Nightfall is a fantastic game that has me playing over and over again to figure out the best strategies, combos, and card chains. I think the expansion (which is an in-app purchase) makes it all the stronger. The choices you make differ when playing with 2, 3, 4, or 5. And the AI is solid. That being said, the game is complex and has a steep learning curve. The interface is good but until you know what its doing it will feel impenetrable. Theres a tutorial, but its so dense that it took me three or four times through to really grasp it. Its well written but theres a lot going on here. If you like deck building you should give Nightfall a chance. Just know going in what youre signing up for.