What do i do with MULTIPLE RAR FILES?

i have downloaded 1.4gb size game and its broken down into 30 smaller sizes rar file. I tried to unrar few of the the file and all of them seems to be similar ISO file. I'm not clear of the procedures from here as i know i need to mount the file because i am not burning the ISO file into a cd. It is a pc game Romance of the three kingdom XI. Each size of the rar files when i unpacked has the size of about 2gb. Anyone know what should i do?