Virtual Reality. From the dawn of time, games have always created it. It's the magic circle where we transport our players for a few minutes, a few hours, a few days, even years. With today’s new Virtual Reality Headsets and AR Smart Glasses, we finally reach the intersection of movie like immersion and the interaction possibilities of games. On one hand, Virtual Reality offers an unprecedented theater for engagement. On the other, it presents more physiological, psychological, and gameplay challenges than all other platform shifts in games' history combined. This talk presents the 5 most common mistakes VR/AR developers make, discovered in XEODesign's year of VR research. We then present practical VR design strategies to overcome them. If you want to ship a VR/AR game and not a barfatorium, you must hear this talk!