I am looking for a game I used to play but forgot the name. Please help!?

The game is a little hard to describe, but your basically a fragger that throws fire grenades. You have to throw the fire grenades at rocks to gain more space an bonues such as speedy boots etc. You need to find a way to corner the opponent or catch him off guard to throw a grenade and wipe him out. Anyone have a clue of the game I'm talking about? Please help! ( it's an online game only, I believe. Hope that helps!)