X23  kinda cool. there should be a speed control though.

collision detection... and not passing through one another would be good too. and maybe cell-shaded with the lines of the squares might look cool too.  
(Version 1.0)

X23  hmmm... for a press release that says :

"free software for every American on Oct. 28"

and lists zero time zone cut-offs... seems like those in states 49 and 50 aren't actually considered "American" by the folks at CodeWeavers.

how nice of them.

seem to recall Hawaii and Alaska being mentioned quite often this year too... guess it didn't sink in.   
(Version 7.1)