To dream that you are playing tag represents your level of determination and agility toward achieving your goals. If you are the one being chased, then the dream means that you are trying to dodge some responsibility.
If you are the one who is doing the chasing, then it signifies your instincts and your determination to go after what you want. The dream may be telling you that “you’re it!”. You are the chosen one or the one that is chosen for the job.