Advance Wars 2 Cheats (GameBoy Advance)

Successfully complete all the Blue Moon campaign levels to unlock Olaf at the store.

Buy Grit or Olaf at the store.

The map to the secret lab level is in the unoccupied building across from Lash's
headquarters in the Toybox level. Note: You must capture the city in order to get
the map.

In the inking Feeling level, the secret map is found in the city in the southern-most city
on the Western Isle. Note: You must capture the city in order to get the map.

Find one of the Black Hole Army maps. Finish the missions that the map gives you. You will
be able to build Neo-tanks, with only that country. This is also helpful for future
missions in which you can use COs from other nations.

On the final mission, you are prompted to chose an Orange Star, Blue Moon, then Green
Earth CO. If you wish to use a Yellow Comet CO, press Up or Down until you get to it at
the CO select menu.

In campaign mode, during the fog of war your enemy can always see you, even if you are
outside the visual range of all enemy units. For example, an enemy rocket is on plain
four squares left of your recon that is also on plain. The rocket can still fire on you,
even though it should not be able to see you. An exception is when your unit is in a
forest and there are no enemy units beside you.

Successfully complete campaign mode with an average "A" rank. Alternately, get an average
of an "S" rank on either normal campaign or hard campaign mode.

Successfully complete all the Black Hole campaign levels to unlock Lash at the store.

In the Flak Attack level, capture the city that is located about two squares above your
headquarters.

Here's how to get all of the COs in the game:

  Adder - beat any Campaign Mode
  Colin - recruit Grit or Olaf
  Drake - beat the Green Earth Campaign
  Eagle - beat the Green Earth Campaign
  Grit - beat the Blue Moon Campaign
  Hachi - beat any campaign on Hard Mode
  Hawke - beat any Campaign Mode
  Jess - beat Drake or Eagle
  Kanbei - beat the Yellow Comet Campaign
  Lash - beat any Campaign Mode
  Nell - get an A rank in Campaign mode
  Olaf - beat the Blue Moon Campaign
  Sensei - recruit Kanbei or Sonja
  Sonja - beat the Yellow Comet Campaign 
  Sturm - get an A rank in Campaign mode

To get the Neotanks, you have to capture a specific city on each map, then complete a
special mission.  The cities you need to capture are:

  Andy's Time Mission: Capture the city north of your base to unlock the Orange Star.

  Toy Box Mission: Capture the island city in the far southwest corner of the map to get
the Blue Moon.

  Show Stopper Mission: Capture the city in the far southwest corner to get the Yellow
Comet.

  Sinking Feeling Mission: Capture the southern island city to get the Green Earth.

Buy Kanbei or Sonja at the store.

Successfully complete all the Black Hole campaign levels to unlock Hawke at the store.

Successfully complete all the campaign levels to unlock Nell at the store.

Successfully complete all the Yellow Comet campaign levels to unlock Sonja at the store.

Successfully complete all the Green Earth campaign levels to unlock Eagle at the store.

Successfully complete all the Green Earth campaign levels to unlock Drake at the store.

Buy Drake or Eagle at the store.

Successfully complete all the hard mode campaign levels to unlock Hachi at the store.
Alternately, buy everything in his store.

Successfully complete all the Yellow Comet campaign levels to unlock Kanbei at the store.

Successfully complete all the Blue Moon campaign levels to unlock Grit at the store.

Unlock Olaf, buy his color edit, and select #8.

Successfully complete campaign mode with an "S" rank on either normal campaign or hard
campaign mode to unlock the Sound Test at the store.

Successfully complete all the Black Hole campaign levels to unlock Adder at the store.