Yes, the same one as it was set up on.
The other option is to factory reset the device. It'll delete all apps and settings and require you to set up the device again and reinstall everything. Plus game saves and whatnot will be cleared out. But you can do that by turning off the device, holding volume down and turning it on again. Then you should see an Android with a ! behind it. Push power button once and you should see a few options. One should be factory reset. Use volume to scroll to it and push power.
If that doesn't work, consult your manual. It should have directions for factory reset. If it doesn't have a manual, put what the device is into Google and you should find a manufacturer's website pretty quickly.