Out of bounds
In the Pikmin games, it is possible to use exploits or glitches to go out of bounds. Having a leader or Pikmin outside of the normal area boundaries allows players to take shortcuts, reaching certain points before they're intended to, or to go to places they're never intended to reach. Some ways to go out of bounds involve and count as glitches, while others, like throwing a leader to a ledge out of bounds, do not.
Below is a list of places where it is possible to go out of bounds.
On the ramp in The Distant Spring near the UV Lamp, it is possible for Olimar to go out of bounds by getting pushed by a Spotty Bulbear. The player must awaken the Bulbear, go about halfway up the ramp, while the Bulbear goes to the side of it. The Bulbear will try to bite Olimar, and assuming that Olimar and the Bulbear are facing the same direction, Olimar should be pushed out of bounds. This glitch is usually used in speed runs, as a faster way to collect the Chronos Reactor.
One can do a similar feat in The Forest of Hope in Challenge Mode, by going to where the Shock Absorber is in story mode. There, the player can wake up the Bulbear, and have it shove Olimar down below the stage, where he will respawn out of bounds. This is done by going to the wall, lying down and having the Bulbear lunge. Sometimes, the Bulbear will push Olimar underground, to where he will respawn on a normally inaccessible ledge. From there, the player can walk all the way around the area, while removing Olimar’s collision detectors on some objects. Using this, one can also enter areas where they normally can't, until a gate has been destroyed. However, with no Pikmin in Olimar's party, he can become trapped behind these walls.
In Pikmin 2, there are several ways for one to go out of bounds.
One way to do this is the boulder jump glitch. When a leader lies down, they make a small bounce. If they collide with an Armored Cannon Larva or Decorated Cannon Beetle rock, or a falling boulder, then they will bounce high in the air, and potentially land out of bounds.
Another way to do this is to go near a sloped wall that one wants to go out of bounds on, and make the leader lie down. A Pikmin will automatically pick the leader up, and with some walls, and some Pikmin types, the Pikmin will carry him up the wall.
A leader can also clip into the ground by using the seesaw glitch, and end up appearing out of bounds.
In Pikmin 3, going out of bounds is often done by throwing a leader in a certain location, such as on top of a dirt mound, or by wedging on the side of certain edges, as in the Yellow Onion cave in Distant Tundra. Another way is to use a technique that makes use of wedging into a corner, getting a leader into the scenery, and whistling and dismissing. The final way is by the dodging, by using it to get from an elevated place to out of bounds. An example of this would be on the ice slide in Distant Tundra.