The listing, Cook, Serve, Delicious! [steam key] has ended.
http://store.steampowered.com/app/247020/Cook_Serve_Delicious/
One of the few hardcore restaurant sims in existence, Cook, Serve, Delicious! is a deceptively easy game to learn but incredibly challenging to master as you progress through your career from owning a terrible zero star cafe into a five star world famous restaurant.
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if you have any problems with the activation key please provide screenshots.