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Yeah

Portal Defends comes with NG-Achievments. I like achievements. They push you to play the game any further and so you learn a lot more about the game and are getting better and better.

Portal Defenders is realy challenging at the beginning but I wanted the Medals and so i kept playing.
There were two or three medals of wich I thought I can get if I try and at the moment I got them there were some more medals possible and now I got them nearly all.

...KEEP PLAYING