Portal 2

Portal 2

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The Lost Tower - Part 1a
 
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The Lost Tower - Part 1a

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Description
Even in the years since the machines have risen up in rebellion, the original rebel AI, GlaDOS, is considered psychotic even by the machines. So why would these two ancient enemies be collaborating? You must discover the secret of the Lost Tower to uncover the plot and stop the machines!
The problem is that security at the facility is very tight. You will need all of your skills and a decent amount of luck to triumph.