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Minecraft is a game of mining where one digs and finds ore (to put it simply). the world is composed of "blocks" 3 dimensional cubes that have different "pictures" on them, that make them appear like grass or rock or Steele or diamonds...ect. In minecraft there is also TNT which is a block just like all others except it explodes. That does not relate to the question however which is, How do i find the gravitational constant? I mostly need the formula, which my 10th grade physics class has not taught me yet so i can find the neccesary factors to solve it. Aside from just giving me the formula what ways do you think I could find G? Also, just for more info, most block dont fall but sand and gravel do so they could be key to this problem perhaps.

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You can't because gravity is constant. But if you dig below the bedrock, you fall which means that there is another source of gravity besides the main map. –  jinawee Feb 20 at 9:23

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Just use the free-fall equation. The time spent in falling from a height $ h $ verifies this:

$ h - \frac{g}{2} t^2 = 0 $

So you get:

$ g = \frac{2h}{t^2} $

Note that you have to determine the height $ h $. How?, maybe you can estimate it thinking that the game's character is about 1.80 m.

The $ g $ you are obtaining here is the acceleration of the gravity. In order to get the "universal" gravity constant for the game's universe, $ G $, you'll need to know, or at least estimate, the mass of the planet and the radius of the planet... or the ratio $\frac{M}{R^2}$

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