Augmented Reality Treasure Hunt

We're going to be sponsoring a 4000pax conference in December at the Mebourne Conference and Exhibition centre, and would like to understand the cost of using an Augmented Reality Treasure Hunt for items scattered throgh the exhibition centre and around southbank (confined to 'safe' areas - e.g. no road, etc) . (iOS support is the priority, either app or in-browser with simple way for attendees to continue previous AR sessions). Scope would be to have attendees easily access an online game, enter credentials which we can correlate back to their attendee information and score points by collecting artefacts. Would need a leaderboard so we could award daily prizes. Could be provided as a services for testing + the duration of the conference, or as code to be run on compute services provided by us and supported by the dev team for the duration of the engagement. We have a graphics team that can likely assist with artefact creation, however they may or may not have the requisite bandwidth given other commitments. Price is neg. based on scope.