Open source Doom.
"Why, it's only five dollars,"
The alternate monster designs. The Mancibus is this weird slug thing, the Hell Knight looks like an actual knight instead of Baron of Hell's kid brother, the Beholders are these floating glass orbs containing the skull things, and the Cyberdemon is a multi legged tank piloted by some demon. And the Grunts, ohboy.. They look as pathetic as they are. They're so badly made, it must have been done on purpose. 🙂
The included level designs aren't bad, either.
Try playing this with someone like Community Chest 4, it's an interesting experience.
Path of Exile, basically eating up all my time now. Playing it on Xbox though (PC version is a lot better) since I also play when I'm on the treadmill. 😛 Basically the spiritual successor of Diablo 2 that I've been looking for for quite a while now and basically gets everything right IMO. And it's f2p.
Got around to playing FFXV last week, just beat it tonight.
Not... all that great, sadly. Story was garbage and the combat was very meh. The fact that they left out major character development arcs in order to release it as DLC in the form of character episodes instead of just including it in the main game is ridiculous. One of my least faves in the series, unfortunately.
Also, extremely easy.