Portal 2

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History

(2007-2008) Directed Design Experiments

(December 2008 - 2009) Experimental Era

(2009) Core Hub Era

The Core Hub Era demonstrates Valve's first attempt to create a proper follow-up to Portal after the cancellation of F-STOP. This era is named for its inclusion of a hub world that would have interconnected the game's six testing courses.

Gameplay

The player was able to progress through the testing courses in any order.

Story

The player reactivates GLaDOS and attempts to repair her by retrieving six personality cores.

Characters
  • GLaDOS (Carcass)
  • Mel (early Core Hub Era) / Chell (late Core Hub Era)

(2010) Multi-Core Era

After discarding the nonlinear progression that was being developed during the Core Hub Era, Portal 2 transitioned to a new era known as the Multi-Core Era.

Gameplay

Story

Wheatley is killed off by GLaDOS after her reactivation.

Characters
  • GLaDOS
  • Wheatley
  • Morgan Freeman Sphere

(June 2010 - October 2010) E3 Era

E3 Era

Portal 2 was demonstrated at E3 2010.

Gameplay

Story

Portal 2 did not have a proper ending during this era.

Characters
  • GLaDOS
  • Wheatley
  • Chell

(2011) Retail Era

Retail Era