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For a very quick game, with accuracy as the #1 priority, 2-on-2 half-court is a great drill. It works well for teams that only have one court to work out on, as well, since you can run two games at once.
Just put run piece of tape straight down at the 1/2 way point of your net, and a small piece of tape at the 1/2 way point at each end line, and you're ready to go.
You can run it to a set number of points (if we do that, we play rally score, to emphasize serving, as well) or in a Queen of the Court format, where the winning team stays on as long as they get the point.
Either way, it's fast moving, and requires good passing skills, accurate serving, and tight defense, which will help your team on the large court, as well.