Can You Stop People Joining Your Private Match on PS3?

No foolproof method exists. PS3 private matches aren't fully secure:

• Friends on your list can join without invite.
• Party members auto-join.
• Game exploits may bypass privacy settings.

Minimize Risk

1. Leave any party before starting.
2. Only invite trusted players.
3. Use complex password if game supports it.
4. Play with known friends only.
5. Report exploiters to developers/Sony.

Settings vary by game; a small risk always remains.