Brainstorming encourages free-flowing thoughts and collaboration among team members to bring new and innovative concepts to the table.
Look around you
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This might not look like much but when you sit back and look around you can actually see a lot of things going around you. Games like subway surfer, angry birds are just daily activities turned into games.
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Get Game ideas from the internet
There are many forums where people discuss game ideas. There is a subreddit for this and almost daily a new idea gets discussed there.
Ask existing customer, friends and family
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Consider taking advice from your game-playing friends and family. Try to reach out to your customers and ask them what they would like to play next.
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Read Books and Watch Movies
Reading books and watching movies can give you a lot of ideas.