At Camp Ventorum, I never really know what to expect. On the one hand, the defenses are pretty strong and can make life a lot easier. On the other hand, there are also a few extremely nasty waves that you have to be very careful about. But this time the battle score isn't all that high. So don't panic, everything will be fine.
It's small (just 154 MB), not time-limited, and offers a couple hours of fun!