One of Mario's enemies in the game Super Mario Land. Gao looks like a sphinx and spits fireballs at Mario. Gao are easy, though, since they don't move.

Here's what one looks like:
  #######
 ##O++ +O#
 ##########
#   #+#O+ +#
# # #+######
#####+#O+ +#
#+++++######
#++++##OO#
 #####++O####
   ##++++OOO##
  # ++++++++OO#
 # +++###++++O##
 # ++# +++++++O#
## +#####+++++O#
#+++# +++++++O##
 ##############
They're worth 800 points.