1. When you reach the finale level, at the very left side end when you're in front of the house, you will not be able to go any further because there is a wall blocking your way.

2. Next to the wall will be some rocks. You have to try and jump on the highest rock. The trick is get a good run up and jump. If you do not succeed just practise find the easy way to get on there.

3. When you're up there make sure that your teamates can get up there. There are two things to watch out for:

Smokers - make sure that at least one of your team mates are up there so when you're being dragged they can quickly melee you. The other thing to watch out for is when the Tank throws his rocks, but to avoid getting hit by it, the rocks that he throws are breakable so have quick reflexes, and shoot them.