You should have mentioned it was 30 for next gen but about 20 for current gen.
Hell I bought mine yesterday digitally for 20 pounds and it is totally worth that.
Also, if you keep up with MGS, you don't even really need to play GZ to know what happens next, especially since the '13 GDC trailer basically shows you the ending and you make out the rest yourself easily. You don't NEED GZ to understand the plot for TTP but it helps of course.
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I heard that current gen plays it terribly at times.
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The game is playable but there are obvious flaws, especially in draw distance where things essentially render as you go. I mean I don't mind it really but the difference is considerable with next gen. Nonetheless the graphics still look great for last gen.