Good-quality, casual games should be easy to learn and play, yet be compelling enough to keep you engaged while you're waiting for a bus, standing in line at the supermarket or just killing time.
You want a game with simple rules and one that doesn'trequire any commitment on your part. Play it, put it down, pick up from where you left off. It's that simple.
Blyx, from Pearl Fisher Games, falls into that category.