2. The second age-old strategy is intuitiveness. This is different from simplicity; Candy Crush — or even Minesweeper — isn’t “simple.” But after you play it for a bit, you intuit the rules. Games that go viral don’t need massive instruction manuals or help files because users intuitively grasp how the games work.
3. Finally, games that go viral have a recognizable storyline. Save the girl. Beat the bad guy. Claim the trophy. When a user succeeds in a viral game, he doesn’t do so only on a virtual basis; he can also relate his success to a real-world counterpart.