What factors do you consider a game to be addicting?

[Fire Emblem]

Can be Android game, Facebook App, or any pc game.

What can make you really stay for hours or log in to play the game every single day?

 

[B. Diddy]

Welcome to Android Central! Here are some factors I can think of:

No intrusive ads
No in-app purchases
No overly frustrating levels
Satisfying sound effects
Some degree of variability
Ability to save progress