A great twisted game! The computer character is even more twisted than the mind bending mechanic of gameplay

If you are into intense action, this is not for you. But if you enjoy the twisted puzzle solving, this is worth experiencing.

on the good side:
Portal brings a new dimension to puzzle solving with its game play which, at times, seriously challenge the mind. Opening entry and exit portals onto walls is not particularly challenging, but when you have to find a way to gain enough momentum to emerge from an exit portal to clear a 100+-yard gap, it's something else.

My personal favorite is the "character" of the central computer which provides a surreal narrative to this already unusual game. Take your time to listen what "she" has to say.

On the negative side:
I would have loved to play a bit longer, but I suspect that mods may come out in the near future.