Original System: Atari 5200
Port of the 1982 Sega arcade game, Pengo is a cute action game
with some puzzle strategy thrown in. The 5200 and 400/800
ports are very similar, but the there are two changes.
First, the title screen is missing the # and 0 in front of each
option in the 400/800 port since the 400/800 didn't use those keys
for changing options (it used Select and Option). Secondly
the game music uses two voices in the 5200 version and only one in
the 400/800 port. This is assumed to be a bug as there's no
reason that it would have been changed as both systems use the
exact same sound chip.