Where should I go for this?

Mate,

I am newbie here. While searching through the internet I found this forum and feel free to join. Actually I am looking for a gaming site where can I get lot's of challenging games. Basically I want to improved my gaming quality playing challenging games. So looking for a better place.

Please help me!

You'd first have to tell us what sort of games you're looking for.  "challenging" doesn't help - Candy Crush can be challenging as can Minesweeper, but I'm guessing you're not talking about that type of game.

Yes sure, my targeted niche is challenge. Do you have this types of games or website link?

 Again, I refer to my previous reply.  Based on your question, the only place I can think of is http://www.mensa.org.uk/puzzles