I Know that I am late but check that you have enough swap space then it will became very slow! but not crash. Also if posiible close programs and even unnecessary processes. You can see RAM memory usage with program called resource usage from the default menu should have at least 20% free swap
G means gigabyte M means megabye Mem means memory usage/total memory Swp means swap space 0K/0K means no swap space at all.
And of cource run resource usage when game is running
Or yes, there is another way to force the game close
press CTRL+alt+F2 and type in username and password (it is normal that your password is not visible) as TheDead said, but then type htop and mark game processes with space and arrow keys then press f9 to kill and send kill signal 9 from the list on the left side of your screen with arrow keys then hit enter and press CTRL+F7 to get get back to the desktop. This way you don't lose anything but the game that was open.
G means gigabyte M means megabye Mem means memory usage/total memory Swp means swap space 0K/0K means no swap space at all.
And of cource run resource usage when game is running
Or yes, there is another way to force the game close
press CTRL+alt+F2 and type in username and password (it is normal that your password is not visible) as TheDead said, but then type htop and mark game processes with space and arrow keys then press f9 to kill and send kill signal 9 from the list on the left side of your screen with arrow keys then hit enter and press CTRL+F7 to get get back to the desktop. This way you don't lose anything but the game that was open.