At lv 3 just run around and don't kill anything ! Let the bats pile up for about 5-10 minutes you can kill them in one hit BOOM lv 14 lol thumbs up if you try this and works (:
Gotta nice little secret on a super lv up (: when ur a lv 3 let all the bats pile up for about 10 minutes after you save your rage use the chainsaw and hit them when your raging and you should boost up about 9 levels (:
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you got to save the princess bro