Has your N64 joystick been acting up? You try to move up the menu but the cursor jumps down instead? Perhaps it's the time to clean your joystick and add a bit of lubricant. Here are few steps to repair your n64 joystick:

1. Turn the controller upside down and remove all nine screws, while removing the screws keep the controller held face down, as all the internal parts are mounted into the front/stop/joystick side of the unit.

2. Gently pull the back cover away from the front cover, and place the back cover in a safe location.

3. Now is the time to open up the joystick box but leave the joystick box connector and cable attached to the main circuit board (this is my personal recommendation).

4. Gently lift the light grey slots up and away from the dark grey tabs. The box should open up into two sections. The stick sensors attached to the connector cable, should now be gently removed from the joystick box and left to dangle from the circuit board in the controller body. If you've done well, you now have a light grey half of the box, a dark grey half, and the sensors dangling from the circuit board.

5. Use the rubbing alcohol and cotton swabs to clean all the parts and get rid of that nasty dust. If you need to, you can use a toothpick to gently remove bits of plastic dust in the corners of the pieces and box.

6. Lightly apply lubricant to the black curved swinging bar and the inside of the white box.

Caution: Do not apply lubricant to the black notched disks on the white box, the light grey case, nor to the notched section of the black curved swinging bar.

7. Finally reassemble the joystick.
Now your joystick would not give you any problem and you can play the game easily.