+--+----+o-+ +
/| /| |\
3 | 3 | o 3
| +--+--+
+o-+ |
| o +o-+
| + \ \
| 3 5
+--+o-+
|
+-o+ + +o-+
| o |
+-o+--+--+
/ ^
4 /
+--+
/ ^
v \
5 1
1 = from Mega-Maze Basement (Part 1)
3 = Mega-Maze Basement (Part 3)
4 = Mega-Maze Basement (Part 4)
5 = Mega-Maze Basement (Part 5)
Here is the universal key.