Other times you'll have to defeat a certain number of enemies — way more than two — but do so quickly so a pressing doomsday clock doesn't tick down to zero. (vg247.com)
Sometimes they mix it up with the quiz levels, or levels where you just have to take out a certain number of enemies in a short amount of time and thus avoid commanders and bosses, but these are in the minority. (nintendotoday.com)
For example, a hunter may be required to kill a certain number of enemies or kill a particular creature, whereas someone who is trying to master cooking must create a spectacular dish with a certain number of ingredients and some very rare. (impulsegamer.com)