Hi people!
Ninja Stealth and Ninja Stealth A.I Revolution are on sale until 30/01/2017.
http://store.steampowered.com/app/485450/
http://store.steampowered.com/app/552950
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And if you did not saw yet Ninja Stealth 2, check it out!
http://steamcommunity.com/sharedfiles/filedetails/?id=831467074
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Also, you can buy Ninja Stealth 2 on itch.io!
https://itch.io/s/5931/ninja-stealth-collection