and do i prevent gamesave when i crash the game before 5 minutes are over (i dont mean rollback!)?
There are many ways that the game saves.
When you join a game.
When a trade is made.
When you or someone leaves a game.
Every X minutes.
I think there is a random save or something else Im missing too.
What you will be looking to do is crash a game before a save or during the save cycle. Realistically there probably arent too many roll backs left, especially with the bnet server upgrade which eliminates a lot of the overloading data rollbacks. Its very unlikely that there are many one-player roll backs left that will be easy to find, so you will probably be looking for those caused with multiple players or special events. I remember hearing of one involving a trade screen and a cow portal that may have gone unpatched since it wasnt widely known, maybe start there. But seriously you gotta stop posting questions about rollbacks, there arent going to be many people here who know any and no one would tell you how to do it anyways. The chances are so slim that you will find one that you should probably just give up anyways.
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Im taking computer sience in college right now. Im taking what im learning in school and trying it out on a 12 year old game.
Oh wait sorry. Everyone here just rips everyone off and puts their little twist on a code.