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The Showdown Effect is 50% off as the Steam daily deal for 5/7/13.
The Showdown Effect = $4.99 / £3.99 / €4.99
The Showdown Effect Digital Deluxe = $9.99 / £7.49 / €9.99
The Showdown Effect Standard 4-Pack = $14.99 / £11.99 / €14.99
The Showdown Effect Digital Deluxe 4-Pack = $14.99 / £22.49 / €29.99