I've seen the Cube in question, and I really liked it, even though it was a very different movie. Cube 2: Hypercube had an interesting premise but a flawed execution (it felt like the hypercube in question had no logic except the needs of the story behind its behavior) and I haven't watched Cube Zero yet.
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"With the first link, the chain is forged. The first speech censored, the first thought forbidden, the first freedom denied, chains us all irrevocably." [...] The first time any man's freedom is trodden on, we're all damaged. - Captain Jean-Luc Picard
B*tch, meet reality. Reality, meet b*tch. - Me