How would I increase the number of appliances you could plug in?

I wanted to figure out if there was a device to put between game systems (several of them operating at once + TVs, etc.) that you could plug into a wall. This gadget would allow you to run numerous electronic gadgets, say for a large scale game room without overloading the current allowance of the circuit. I’d like to get potential devices that would help with this, and perhaps good sources. If there are any.

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