Both cooperative and competitive games and drills have their uses in volleyball practice. And maybe so does a third type: cooperative-competitive.
We often look for ways to make things competitive in training. When doing that, though, make sure you think about the potential outcomes of the scoring.
I'm not a huge fan of having blockers working against hitters on boxes for multiple reasons, but this version is better than most I've seen.
This is a good small-sided game-play exercise that gets every player lots of touches and works especially on transition hitting.
Here's something you can do to help work on your hitters becoming better at attacking the block rather than just trying to hit around it.
This drill allows passers to work on receiving hard serves, and servers on serving them, but without lots of missed serves leaving passers standing around.
This pepper variation introduces playing the ball over the net, which increases the game-like element and movement and puts added pressure on ball-handling.
This volleyball drill gets a lot of players active on one court working on serving, passing, setting and hitting - and potentially blocking and defense.