The mainframe
Der Riese was the first map with teleporters. Three of them, marked Z-A, Z-B and Z-C on their doors, stand in the far rooms of the factory, and all of them send the players to one place: the mainframe, the pad in the starting courtyard of Der Riese. The Pack-a-Punch Machine waits on the same platform, behind a shutter.

The mainframe
The round pad in the starting courtyard, under the tower. Every teleport ends there, and every link is confirmed there.

The Pack-a-Punch shutter
On the mainframe platform. It lowers a first time at the first link, again at the second, and opens fully at the third.
A map of the factory on a wall near the mainframe lights up as each teleporter is linked.

