Super Robot Wars/Dark Prison/Secrets

Neo Granzon Code

After beating the game once you can unlock the NEO Granzon for the entire game, as opposed to the last few stages.
To unlock the Neo Granzon on playthrough 2 and beyond you simply enter down, up, left, right, L1, R1 at the title screen. The Granzon's eyes will flash if done right.

During the first half of mission 26, leave a single Liege Gaios unit standing and bring it under 1,000 HP. You'll gain it after the first half is complete.

Stage	Items	Requirement
9	Solar Panel, S Adapter, Soul of Steel, SSP Drink, Graviton Launcher	Defeat all enemies and you will obtain these items after the stage ends.
10, 12	Tesla Drive S, Hyper Jammer, Mark of the Brave	On Stage 10, shoot down Araceli and Sley. On Stage 12, defeat all enemies besides Org, but also make his HP drop below 9,000 in the process. You will obtain these items after the stage ends.
13	50,000 extra credits	Defeat all enemies and you'll obtain the extra money after the stage ends.
14	One-Hit Sure-Kill Knowledge	Defeat all enemies, you will obtain this item after the stage ends.
18	Free Electron Canon	Make sure Gaien has 85 or more kills before stage 18 ends. You will obtain this item after stage 21 ends.
20	MTDM Shooter	Make sure Ahmed has 50 or more kills before stage 20 ends. You will obtain this item after stage 21 ends.
23	G Territory, High Spec CPU	Make sure Yon has 100 or more kills before stage 23 ends. You will obtain these items instead of G Wall and High Spec Radar, which you normally do, after the stage ends.