This guide will tell you how to throw Grenades through WALLS in Modern Warfare 2.
The game has introduced a new item called “Grill charge”. It will allow you to drill through a wall and then you can release an explosive this will kill the people on the other side of the wall. So you have to equip this as it is very helpful.
After equipping the drill charge, you have to throw a grenade on the wall and it will drill through the wall. It will blow up as it has a great blast radius. It will kill the people on the other side.