Zynga, the makers of social network games such as Farmville and Cityville and the world’s largest app developer, could be in a bit of trouble.

Look at this chart from AppData.

Daily active users at Zynga were falling, so it decided to buy OMGPOP, which made Draw Something, for $210 million. The acquisition helped add some pop to Zynga’s daily active user numbers.

But it didn’t last long.

Daily active users are back to where they were pre-OMGPOP acquisition. Draw Something has 9 million daily users, according to AppData, which tracks usage through Facebook log-ins.

If you take out the nine million users, then Zynga’s other games are down significantly since February.

What will they do now?

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