I've tried all 4 of the current Hip Pocket games, and am very impressed with Cube Farm. Pipe Game is great for 2. Nexus is pretty dull, and the random card placement of Agora is novel at first, but then becomes annoying.

So, in Cube Farm, you play cards to build the office floor, taking control of choice cubicles (those in walking distance to the good stuff like water coolers), and trying to prevent your opponents from getting any choice cubicles. The rules for taking cubicles are that you must be able walk to the elevator without walking thru walls or cubicles, occupied or not, or onto the open table (unless it's a fully enclosed table space that can't be filled with a card, which can be walked thru).

The strategy usually consists of trying to place the big point stuff, like 4's, where they are only accessible to a cubicle you control, and avoid creating cubicles near good stuff that your opponents can snatch up. It gets really interesting when the elevator starts getting surrounded and there are very few cubicles available, on the table or via playing a card (there are a few extra elevators in the deck, though). Our only gripe was that there aren't enough screw-you cards or they're too hard to place (there are a few receptionists and vice-presidents which decrease a cubicle's value if it's in walking distance) - it's usually pretty hard to find a good spot that will screw your opponent(s) without screwing you.

I've tried 2, 3, and 4 players - 4 was best so far. Don't know if more will be even better. I highly recommend it as an addition to one's Cheapass collection.