I know its a standalone expansion but I've never played any of the other Shadow Tactics so I'd be super lost as to what's going on. Like when I got started on the MCU with Guardians of the Galaxy 2. Very confusing experience.

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I, too, have a game on Steam called Clash: Robot Detective. https://store.steampowered.com/app/2222480/Clash_Robot_Detective__Complete_Edition/