Actually 8.5/10 points, but still one of the best puzzle solving campaign I ever played

The difficult is just fit with team 3 players + 1 stupid bot in Advanced level. It took us more than 3 hours to finished. We finished when there were still things that hadn't been completed yet. There are a lot of bombs and kits which help us to stand against the ton of hordes. However, the final battle had some error when the gascan did not re-spawn so we must use cheat.