Prototype

The experience points awarded for each Orb picked up is based on how many Orbs have already been collected.

Hint Orbs
1: 5,000 each
10: 7,500 each (and 10,000 bonus)
15: 12,500 each (and 25,000 bonus)
35: 15,000 each (and 50,000 bonus)

Landmark Orbs
1: 2,600 each
10: 5,000 each (and 10,000 bonus)
25: 9,750 each (and 25,000 bonus)
100: 15,000 each (and 50,000 bonus)
125: 17, 250 each (and 60,000 bonus)
150: 20,000 each (and 70,000 bonus)

Squawking crows usually circle the Infected water towers, making them easier to find.

Unlock the "Rolling Thunder" Kill Event that occurs between the East Village and the Lower East Side. You can find a Thermobaric Tank next to that event. Get into it to activate the event, then quickly exit before the event actually starts. If done correctly you will have a free tank. The tank will disappear if you leave the tank or use it to destroy a Hive or Base. However it can be obtained again where it was found.

Successfully complete the game under the Normal difficulty setting.

To do this trick you will need the ability to Jump Kick so that you can fly towards the first helicopter of The Strike team. You can also use the Whipfist's Grab upgrade to latch onto an enemy helicopter. Double Jump can also be useful. To start, jump up and Jump Kick or use the Whipfist Grab to latch onto the first helicopter. Do the button event to kill the pilots. Fly up as high as possible and look for the next target. Make sure to use the Lock On ability. Jump out of the current helicopter and Jump Kick towards the next helicopter. You can keep doing this as long as there are helicopters. If you fall, quickly use the Whipfist Grab. Note: This can be very challenging but if done successfully you can attack numerous helicopters without ever touching the ground.

Successfully complete Story mode. You can now replay Story mode with all powers and upgrades previously unlocked.

Earn a "Gold" rank in all events. Note: This may also unlock some Radical events.

After unlocking the New Game Plus option for Easy Mode or Normal Mode, it is possible to start a new game plus on a difficulty setting for which it has not been unlocked. To do this, under New Game, select Easy plus or Normal plus, whichever is applicable. Instead of saving as prompted however, press circle to back out of your selection, and then select a difficulty for which the New Game plus has not been unlocked. Save the data when prompted to begin the game. You will begin the game with New Game plus status, without having unlocked it for the corresponding difficulty setting.

First you must unlock the Kill Event called "Rolling Thunder," which appears between the East Village and the Lower East Side (one block from the East coast). Right next to the Event is a Thermobaric Tank. Jumping into it will activate the Event, but you can back out of it before the Event begins. Do this correctly and you'll have a free tank. Note: If you exit the tank it or use it to destroy a Hive or Base it will vanish. You can grab it again at the Event point.