Glossary term Retention
Scarcity Bias
The tendency to place higher value on things that are rare or decreasing in availability. Energy systems, limited-time events, and first-purchase bonuses all create artificial scarcity to increase perceived value.
Where you see this in practice
The mechanics that lean on it
Retention02
Energy / Lives
A system that limits how many attempts or sessions a user can have within a given time window.
Retention07
Limited-Time Events
Temporary content, challenges, or reward tracks that expire on a fixed deadline, creating urgency to engage now.
Monetization13
First-Purchase Bonus
A significantly enhanced reward package offered exclusively on a user's first transaction.