I bought this game for me and my brother , and it's one of my most successful purchases.
I really enjoyed the difficulty of the puzzle-not too much difficult
The game continues the tradition of the previous game and improves it.

The game was able to run on an old computer - and worked properly.
I enjoyed playing with my brother even though not played too much together.

After finishing the game, there are some Mods that add to the "experience"
I loved:
Portal Stories: Mel
Aperture Tag: The Paint Gun Testing Initiative
Portal Reloaded