Like the best puzzle games on Facebook, Zoo Invasion inspires the kind of compulsion that drives you to either bug your friends for more hearts to play with or simply whip out the credit card and buy more. That kind of ... inspiration is thanks to a number of things that Nexon seems to have done right with Zoo Invasion.
But be quick about it! Each round in Zoo Invasion lasts a mere 60 seconds, inspiring lightning reflexes and pinpoint accuracy out of players that truly want the high score. Sure, this framework--combined with weekly leaderboards--has been done by countless puzzle games before, but it simply works. Without a similar system, much of what compels us to play more simply wouldn't be there.
It's tough to ignore the desire to best either your own time or your friends' in Zoo Invasion. That's especially so when your friend's avatar literally crushes yours on the leaderboard whenever that friend beats your score. It doesn't help that Zoo Invasion has seemingly mastered that easy-to-learn-hard-to-master play hook that's essential to any iconic puzzle game. We mean it--achieving a high score in Zoo Invasion is downright difficult.
If you can't manage triggering Fever--a flashy score multiplier effect that occurs after a few matches in quick succession--in a round, you're probably not going to beat your friends' best. This is especially problematic considering power-ups have yet to make it into the game, but we expect that when they do they'll only serve to spice things up. (They're currently teased as "Coming Soon!")
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