Advance Wars: Dual Strike (NDS)

Unlock Sasha
Clear Mission 20 in Normal Campaign with 1000 points.

Adder
Complete Mission 26 in Normal Campaign. At that point you can buy them from Hachi for 1000 points.

Candle
Complete Mission 26 in Normal Campaign. At that point you can buy them from Hachi for 3500 points.

Chakka
Complete Mission 26 in Normal Campaign. At that point you can buy him from Hachi for 3500 points.

Unlock Lash
Clear Mission 26 in Normal Campaign with 1000 points.

Advance Warpaper
Purchase for 1 point when Advance Wars 1 is inserted in your DS.

Advance Warpaper 2
Purchase it for 1 point when Advance Wars 2 is inserted in your DS.

Hachi's Land
Purchase it for 1 point when Advance Wars 1 is inserted in your DS.

Lash's Land Map
Purchase it for 1 point when Advance Wars 2 is inserted in your DS.

Nell's Land
Purchase it for 1 point when Advance Wars 1 is inserted in your DS.

Strum's Land Map
Purchase it for 1 point when Advance Wars 2 is inserted in your DS.

Mission 11
Once you're at Mission 10, capture the city east of your HQ.

Mission 14
Once you're at Mission 13, capture the city in the northeast corner.

Officer's Alternate Costume
When you level up your Commanding officers to rank 10, you may buy an alternate outfit (not a colour edit) from the store.

Alternative Costume
You have to reach Level 10 or higher with a CO. Then go to buy the CO edit from Hachi, and you will unlock the alternative costume in the CO edit menu.

Soundroom
Complete Normal Campaign and buy everything from Hachi.

Character Wallpapers
Once you complete the entire campaign, the wallpapers for the three COs that you used most that campaign will become available. They're selectable from the Display menu.

Oozium
You must comeplete Misson 22. At that point you can purchase Oozium from Battle Maps for 1000 credits. You can then have predeployed Ooziums in your design maps.

Gallery
You must complete the normal campaign once, then purchase it from Hachi for 2000 points.

Von Bolt
Complete the Hard Campaign Mode once. After that you can buy him from Hachi's store.

Hard Combat
Beat Combat mode.

Special Map
Hold L and R while selecting Map Design mode.

Mission 17
You must acquire the map in Mission 16, Snowy Hunters. Check in the southeastern most city, on the small island that has the com tower.

Flak
Complete Mission 26 in Normal Campaign. At that point you can buy him from Hachi for 1000 points.

Grimm
Complete Mission 20 in Normal Campaign. At that point you can buy them from Hachi for 1000 points.

Sasha, Grimm, and Javier
Complete mission 22: Crystal Calamity to unlock COs Sasha, Grimm, and Javier the store.

Brutal Combat Mode
Beat Hard Combat mode once.

Survival Level Up
For an easy way to level up your characters go to the survival mode, select the "turn" option, you will go through the basic course with 11 maps and 99 turns to do this. These maps are way easier to complete than the "money" or "time" maps. Upon completing the basic course you will receive well over 1000 exp. plus a bonus for any turns you have left over. after you do this you will have the option to do the champion course, which is the same 11 maps as many times as you can in 120 turns. Unlike the basic course, if you choose to yield early you will get bonus points for all turns left in the champion course. If you can manage to get to the second wave of maps with about 40 turns left you can earn well over 2000 exp. plus bonus. These maps are a quick and easy way to seriously level up those low ranking CO's.

Rank Increase The Wash-Out Way
To get an easy rank promotion, just start a new campaign and complete the first two levels with Jake. Each time you complete one of those levels, you should receive 300 experience points. Continue starting new games and doing the first two levels until Jake is level 10 or higher. He will now be that same level in any other mode.