The memory should be plenty for installing the game.
But as you’re talking about urbanterror, you might just have not enough space on your harddisk (on the / partition in particular).
The game data is big, the urbanterror-data RPM package is 1.8GiB big (compressed).
The package is downloaded and saved to your hard disk, which needs 1.8GiB on /. Then it is uncompressed and installed, which additionally needs at least the same amount of space.
So please post the output of:
df -h
Probably you just should enlarge your / partition. Use some LiveCD (gparted e.g.) for that.
Well, 3.2 GiB is not that low… (but too low for installing and then updating urbanterror-data obviously )
A standard installation does only reserve 20GiB for / if you create a separate /home.
You might be able to gain space by cleaning out /tmp/, /var/tmp/, /var/cache/ (zypp in particular), and/or /var/log/ though.
I think I should trasfer from sda4 to sda3. Is there a way to make it from yast?
Yes, YaST can do that, but there’s no way to do that in the running system.
You have to unmount the involved partitions first, and you obviously cannot do that with / and /home.
Boot from the GParted Live CD e.g. (GParted -- Live CD/USB/PXE/HD) , or any openSUSE Live medium (the Rescue CD should have gparted as well I think, and YaST is on all of them).