A casual game is a video game targeted at or used by casual gamers. Casual games may exhibit any type of gameplay or genre. They are typically distinguished by simple rules and by reduced demands on time and learned skill, in contrast to more complex hardcore games. They typically impose low production and distribution costs on the producer. Casual games are often played on a personal computer online in web browsers, but are also popular on game consoles and mobile phones.
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You would want to check for any programs running in the background, as well as run a virus scan.