Portals can only be placed on certain surfaces, and portal shooting can be blocked via electric barriers. Featuring the same mechanics as the original game, the player solves puzzles with a prototype 'portal gun', which allows them to create a connected opening on two different flat planes. Like Portal 2, Portal Stories: Mel is a puzzle-platform game played from the first-person perspective as the player character Mel. Reviewers largely praised the mod's visual design and ambition, though they criticized its difficulty later updates added a 'story mode' that made the puzzles easier. Set in the Portal universe, players control the test subject Mel, who has to escape an underground facility after she spends decades in artificial hibernation. Like the official Portal games, it is a puzzle-platform game that involves placing interconnected 'portals' to solve puzzles. The mod was released on June 25, 2015, for Microsoft Windows, and OS X systems, available freely to users who own Portal 2 on Steam. Portal Stories: Mel is a single-player mod for Portal 2 developed by Prism Studios.

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