In the summer of 1998, Appu Ghar started its next chapter with the addition of its first water park O.Y.S.T.E.R.S consisting of a wave pool, rain dance, lazy river, and multiple water slides. O.Y.S.T.E.R.S donned various avatars throughout its life time converting the water park into a snow park as well as a heated water park in the winters. Appu Ghar successfully operated this park for over two decades and because of an excellent recall value, the park received an average of 1.4 million visitors annually.