https://gamemakerblog.com/2008/11/04/gprotect-a-simple-solution-to-time-limits-in-games/
GProtect: A simple solution to time limits in games? | GameMakerBlog
Jan 6, 2009 - GProtect, an easy way to limit people to sixty minutes of playtime? What GProtect does is nothing new. It's been done so much in demos that I want to kill...
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