Minecraft – How to find mushroom biomes

Where did the equation E = 3.5 * n * (n + 1) come from? I see that you say it came from the wiki, but I am unable to find it on there. I do see:

For any given level, the experience, E, required to achieve the next level n+1 from the current level, n is: E = 7 + roundDown(n * 3.5)

Thus, if you were level 0 you would require 7 experience to achieve level 1, which is not the case with E = 3.5 * n * (n + 1). To advance to level 2, you would need 10 more experience, a total of 17, not 14 more experience, with a total of 21. I hope that equation is not correct (because I just spent an hour on what I think is the correct one), and that would explain why you don't have to kill 1785 hostile mobs before level 50.

I've come up with E = 7n + round(3.5(.5(n^2)-.5n)) - n/4)

• E is the total experience needed to reach level n.

• "7n" accounts for the constant 7 experience required to reach every next level. This is the only experience you must collect to reach level 1. E = 7 + roundDown(n * 3.5)

• The ".5(n^2)-.5n" provides the number of 3.5 increments between level 0 and level n, but ignores the rounding down. Because the rounding down is not yet accounted for, I have "-n/4" (without this, the equation says you require one more experience than reality every 4 levels). E = 7 + roundDown(n * 3.5) Ex. Between levels 0 and 1 the number of required 3.5 experience increments is 0. Between 1 and 2 the number of 3.5 increments is 1. Between levels 2 and 3 the number of increments is 2. Between levels 0 and 3 the number of increments is 3. 0 + 1 + 2 = 3 3*3.5 is 10.5, and then 7*3 is 21. 10.5 + 21 is 31.5

• The "round()" rounds up some E values ending in .75 that result from the "-n/4". 31.5 - 3/4 = 30.75 round(30.75)= 31 And so you need 31 experience to reach level 3 from level 0.

With this equation, you require 4625 experience to reach level 50, which /5 is 925.

This was related to the Dimensional Doors mod, and it is now resolved with newer versions (I am running 1.3.2 with my install of Big Dig and it is all fine, and mobs are back).

Reference can be found here.