laser tag system

HI, i have to make laser tag system. so i start research and i found this video on youtube " - YouTube "
and unfortunately i have to make same kind of things. so please help me how can i make this thing and how can program arduino to communicate with each other ?

Do you need all the same features?

Firing an LED and detecting them require no other communication.
What is your goal? A school project or a usable game?