Packaged EXE files on Mediafire are not scanned by official antivirus vendors. Cybercriminals know that "Castle Crashers" is a high-volume search. They will bundle the game with Trojans, keyloggers, or ransomware. Once you run the "installer," you might be giving hackers access to your Steam account, browser passwords, or personal files.
The search term is popular for three simple reasons:
Mediafire, specifically, is often searched for because it was historically a fast, ad-supported file host without the intrusive pop-ups of other sites (though that has changed).
While Mediafire can be a source for downloading games, it's essential to approach such downloads with caution due to potential risks like malware or pirated software. However, if you're still looking to proceed: