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I used to play a lot of Zen when I first discovered it. The reason I stopped is because, for me, a lot of the fun of pinball is the challenge of keeping the ball alive, but it's just not there in Zen because of the tiny flpper gap combined with the heavy physics. It's too easy to control the ball, so I personally don't get the adrenaline rush that pinball is supposed to provide. Thankfully TPA does a much better job of capturing that.