Easy money
Go to Apple Market and kick the can into the bakery.
The woman behind the counter will give you 1000 Zenny. Enter any
shop and exit. The can will reappear. Repeat this as many times
as needed. Note: This will still work when everyone leaves.
Go to the market just before the main city (the junk store is
found here). At the south entrance/exit, you can find a small
yellow can on the ground next to a garbage pail. Start kicking
it until you put it behind the counter of the larger of the two
bread stores. A "Nice shot! Bonus 1000 Zenny" message
will appear, followed by Remember to recycle your empty cans".
You can exit and re-enter the market and repeat this as many times
as needed.
Play the beast hunter game at the Studio to get 4000 Zenny for
completing grade A. Repeat this as many times as needed.
Once you have destroyed the Bruno robot in Old City, go in the
gate down to the Main Gate. Destroy the fire breathing dog. Collect
the Zenny with the Vacuum Arm. Exit where you entered, and repeat
as many times as needed. Before that though, there are "beehives"
in the Cordon Ruins, where you get the Yellow Refractor. As long
as you do not destroy the "hives" themselves, they unleash
a unlimited number of flying enemies.
Use a high powered gun such as the Shinning Laser in places like
the Underground City, Uptown, and Downtown to get more money than
with the Buster Gun.
To get 51,100 Zenny, talk to Data. Say "I keep losing fights...".
Data will say some things about saving money and give you 100
Zenny. He will then say "Want some more?" Select "No"
to get 1000 more Zenny. If you answered "Yes", he will
say "Don't be greedy". He once again asks "Want
some more?" Select "Yes" this time, an you will
get 1000, 2000, 3000, and so on, up to 10,000 Zenny. When totaled,
you can get 51,100 Zenny, but it can only be done once.
Do the Cop mission where you have to get the "stolen"
money. After you get the trunk, do not take it to the inspector.
Instead, keep it and leave downtown. You will instantly get 200,000
Zenny. Note: Your armor will turn black.
Hard difficulty
Successfully complete the game to unlock the hard difficulty
setting.
Easy difficulty
Successfully complete the game under the hard difficulty
setting to unlock the easy difficulty setting. Alternately, successfully
complete the game with a time less than 3 hours. Note: The Bust
Max will be available at the start of a game in easy mode.
Start with Jet Skates and Buster Max
Successfully complete the game under the hard difficulty
setting with a time less than 8 hours. The Jet Skates and Buster
Max will already be available at the start of the next new game.
You can also start with the Jet Skates and Buster Max when a new
game is started under the easy difficulty setting.