Buy Portal
According to COST.games Portal can be purchased at Steam for $9.99.
The lowest price ever for Portal is $0.99.
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Portal review
COST.games gives Portal a score of 92.
The average score based on 27 critics reviews on Metacritic is 90 points.
5,012 users of Metacritic gave Portal an average score of 8.8.
On Steam, 98% of the 144,075 players gave a positive rating.