Wow, great call by YC and patience by the founders.
They didn't plan on building games for android and iOS. I remember them for being a 100% flash-site that offered a mediocre tetris-clone until they were sued by the tetris-copyright-holders.
"Draw Something" was an extremely fortunate product: a) they finally had a hugely popular game which took everyone by surprise and b) they made so much money that Zynga decided to just buy them instead of spending weeks/months on copying them and losing money every day they didn't have an alternative to "Draw Something"