Deadly Sky 4.5 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Games, more precisely Arcade. This free program is an intellectual property of Falco Software Company. We recommend checking the downloaded files with any free antivirus.
From the developer:
Attention! Attention!! Attention!!!
Enemy fighters violated intergalactic space and committed treacherous bombing of peaceful settlements!
All our defense forces have been destroyed. BUT! There remains one small fighter with a limited supply of weapons, which belongs to a retired pilot from the Organization for the Control of Intergalactic Borders.
You may want to check out more software, such as Sky Sports, Red Sky or S.T.A.L.K.E.R. Clear Sky, which might be related to Deadly Sky.
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