One of the best game I played is actually warzone 2100, it's not an new, actually it is quite old. Still It quite fun to play. And it is now open sourced. Which is cool. More importantly, I found it in ubuntu's repository. Which means I can now install it on ubuntu by using synaptics.
I wonder how to get snapshot, when it is in full screen anyway.
To install warzone 2100, in ubuntu,
sudo apt-get install warzone2100
for background information
warzone 2100 resurrection project