You are a cleaning guy at a big retirement villa for the elderly people. The greedy manager of the villa sees no profit in hosting these penniless citizens so he wants you to get rid of these old people and accommodate younger and richer people who have more money at retirement. If you don't do this, you will be fired! The more people you kill, the more experience you get to upgrade your skills. Grab the keys as these allow you to reach different levels within the retirement home. Work your way through each level and take down the final boss to continue.