Hmm.. I've seen that game as a native Mac game once, in the eighties. Called Citris, I think.
Anyway, you need to have a compiler installed - Xcode or Developer Tools if you have an older version of the OS. Once you have that, download the source from that page, decompress it and walk to that directory in the Terminal. Type the following:
./configure
make
sudo make install
I'm getting a few warnings during compile, but it seems to work.