Sony expands its Instant Game Collection this week with Thomas Was Alone and Unit 13, which will be released as free downloads for PlayStation Plus subscribers starting tomorrow.

Mike Bithell's Thomas Was Alone, available for both the PlayStation 3 and PS Vita, takes a gang of quadrilateral shapes through a series of puzzle-platforming levels bridged by clever narration. The PlayStation Vita-exclusive Unit 13 serves up tactical third-person shooter action, debuting in 2012 as SOCOM series developer Zipper Interactive's swan song.

Both games will be released as free downloads for Plus members after the PlayStation Store updates tomorrow evening. Thomas Was Alone is a Cross-Buy release, and Plus subscribers will receive both the PS3 and Vita versions with tomorrow's update.

[Image: Mike Bithell]
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Thomas Was Alone (PSN)

This article was originally published on Joystiq.