Multiple unity games in 1 app in ios and adroid

Is it possible to create a start screen where there are links to different unity games? What I am planning to achieve is something like a lobby where all the available games are presented. When user click on a game that is the time it will load the game. All the games should not be loaded with the lobby bec the file size would be too big. We never know how many games we will put in here and often times we will add new games.

I tried searching and can't seem to find a clear solution. We are trying to port our flash games to unity. In flash we can have multiple swf for each game then we also have a swf for the lobby. That is what we are trying to replicate. We are working in a team and each would create their own games without worrying about the lobby. I am not sure if creating a different scene for each game would be the best solution.