I've tried SL about six years ago. I'm not sure if it is a game. It's a virtual world with its own rules (and prices!) Everything has it's price in "Linden dollar" there, so don't even think of SL if you aren't ready to spend real money for virtual things.
BTW, conversion of your local currency to linden dollar may be quite painful! That's the main reason I've left SL and not going back.