They only have one use - to unlock EX3 Costumes in Resident Evil 6, all EX3 Costumes cost 1 Extra Ticket.
The events that give out Extra Tickets are the following:
- Pax Aeterna
- Neutralize the Threat
- Agents, Abductors, Chainsaws
All these events require a global goal to be achieved by all participating players, however the goal on the Xbox 360 is always lower than on the PS3 and the Steam goal is non-existent, so all Steam players will always get a ticket just by participating in these events.
All versions following the original PS3, Xbox 360 and PC versions cannot be linked to RE.NET. Instead, all EX3 Costumes are unlocked via the Extra Content modes.