Portal 2 builds on everything that was great about the first game. You still use portals and cubes to navigate the test environment, but they add just enough to keep it interested, especially once everything starts to interact. The only real gripe I have right now is with the lack of twich based puzzles, where you really have to place Portals quickly to succeed. There are very few mid-air portal placements in this one. Regardless it's a great game.

Duels of the Planeswalkers is a good introduction to the world of Magic: The Gathering. Featuring many cards from the core sets, and some nice decks with good combos, it should offer a challenge to any new or experience player.

While not being able to build your own deck from scratch is a slight annoyance, and unlocking cards is time consuming, the challenges are really one of the more interesting parts of the game.

Lilliana is a pain.

If you want a challenging game that will test your strategy making, pick this up.