Hidden Map
Hold [L] and [R] when selecting Map Design mode to display a map with terrain that spells \"Advance Wars\".

Also, there are two groups of buildings at the bottom of the hidden map. 
The orange buildings make the orange star symbol, while the blue buildings make the blue moon symbol.

Bonus COs
Adder (costs 1,000 points): Win mission 26 in normal campaign mode.
Candle (costs 3,500 points): Win mission 26 in normal campaign mode.
Chakka (costs 3,500 points): Win mission 26 in normal campaign mode.
Flak (costs 1,000 points): Win mission 26 in normal campaign mode.
Grimm (costs 1,000 points): Win mission 20 in normal campaign mode.
Hachi (costs 2,000 points): Complete normal campaign mode with an overall \"S\" rank.
Hawke (costs 1,000 points): Win mission 26 in normal campaign mode.
Javier (costs 1,000 points): Win mission 20 in normal campaign mode.
Juggler (costs 3,000 points): Win mission 26 in normal campaign mode.
Kindle (costs 3,500 points): Win mission 26 in normal campaign mode.
Koal (costs 3,500 points): Win mission 26 in normal campaign mode.
Lash (costs 1,000 points): Win mission 26 in normal campaign mode.
Sturm (costs 5,000 points): Unlock all other COs, their color edits, and earn all 300 medals.
Nell (costs 2,000 points): Complete normal campaign mode with an overall \"A\" rank.
Sasha (costs 600 points): Win mission 20 in normal campaign mode .
Von Bolt: Complete hard campaign mode.
Zipo (costs 3,000 points): Win mission 26 in normal campaign mode.

Battle Map Shop Bonuses
Insert either Advance Wars or Advance Wars 2: Black Hole Rising into the Game Boy Advance slot 
on your Nintendo DS before powering up. Once in the game, go to Hachi at the map shop. 
He will comment on your taste in games and will have a new wallpaper that will cost 1 credit, 
which may not otherwise be available in the game:

Advance Warpaper (costs 1 point): Have the Game Boy Advance game Advance Wars inserted.
Advance Warpaper 2 (costs 1 point): Have the Game Boy Advance game Advance Wars 2 inserted.
Hachi\'s Land map (costs 1 point): Have the Game Boy Advance game Advance Wars inserted.
Lash\'s Land map (costs 1 point): Have the Game Boy Advance game Advance Wars 2 inserted.
Nell\'s Land map (costs 1 point): Have the Game Boy Advance game Advance Wars inserted.
Strum\'s Land map (costs 1 point): Have the Game Boy Advance game Advance Wars 2 inserted.

Hard Combat Mode
Successfully complete combat mode.

Easy Points
Mission four (Reclaim The Skies) in campaign mode takes only about a minute to complete, 
and every time will result in 300 points. 
After the mission, just save the game in a different file and quit campaign mode. 
Load the file for on mission four and repeat. 
Note: Make sure to save in the file marked mission five after completing mission four. 
Mission four gives you points towards Rachael\'s CO ranking. 
Mission two is also quick, and is good for getting points for Jake towards his CO ranking.

Gallery Images
Complete the indicated task to unlock the corresponding gallery images. 
Note: Images 1 through 28 are already unlocked by default.

29. Rachel\'s Hat - Watch the Mission 9 ending.
30. Toast - Watch the Mission 22 ending.
31. Party 1 - Watch the Mission 22 ending.
32. Party 2 - Watch the Mission 22 ending.
33. Handshake - Watch the Mission 22 ending.
34. Dismissed! - Watch the game\'s ending.
35. Report - Watch the game\'s ending.
36. Promise Hill - Watch the game\'s ending.
37. Flowers - Watch the game\'s ending.
38. Three Villains - Watch the game\'s ending.
39. Original 7 - Select \"Yes - after the last mission.
40. Salute - Select \"No - after the last mission.
41. Drive - Successfully complete campaign mode under the hard difficulty.

Means To An End: Easy win
Choose the CO Sensei, and if possible, equip the skill Invader (Capture+1) and for the secondary front, choose Max. 
At the start of the mission, build four infantries and soon as possible, 
build a B copter and attack the enemy infantry that is capturing buildings at the south. 
The turn after that, build a T Copter and send an infantry south and deploy it after you destroy the enemy infantry. 
Watch out for Ooziums, and capture the Black Hole property so that Von Bolt will only deploy cheap units. 
When your CO Power is available, use it and it deploy infantries with 9 HPS when you have at least two properties south. 
Thanks to the skill Invader, it will take two days to capture a property. 
Capture all the properties south when evading the Oozium. 
As you capture more properties, you can deploy strong units to wipe out the enemy\'s cheaper units. 
Use your Super CO Power to deploy mech all over the place and flood them with mech. 
When the secondary front is won, deploy MegaTanks to destroy the Grand Bolt\'s weak spot. 
Capture the enemy base if you have the chance.

Muck Amok: Easy Experience and Money
If you are at this mission in hard campaign mode, at the beginning save the game in a empty slot. 
Clear the mission by destroying every Oozium on the field quickly. 
For each Oozium you kill in hard mode, you will be rewarded with 40 points. 
If you end the mission without problems, you will have 100 points for Speed, 
Technique and Power and 880 points for killing 22 Ooziums (if you destroy the cannon and the pipes you will have more). 
You will have over 2,000 points (with the hard mode bonus) and you will have enough for two promotions 
for each CO that does that mission. If you make that mission on the other file, 
do not save it so you can repeat it for more points. However, make sure you save it on another mode to save the points you earned.

Sonja: Massive Vision Range
If Sonja is at rank 3 and you have completed the campaign, place the Scout and the Eagle Eye skill. 
This will improve the vision range to 4 (or 5 if CO Power is activated). 
Normally, a recon unit will see nine or ten spaces away. By using the CO Power, 
you can see the entire the map without the fog of war.

Last Time Survival Level
At the \"CO Selection\" screen, choose Kanebi and any other CO. For the last level, charge up both CO tag power for a quick victory. 
As soon as you can buy two troops (preferably infantry), do whatever is needed with your starting units except the black boat 
(which you should move to the shore). The next day, make sure Kanebi is the second CO and use the tag team power. 
Move the boat up to the enemy HQ and unload the troops on the shore. 
You must do this quickly in the first few days before Grimm blocks it off. 
Next, change CO so that Kanebi is in charge. Start to capture the HQ and do what is needed with the other troop. 
The next day Grimm will be unable to damage your troop on the HQ. 
This allows you to finish capturing the remaining part of the HQ, giving you a quick victory for this level. 
This does not work later, as Grimm blocks the shores with tanks and stops you from the unloading of the troops.

Smiling HQ
When your CO (or first CO in Tag battles) is from Orange Star sometimes the lights in the HQ will change into a smiley face.

Glitch: Stealth Unit Graphics
If you see a stealth unit going up, you will see a small line in the corner blinking.

Tank on a River
Go to \"Design Map\". Build a 3 vertical by 5 horizontal rectangle sea. Build a shoal on top of the river. 
Put any ground unit except Infantry, Mech or Oozium on the shoal. Move the pointer three spaces north from the ground unit. 
Build a river, drag it down, and the shoal will be transformed into a river, with the tank on the river.