Use a candleholder that includes a glass sheath. The solution has been known for a long, long time, because a major cause of flickering unprotected candles -- or even extinguishing them -- is that you walk around while holding them.

With a clean, dry wick it's pretty easy to get a very still flame for a long, long period of time. Though if you have a fan or something blowing, you're out of luck.

I imagine a vigorous game of Wii Tennis will cause those candles to flicker.

And will provide a convenient excuse why I was unable to return that serve.

Unfortunately your excuse is no good, because Tennis does not use the Sensor Bar.

Well then that's my excuse! I thought it did, so I was making sure to point the controller in the proper direction, while my opponent was cheating and flicking it any which way.

Look, it wasn't my fault, ok?

Miniature lightbulbs works to the same effect. Anything that emit near IR works.