Switch Inferno is the 19th Expert stage in Super Monkey Ball 2, and the 38th Expert stage in Super Monkey Ball Deluxe. It also appears as the 148th Ultimate stage with continues, and the 188th without.
The layout is two stories tall. The top story has the goal, which is hidden underneath the platform. This story also has 64 switches, arranged in an 8x8 pattern. Of these, four raise the goal for a few seconds. Thirty trigger the movable, left wall, and thirty trigger the movable, right wall. Either wall will smack the player if he or she does not hit one of the four that is correct.
The bottom is a simple platform that is connected to the top via a ramp. You cannot access the goal from here.
As previously described, this goal is hidden underneath the top story and inaccessible from the bottom story. It can be uncovered by pressing a correct switch and rushing towards the goal. See "Switch Locator" below for more information.
For a spoiler on exactly which switch to press, look below.
The best switch to press is the one that is third from the left and fourth from the back. Hit it with a running start and head into the goal.
A basic strategy is to press two incorrect switches and escape to the bottom story. Use the map and take note of those that did NOT light up. Return to the top and press an unlighted switch to reveal the goal. Keep hitting correct switches until you can make it through the goal. If you accidentally hit an incorrect switch, remember its position and try again.