"... to Hell."
You start in the middle of a field with no instructions, so like any conditioned gamer you head right. You soon find a well you can sloooowly climb down, but the bottom is locked. All you can do is climb back up and keep moving.
Everyone's least favorite part of gym class, now in 16-bit form.
You come to a castle where you can go left or right. If you go right you'll fight your way through hordes of enemies and your reward is a one-way drop to a boss you can't kill.
Look on the bright side: at least it isn't the sequel.
Did we mention that there are no save points? So you die and start all over, and this time when you enter the castle you go left and find another fork in the road. One path leads you to a gun that can kill the boss ... in a room that traps you with an electric field.