You need an additional ticket for certain routes or services within the VRR. The ZusatzTicket can only be used together with another valid VRR ticket.

The additional ticket costs €4,40 and is valid for all price levels. When the area of ​​validity of a time ticket is extended, the time validity depends on the extended route. 

Basically: 
One additional ticket is required for each person, journey and additional use.

The ZusatzTicket is valid for:

• Extension of the scope of validity for individual journeys, for time tickets up to and including price level C (per person and journey)

or

• for persons brought along in extended areas of validity

or

• for 1st class use (the SchokoTicket is excluded from 1st class use)

Good to know:

• Additional tickets are available from the STOAG app, at machines, at the driver's, in the STOAG customer centers and in the advance booking offices.
• Please stamp the ZusatzTicket before you start your journey, otherwise it is not valid. The ZusatzTicket bought from the driver has already been validated and no longer needs to be stamped.

Bicycle ticket:
To take a bicycle with you, you must purchase a bicycle ticket for €4,40 in conjunction with one ticket per bicycle.

The ticket is valid throughout the VRR and is valid for 24 hours from validation.