secondary requirement

Even though most classes in an OO model will perform a single, specific function, they often share common, secondary requirements with other classes.

Coupled that with vastly different packaging requirements for a small, light, normally aspirated engine meant that concerns over drag became a secondary requirement to downforce.

Each level is initially marked with a shadow, but this can be filled with a medal by fulfilling the secondary requirements of a carrier mission (by destroying buildings, freeing survivors, and collecting RDUs), or by getting a good enough time in a Bonus mission.