let's go: The robots are waiting!

I'll deal with the sneak attack via the secret tunnel first because it is
the intended way to proceed. Enter the City Dump and follow the wide center
path east all the way to the end. Blast the two robots along the way (don't
pat yourself on the back; that's just a warm-up). Follow the garbage trail,
going due west whenever possible, until you come to a branch south that
meets a long east-west path. Now, follow either the east or west path (they
both lead to the same ladder down). Go down the ladder and all the way west
to a door that leads to the maze of transporters. Blast the door open and
enter the transporter in the first room to the south.

Inside the first transporter, enter LETSGO and destination code 18. That
takes you to another transporter completely enclosed. Then, enter LETSGO
and codes 09, 12, and 15 (respectively) at the other transporters. The last
transport should put you right next to a ladder that goes down to the
slidewalk maze -- also known as the "binary maze," for which Horace gave
you the code (DDDUD). I didn't recognize it as a binary maze at first,
until I realized that there were two slidewalks exiting each room: one in
the upper part of the room, one in the lower! So, step onto the southern
slidewalk (D), follow it to the next room, and step onto the south
slidewalk again (D). Ride it to the next room and again choose the
southmost path (D), switching to the one on the north side after entering
the next room (U). Finally, step on the south slidewalk (D) and just coast
into the next room. D-D-D-U-D!

Now, you're in a room with the four "funny" transporters. Without the
Transporter Guidance Device, you'll just flick around the four corners of
the room, never reaching the other side of the south wall. However, since
you do have the device (right?), just step into any transporter and enter
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