What is Appointment Mechanics?
Timers and expiring resources are tuned so that missing a specific window means losing progress or rewards. The app, not you, ends up setting the schedule.
Where it comes from
'Play-by-Appointment' Game Design (2000s)
How it hooks you
Exploits time-based fear of missing out: expiring windows push you to log in at the app's chosen moment to avoid a loss.
What the research shows
Studies of game dark patterns identify time-gated events and regenerating timers as central 'appointment' mechanics that keep players tied to their devices.
Source: Zagal et al., 'Dark Patterns in the Design of Games' (2013)
How to resist it
Turn off timer notifications, ignore 'optimal' windows, and prefer games that can be paused without penalty.