Hey there,
If you're following the RESTFUL resource conventions you might want use:
map.resources :system, :has_many => :title, :path_prefix => '/store/'
This would generate handy little routes that could prove very helpful:
system_title_index GET    /store/system/:system_id/title(.:format)          {:controller=>"title", :action=>"index"}
                   POST   /store/system/:system_id/title(.:format)          {:controller=>"title", :action=>"create"}
  new_system_title GET    /store/system/:system_id/title/new(.:format)      {:controller=>"title", :action=>"new"}
 edit_system_title GET    /store/system/:system_id/title/:id/edit(.:format) {:controller=>"title", :action=>"edit"}
      system_title GET    /store/system/:system_id/title/:id(.:format)      {:controller=>"title", :action=>"show"}
                   PUT    /store/system/:system_id/title/:id(.:format)      {:controller=>"title", :action=>"update"}
                   DELETE /store/system/:system_id/title/:id(.:format)      {:controller=>"title", :action=>"destroy"}
      system_index GET    /store/system(.:format)                           {:controller=>"system", :action=>"index"}
                   POST   /store/system(.:format)                           {:controller=>"system", :action=>"create"}
        new_system GET    /store/system/new(.:format)                       {:controller=>"system", :action=>"new"}
       edit_system GET    /store/system/:id/edit(.:format)                  {:controller=>"system", :action=>"edit"}
            system GET    /store/system/:id(.:format)                       {:controller=>"system", :action=>"show"}
                   PUT    /store/system/:id(.:format)                       {:controller=>"system", :action=>"update"}
                   DELETE /store/system/:id(.:format)                       {:controller=>"system", :action=>"destroy"}
                          /:controller/:action/:id  
Your URL will look slightly different though:/store/system/xbox360/title/Mass%20Effect
Remember to override the to_param method in your system and title models so that the id would be the actual names of the object instead of just numbers.       
Hope this helps!