This is a game for a large group with a good amount of space for running.
Divide everyone out into groups of 2 and spread out over the designated playing area.
Every pair sits down side by side except one.
Of the two people still standing, one is the chaser and one is the runner.
If the chaser tags the runner, they simply switch.
If the runner sits down next to a seated pair, the peron on the other side of the pair becomes the new chaser.
The previous chaser becomes the new runner.