Factory is the 5th Expert Extra floor in Monkey Ball, Super Monkey Ball, and Super Monkey Ball Banana Mania, as well as the 15th Expert Extra stage and the 265th Ultimate stage without continues in Super Monkey Ball Deluxe and the 95th Marathon stage of Super Monkey Ball in Super Monkey Ball Banana Mania.
This stage features an infinite number of goals being carried by claws. The claws are gray and have orange tops. The goals are hanging upside down. In front of these goals is a platform made up of a ramp, two walkways, and a slanted catwalk.
Roll to the slanted catwalk, and then roll across it. Then, go to the back of the right walkway to build enough speed. Then, roll into a goal to complete the floor when a goal from your right approaches you.
Players can try hard to roll into a goal that is down the ramp while also getting a banana bunch. This way, however, is considered much more difficult to clear the stage as it requires very good timing to get into a goal. Roll down the hill at about 28:80 seconds at a moderate speed, and veer slightly to the left to clear through a goal.
Players can also use the left walkway, and roll up the left side of the slanted catwalk to get into a goal. This way is still usually considered very challenging. Try to gain enough speed, and veer slightly to the right when a goal is slightly to your right. This should result in you clearing the stage.