One student creates a simple clapping rhythm, and the class repeats it. The next student adds on to the rhythm, and the class repeats the longer rhythm. This goes on until everybody has had a turn or until the class forgets the rhythm.
A quick collective game to guess your location based on the 3D/virtual context clues. When ready, you can select a location on the map and see how close the guess was in miles:
A classic guessing game to engage the sense of sight (object in the classroom) and get everyone participating.
If you want to start off class with a riddle of the day, here is a good resource with over 100 of them:
https://parade.com/1025662/marynliles/brain-teasers-for-kids/
A classic game that can be played in ~5 minutes and includes everyone: