The if the game doesn't start (something about missing libasound_module_conf_pulse.so) you will need to install libasound2-plugins:i386
The amd64 lib is installed by default but you need the i386 lib for the game.
Missing libasound_module_conf_pulse on ubuntu(amd64)
Re: Missing libasound_module_conf_pulse on ubuntu(amd64)
It would be nice to have 64bit version available as well.