I usually don't get too excited about the web flash games myself. However, these Atari versions at the Chrome App store are pretty authentic for flash based. Once you install them they are always just a click away from that quick and dirty tempest or centipede fix. I use a thumb trackball mouse so that makes centipede, missle command, even a tad more authentic on the laptop.
Atari: Missile Command, Centipede, Lunar Lander, Tempest, Asteroids, Battlezone, Millipede, Asteroids Deluxe, Crystal Castles
Get those here:
https://chrome.google.com/webstore/search?hl=en-US&q=atariI just discovered this one and I'm gonna check it out now...
Nintendo 8 bit hits:
https://chrome.google.com/webstore/detail/bfjokmbfklgdmfahhfcnbkilomimlnln?hl=en-USEnjoy!
