There’re lots of provided features by Ninja.io unblocked game. For using all of these, you need to register and log in first. Otherwise you cannot use all the features. Yet, weapon selection doesn’t require any cash or XP. Allowed weapons can be selected by players freely. Registered players can make the selection among more options. E.g. flamethrower is only unlocked for logged in players. See top players menu for dedicating yourself to be in the hall of fame. On this menu, best players are presented based on daily, weekly, monthly and all time. When you start battling, you’ll see it’s not going to be easy on those list, at all.