Is it possible to update a game without Wi-Fi if so how do i do it? Minecraft for ps3?

Yes, if you buy a recently released game they sometimes have updates on them

It is necessary to update a PS3 game through a wired or wi-fi internet connection. It implies on both disc based and digital games. However, you can manually update the PS3 system software by using a flash drive after installing the system software from a computer. Hope this helps.

Your PS3 needs internet access, which is usually accomplished by connecting your PS3 to the router or modem in your home using either Wi-Fi or an Ethernet cable. You can buy an Ethernet cable, in various lengths, at any computer store.