The low-tech/no-tech paper version of the English Quadrant Word Race (included in Pīsō Ille Poētulus Teacher’s Guide, as well as the upcoming Teacher’s Materials for Rūfus et arma ātra) is an awesome, simple, input-based competitive activity.
The more-tech version is to take 5min and make a Kahoot quiz for the whole class, or teams. On Kahoot, students earn more points the faster they answer, so you’ll get a whole class/team winner (vs. the 1 winner per pair in the low/no-tech paper version).
The process is the same—just read slowly in the target language, and when students hear you say one of the options, they choose it on their smartphone/computer.