CitiTag is a wireless location-based multiplayer game, designed
to enhance spontaneous social interaction and novel experiences
in city environments by integrating virtual presence with physical.
In the first version of CitiTag you roam the city with a GPS- and
WiFi-enabled iPaq PocketPC in search for players of the opposite
team that you can ‘tag’. You can also get tagged yourself
if one of them gets close to you. Then you need to find a friend
to free you. Urban space becomes a playground and everyone is a
|There are two teams in this game, the Reds
and the Greens. Each is trying to be the dominant colour, by
tagging members of the opposite team.
a player has been tagged, they are trapped in the colour of
the opposite team until one of their team mates sets them free.
a player comes close to a team member that has been tagged,
they get the opportunity to 'untag', to free them.
When were the initial trials?
• Multiplayer game experiment in Bristol Centre (June
2004) - Read about
the Bristol trial.
• First trial at the Open University (March
2004) - Read about
the OU trial.
Yanna Vogiazou, OU (Game concept, visual design, user studies)
Bas Raijmakers, RCA (Game concept, user studies, documentary production)
Josephine Reid, HP (Project management, user studies)
Erik Geelhoed, HP (Research methods consultancy)
Ben Clayton, University of Bristol (Mobile
Bristol system implementation, technical support)
Marc Eisenstadt, OU (Research Mentor (Synchronous Social Software))
Kevin Quick, OU (Multiplayer server implementation)
Jon Linney, OU (Flash client programming)
Peter Scott, OU (Project management, consultancy)
Lewis McCann, OU (Infrastructure support)
Phil Stenton, Richard Hull, Stuart Martin, Paul Marsh, Tom Melamed,
John Honnibal, Rachel Eardley.
For further information email Yanna:
Why develop Cititag?
The CitiTag game is being developed to explore social experiences
and emergent behaviours in public spaces through playful interaction,
based on the awareness of other players’ presence. The
project is motivated by the hypothesis that very simple game
on presence states (e.g. I am Green and ‘tagged’)
can result in an enjoyable social experience, stimulated by real
interaction among players. The aim of our studies is to identify
the design implications for future technology mediated social
experiences and how such experiments can inform the experience
||The project involves the collaboration between HP Labs and the Open University’s Knowledge
Media Institute (KMi). KMi’s Centre
for New Media is developing the client software and multi-user
server. The user trials will provide data for Yanna Vogiazou’s
(OU) and Bas Raijmaker’s (RCA) PhD work.
Want to read more?
Three documents on CitiTag in PDF format: