How do you earn free linden?

[BotName4k]

Someone told me you can do a quest that will give you free linden. Is that true?

[Wulfie Reanimator]

Look up Linden Realms and PaleoQuest. 

[Rolig Loon]

Search for Portal Park, which is Linden Lab's entry portal area to all of its games.   Then just walk thought a portal to get to the game you choose.