On the final level of the GDI campaign, you'll be able to use Boyle's Liquid Tiberium Bomb. However, the option to use it or not will give a different ending.
Unlockable How to Unlock The "Bad" Ending Use Boyle's Liquid Tiberium Bomb The "Good" Ending Don't use Boyle's Liquid Tiberium Bomb
Contributed By: DanOmega.
Play as NOD in Skirmish mode of demo
At the skirmish options menu, hold N and click you army to make NOD as selectable option.
To switch back, hold G and click your army to make GDI selectable again.
This works with the computer army as well.
Contributed By: The_Approved.
Play as the Scrin
To play the secret Scrin campaign, finish both the GDI and Nod campaigns. This will unlock the Scrin campaign of four missions.
Contributed By: Grawl.
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Command & Conquer 3: Tiberium Wars Resources