How to install every 32 bit librarie on Ubuntu 12.04 64 bit?

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http://askubuntu.com – Hy! I bought a new laptop this Christmas and installed Ubuntu 12.04 64 bit edition on it. I downloaded Steam and bought Trine 2, but I can't get it to work. I installed ia32-libs, but still nothing. Is there a chance to install every 32 bit libraries on my laptop? (HowTos)