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extra damage; if you have a sword but it still does not do the damage you want, well get critical damage on your ememies. If you want to deal critical damage jump then attack, it deals more damage and kill your emeies faster, its good if your fighting lots of mobs or players.
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no doors; does your door slow you down or does it break when mobs break in your house, well easy fix replace your doors with slabs! just put one slab on top where your door use to be. if you want to go in your house just crouch and go through it. mobs cannot crouch and they can not break it. the only proplem with this is that baby zombies and spiders can go in so its best if you put real doors behind the slabs beacuse siders and baby zombies can not break doors.
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faster trips up and down; when you go mining you would propely just make a stair case with no stairs. well when you put stairs on your mine it makes you go up and down quicker and you will loose less hunger so you do not have to go find food more often. the only proplem with this is it needs the stair and to craft them you need lots of stuff but evey time you craft stairs it gives you six!