You might use this example to have 'room's of different color Button placement(How to use Canvas screen colors to create a Q&A Quiz - #18 by Italo
or you could actually make a 'map' of your rooms using geojson.io and the advice here Draw circle on a map - #6 by SteveJG and
etc., etc.
There are many ways to work with a map of rooms or an image delimited with slightly different colors. 
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