my taco bell charged $1.50 for them...i only picked up centipede, i wasnt very impressed.  it runs in a window, not full screen, and the controls were horrible.it worked ok with the arrow keys, but the mouse input sucks.  you have to keep the cursor within a small area under the playfield to get it to work.  i was hoping that it would be awesome so i could play the evolved verion on my mame cabinet, but that isnt going to happen.  if i didnt know about mame, then my opinion may be different, but once you have played centipede in mame with a 3" trackball,it is really hard to play it like this.