can 700mb go higher like 789mb or 800mb cause i got a game that 793mb can i play 793 mb game?

700mb cdrs can be overburned, but definately not by 89mb. You're either looking at a DVD game or the image file itself. If it's the image file you're looking at, it's always bigger than the size of the data it's burning.

try and burn it onto an 80 minute cdr and i am sure you will be pleasently surprised!
I guarentee you that the game in under 80 minutes (even though it's more than 700mb)