you need to enable the lib32 repository in your /etc/pacman.conf
then do: pacman -Sy
then, install lib32-nvidia-utils (you can also use nouveau driver, but the game it's quite slow) and a bunch of other lib32-xxxx dependencies (lib32-glibc, et al) although from now on the game would complain about missing libraries and you need to just do pacman -S lib32-[library]
then do: pacman -Sy
then, install lib32-nvidia-utils (you can also use nouveau driver, but the game it's quite slow) and a bunch of other lib32-xxxx dependencies (lib32-glibc, et al) although from now on the game would complain about missing libraries and you need to just do pacman -S lib32-[library]