When I first got the machine, I was amazed by the 3D effect. I still am. I posted tips players could follow in order to enjoy the 3DS in its 3D glory and not get ill. Those tips are certainly helpful, and I haven't gotten sick to my stomach from playing the 3DS. As time passed, I did get headaches and a general worn-out feeling — even with the 3D in its weakest setting. I'm not alone: My wife made it about two days with the 3D and then switched it off. However, my 7-year-old played with it for the recommended time and thought it was "really cool". It is cool. It really is. 3D images without the need of stupid glasses! Before the 3DS launched, there were reports on how it takes twice as much effort for human eyes to reproduce the 3D effect. I've found this to be true. Eye strain has left me feeling like I'm cross-eyed (I'm not, so do not worry). I've been trying to figure out why I'm experiencing this. Of course, it's no doubt a side-effect of autostereoscopy. But I've been wondering if there is something intrinsic to the way that the 3DS is set up that makes players (read: me) more susceptible to issues. The anecdotal conclusion I've reached is that it is the result of having two screens. The top screen can display the 3D effect, while the touch screen is in 2D. Players typically end up using both while playing, but focusing on the top screen. So while playing, players eyes will focus on the 3D, and then have to re-focus on the 2D as they use the touch screen. This focusing, re-focusing and then focusing again could be the cause of issues I'm having. The other issue is that the 3DS requires a sweetspot for the 3D effect to be viewed. So you must stay in the same position to view the 3D effect. Shifting position might mean that you have to tweak the 3D effect. Even pressing buttons on certain games, thereby causing the handheld to move slightly, can impact the 3D effect. This makes it difficult to relax — like listening to music and constantly have to turn up and turn down the volume. You can't focus on simply playing.