The recent hard times for the social gaming market have been harder on some games than others. Last week, social-gaming mega-publisher Zynga decided to shut down two well-established parts of its catalog. First, the servers for Roller Coaster Kingdom (RCK) were shut off, then Ponzi Inc., a promising game Zynga got as part of a Challenge Games acquisition less than a month ago, went dark for good.

So, what can we learn from the abrupt termination of these two games? Well, one lesson seems to be that the standards for success in social gaming are going to keep increasing — at least for the big publishers. Despite their declining popularity, both Ponzi Inc. and Roller Coaster Kingdom had a relatively decent number of monthly active users when they were closed — 221,000 players for Ponzi and 1.2 million players for RCK. That might not seem like much compared against Farmville’s industry-leading 62 million monthly players, but it probably doesn’t seem like chump change to many struggling social game makers just getting their start.

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