How do you get a lot of money in Maplestory and level up fast

kill the hardest monster that you can kill over and over and over and pick up the money or make a party and let them kill the hard monster and then you take the money that it drops and you also get some of the exp when a party member kills a monster and if you kill it you get bonus exp

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I believe that isn't very efficient, for the gaining money part. I believe that you should wait on events, and collect as many of them as possible. Later on u could sell them off for 1-15mil if 1-30 equip anything above level 80 equip could get you over 100mil or so I've heard. Happy hunting!
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Sell your things in free market by getting nx. You can also sell nx which i heard you can sell for a lot 25k Nx for 250mil. You can also go to leaprecans and pick up from them because they drop 1k each