anniversary event is a big deal
bring something new to the game every week!
don’t let them play too much in a short period of time to let them play for a long time
make each day of the week unique to keep you motivated to play every day
require a time lapse to log in again
a quest that can be attempted only at a specific time each day
Keep track of the amount of resources circulating in the game and maintain a normal in-game economy!