Super Robot Wars/OG2/Secrets

Secret Mecha

Unit	Requirements
Wild Wurger L	- Arado must shoot down 4 or more Gespenst MK-II M's during scenario 19, before moving next to Seolla. - Arado must have at least 50 kills by the end of scenario 26. - If you've met the required conditions, then Mai will sortie in it during scenario 27. - Mai must shoot down 5 of the initial enemy units before player reinforcements arrive. - You'll get to keep Wild Wurger L after the scenario is finished.
Ashsaber	- In scenario 10 on the Earth route, or scenario 13 on the Moon route, Echidna must be shot down, or forced to retreat. Lamia must then move to the square that Echidna was on right before she retreated. Note that you'll recieve no indication if you did this step correctly or not. - Lamia must have 2, and only 2, battle encounters with Axel during scenario 19. - Lamia must have at least 55 kills by the end of scenario 24. - If you've fulfilled the requirements, then Lamia will sortie in it during scenario 28.
Vaisaga	- Note: Can only be done on a second playthrough. - In scenario 10 on the Earth route, or scenario 13 on the Moon route, Echidna must be shot down, or forced to retreat. Lamia must then move to the square that Echidna was on right before she retreated. Note that you'll recieve no indication if you did this step correctly or not. - Lamia must have 1, and only 1, battle encounter with Axel during scenario 19. - Lamia must have at least 55 kills by the end of scenario 24. - If you've fulfilled the requirements, then Lamia will sortie in it during scenario 28.
Huckebein MK-III R	- Ratsel must gain 15 more kills (in addition to what he starts out with) during scenarios 17 and 18. - You must obtain the Battle Mastery in scenario 30. - Bullet, Kusuha, Ryoto, Rio, Tasuku, and Leona's combined level total must equal 185 or higher by the end of scenario 33. - If the conditions have been fulfilled, then Ratsel's Huckebein MK-III Trombe will become the MK-III R. - Note: You should only fulfill the requirements for this secret if you want to use the Gunner and the Boxer at the same time. The ability to use Gunner and Boxer parts is the only advantage that the MK-III R has over the MK-III Trombe.
Gespenst MK-II S	- Kai must have at least 55 kills, and must be level 33 or higher by the end of scenario 33.

Secret Weapons

Weapon	Requirements
Graviton Cannon	During scenario 6, Viletta must defeat all of the enemy units by herself, with the exception of Yuuki, Carla, and Seolla. It'll come equipped on Viletta's Gespenst MK-II R during scenario 15.
Shishioh Blade and G-Impact Stake	During scenario 15, Silbelwind, Drukin, and Graterkin must be defeated. (Note: Graterkin MUST be defeated last in order to obtain these weapons. The order of the other two does not matter.)
Boost Hammer	During scenario 16, Arado must destroy all of the initial enemies (Gunsects) on his own within 4 turns. It will be obtained after the scenario is completed.
Shishioh Blade	Bullet must have at least 45 kills, and be level 18 or higher by the end of scenario 14. It will be obtained before scenario 18 begins.
Stealth Wing	Carla must be shot down at least once before scenario 31. It will then come equipped on her Randgrith later. Alternatively, it's unlocked automatically if the game is on Easy difficulty at scenario 32. For a fresh playthrough, it is recommended to shoot her unit down during Stage 8 with Grungust's Ankensatsu boosted with Kai's Valor SC, plus a Support Attack from another unit (preferrably Angleg's Phantom Phoenix).
Neo Chakram Shooter and G-Impact Stake	During scenario 30, Dygenguard must not defeat any enemies. The weapons will be obtained after you decide which route to take during the following split.

Secret Parts

Parts	Requirements
Steel Soul, Hero's Mark, and Custom CPU	During scenario 15, Silbelwind, Drukin, and Graterkin must be defeated. (Note: Graterkin MUST be defeated last in order to obtain these parts. The order of the other two does not matter.)
2nd Steel Soul and 2nd Hero's Mark	Finish the game once, then on subsequent playthroughs you will gain these items automatically at the end of scenario 33.

Misc. Secrets

Secret	Requirements
EX-Hard mode	Obtained after finishing the game once and loading your save again. In this mode, PP and money are carried over, weapons cannot be upgraded, all of the pilot stats and skills cost double of what they do normally, the difficulty is on hard regardless of how many Battle Masteries you've obtained, and all enemy units are stronger than normal.
Special mode	Obtained after finishing EX-Hard once and loading your save again. In this mode, PP and money are carried over, all units can have ten levels of upgrades for all stats, and you obtain one of every weapon and part after scenario 1.
Sound Select	After finishing the game once, go into the system menu and press down, up, left, right, L, and R. You'll then be able to listen to all of the BGMs that are in the game.

Timeline

Note: Vaisaga cannot be obtained on the first playthrough.

Scenario	Requirements
3	- In any map from now until scenario 31, Carla must be shot down (by a player unit, not in a cutscene) at least once. (Stealth Wing, method A)
6	- Viletta must defeat all of the enemy units by herself, with the exception of Yuuki, Carla, and Seolla. It'll come equipped on Viletta's Gespenst MK-II R during scenario 15. (Graviton Cannon)
10 (Earth Route), OR 13 (Moon Route)	- Echidna must be shot down, or forced to retreat. Lamia must then move to the square that Echidna was on right before she retreated. Note that you'll recieve no indication if you did this step correctly or not. (Ash Saber/Vaisaga, part 1)
14	- Bullet must have at least 45 kills, and be level 18 or higher by the end of this scenario. It will be obtained before scenario 18 begins. (Shishioh Blade)
15	- During scenario 15, Silbelwind, Drukin, and Graterkin must be defeated. (Note: Graterkin MUST be defeated last. The order of the other two does not matter.) (Shishioh Blade, G-Impact Stake, Steel Soul, Hero's Mark, and Custom CPU)
16	- Arado must destroy all of the initial enemies (Gunsects) on his own within 4 turns. (Boost Hammer)
18	- Ratsel must have at least 35 kills by the end of this scenario. (Huckebein MK-III R, part 1)
19	- Arado must shoot down 4 or more Gespenst MK-II M's, before moving next to Seolla. (Wild Wurger L, part 1) - Lamia must have 2, and only 2, battle encounters with Axel. (Ashsaber, part 2) - Lamia must have 1, and only 1, battle encounter with Axel. (Vaisaga, part 2)
24	- Lamia must have at least 55 kills by the end this scenario. Lamia will sortie in it during scenario 28. (Ashsaber/Vaisaga, part 3)
26	- Arado must have at least 50 kills by the end of this scenario. (Wild Wurger L, part 2)
27	- If Mai sortied in the Wild Wurger L, have her shoot down 5 initial enemy units before player reinforcements arrive. (Wild Wurger L, part 3)
30	- Obtain the Battle Mastery. (Huckebein MK-III R, part 2) - After Dygenguard sorties, it must not defeat any enemies for the rest of the map. (Neo Chakram Shooter and G-Impact Stake, received after scenario 33)
32	- Unlocked automatically if the game is on Easy difficulty going into this scenario. (Stealth Wing, method B)
33	- Bullet, Kusuha, Ryoto, Rio, Tasuku, and Leona's combined level total must equal 185 or higher by the end of this scenario. (Huckebein MK-III R, part 3) - Kai must have at least 55 kills, and must be level 33 or higher by the end of this scenario. (Gespenst MK-II S) - On subsequent playthroughs you will gain these items automatically at the end of this scenario. (2nd Steel Soul and 2nd Hero's Mark)