GRUB: Invaders

You are an antivirus that has to destroy all the viruses that have taken the OS, but to do so you must deactivate them with your loyal friend who will also grab the enemiej to you. Remember it is not safe space, watch yourself and be carefull, and don't waste time walking around, you must kill the main Virus, the source of all problems.

And remember, those are serious viruses, they may have some unconventional behaviour!