Gravity

Gravity is a force that appears in all Mario, Wario and Yoshi series games which draws Mario, Wario, Yoshi or Luigi towards the ground and sticks them there, only allowing them to jump.

Yoshi's Universal Gravitation
In Yoshi's Universal Gravitation, gravity makes its first notable appearance. However, it only appears in a few levels. But if the player tilts the GBA left or right, the world tilts accordingly, which doesn't appear in any other Mario or Yoshi game.

Super Mario Galaxy
Gravity appears in all games but it makes its biggest appearance in the game Super Mario Galaxy where, in multiple levels, there are many different forms of gravity. Black Holes use gravity to draw Mario or Luigi, if they fall into them, into the singularity and defeat them. Some of the other Planets have a stronger pull and can pull Mario back to them no matter how far away he goes from them unless he uses a Pull, Sling or Launch star. Gravity also appears as a force to be manipulated in several levels where gravity pulls Mario towards special walls called Gravity Walls. There are also two other manipulations of gravity in that game. First, there are Gravity Arrows, which change the gravity's flow in certain areas and Gravity Spotlights, which either increase or decrease gravity, drawing Mario towards another place or allowing him to stick to other surfaces.

There are three different types of gravity in Super Mario Galaxy:


 * Normal gravity, which draws Mario in on all sides of the planet. This allows Mario to traverse the underside of a planet. An example of this is the mini-planets in Gusty Garden Galaxy.
 * Downward gravity, which pulls Mario down, regardless of the planet. This causes slopes that Mario cannot climb, and also bottomless pits. An example of this is the Honeyhive Galaxy main planet.
 * Outward gravity, which pulls Mario to the sides of a planet when he is inside one. This can happen in circular or cylindrical planets. An example of this is the Tower Planet in Bowser's Galaxy Reactor or the warp pipe area in the inside of the Asteroid Planet in Good Egg Galaxy.

Super Mario Galaxy 2
Again, gravity appears in Super Mario Galaxy 2, having the same purpose as in Super Mario Galaxy. In addition to the three types of gravity listed above, there are two other types introduced in Super Mario Galaxy 2:


 * Orbit gravity, also referred to as "fall forever" gravity, which occurs only in cylindrical planets. Instead of falling toward the planet, Mario will actually fall around the planet. Examples of this are the Log Planet and Abandoned Rocketship Planet on Tall Trunk Galaxy and Space Storm Galaxy, respectively.
 * Spiral gravity, which occurs only in the Trunk Wheel Planet on Tall Trunk Galaxy. Instead of falling toward the core of the planet, Mario will, again, fall around the core.