In Cats on Duty, an army of evil zombies is invading the humans' yard. Players must place cat defenders on the lawn in order to defend each lane. That's just like PvZ! The difference here is that placing cats costs different kinds of colored cat food currency. To earn said currency, players must make matches on the puzzle field located on the left side of the screen. Making matches costs sausages, though, which accumulate over time and can also be earned by defeating zombies. The puzzle aspect adds a big new wrinkle to the already fun lane-based tower defense formula.

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