Do I need a special adapter for wireless controllers on PC?

Xbox controllers work via Bluetooth or the Xbox Wireless Adapter. PlayStation DualSense connects via Bluetooth or USB-C. 8BitDo includes a 2.4GHz dongle. Most modern PCs have Bluetooth built in, but a dedicated dongle or adapter provides better reliability.

Are back buttons worth it for PC gaming?

Yes, especially for shooters and action games. Back buttons let you jump, reload, or dodge without taking your thumb off the right stick. Once you adapt, it is hard to go back. The DualSense Edge and 8BitDo Ultimate both offer this feature.

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