Bluetooth supports up to 7 players. Players 5-7 gets an combination of lights. The Wii U Gamepad uses Wifi instead of Bluetooth and doesn't count for those 7. I'm not sure if you can reach 8 players Wiimotes and Pro Controllers as they both use bluetooth. For Gamecube controllers, you need 2 Adapters. Since this fills all the slots, you should use a disc for this option
3DS Friend Code: 047387541842