+o-+
|
+ | + +
/| |/| |\
4 o /\ + o o v
2 +->\-+---+---+---+ 6
\ | | |
+ + + +o-+ +
o | \| /
+ +o-+ + +
2 |/ o
\ 1 +
v /
+
2 = Mega-Maze Basement (Part 2)
4 = Mega-Maze Basement (Part 4)
6 = Mega-Maze Basement (Part 6)
Here is the universal key.