Glossary term Retention
Zeigarnik Effect
The tendency to remember uncompleted tasks more readily than completed ones. Set collection, quest tracking, and season pass progress bars all exploit the Zeigarnik effect, the visible incomplete progress creates a cognitive pull toward completion.
Where you see this in practice
The mechanics that lean on it
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Set Collection / Completion
A mechanic that organises rewards into named sets, where completing a set unlocks an additional reward or status.
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Daily / Weekly Quests
Structured, time-limited objectives that direct user behaviour toward specific actions and reward completion.
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Season Pass / Battle Pass
A time-limited reward track with free and premium tiers, where completing in-app actions advances the user along a progression of rewards.