Take a game. Make it indie and addictive. Also at the same time hard enough to get you playing and playing. Then add it all up and times it by ten.

When of those games you say you will play for just a tiny bit but then you play for two hours. Never gets old and makes the quest hard. Really Hard...

Has a sense of replay vaule when also making you feel smart. One of those easy to learn hard to master games but never gets old. Plus it has CAKE!