Simplify the following text for a Grade 9 native English-speaking person.
Original: Duke Nukem 3D players often used the IPX network utility Kali or the Total Entertainment Network ( TEN ) online service .
Simplified: Duke Nukem 3D players often either battled modem-to-modem , using the $ 20.00 IPX network utility Kali or the Total Entertainment Network ( TEN ) online pay service .