Entering Invasion

Entering Invasion is a Single Player level in Q2.

Walkthrough
Turn left and collect the 2 Nails, then go through the doorway. Kill the 2 Ogres and avoid the 2 Zombies. Collect the 2 Rockets to the right and the Nailgun in the back half of the room. Enter the doorway to the right and kill the 2 Grunts. Collect the Nails on the opposite side from the entrance. Ignore the doorway straight ahead and instead go through the one to the left. Kill the 2 Ogres, then collect the Rocket Launcher in the middle of the room. Return and kill the 2 Zombies before going through the previously ignored doorway. Turn right at the end of the corridor to enter the next room. Kill the 2 Grunts and turn left. Collect the Nails to the left and 2 Rockets to the right before going through the doorway straight ahead. Kill the 2 Ogres and collect the Rockets across from the doorway. Turn left and go through the next doorway. Kill the 2 Fiends on the same side as the entrance. Cross the room and go through the doorway to the right. Kill the 2 Grunts.