really good view of where the Orbs are, pause the game. Then unpause the game and immediately push UP on the D-Pad.

The onscreen map briefly has a very nice aerial view when coming back from the pause screen so the Orb detector will pick up more locations.

Press UP on the D-Pad to briefly get a glimpse at the nearby Orbs on your mini-map in the lower left corner. This "Orb-dar" takes a few seconds to recharge before each use.