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I need ideas for a multiplayer mobile video game!

Hello! I am Frenzikk, and I would like to ask you all for some video game ideas for my next project! It needs to be a mobile game, multiplayer, up to 4 people. ONLY 4 PEOPLE. It can be 3D. To point you in the right direction of what I am wanting, here is a list of things that might spark some ideas in your head : Space, Building, Sandbox, Action, Shooter.    ALSO, it needs to be "KID-FRIENDLY", sort of. I don't want any blood, or real guns. Laser guns are fine, but nothing bad.      Thank you, Frenzikk.