Attract
Scratch to reveal
Effort: Medium
What to notice
Rubbing a silver panel gradually uncovers the offer underneath.
How to build it
- Decide first whether everyone gets the same perk or it is a draw.
- Keep scratching to a few seconds and offer a button that reveals everything at once.
- Store the result so reloading shows the same outcome.
Measure
- Main metric
- Offer redemption rate
- Guardrail
- Returns driven by the offer
When it backfires
Purchase-linked draws fall under Japan’s premium caps. State the odds and prizes clearly.
Theory behind it
Variable reward
When rewards arrive unpredictably, people repeat the behavior more.
Well supported
Information gap theory
A small gap between what people know and want to know makes them want to close it.
Well supported
Japan’s premium regulations
In Japan, prizes tied to a purchase are capped by the Act against Unjustifiable Premiums and Misleading Representations.
Law and official guidance
Playable demos
Try the same mechanism in a playable demo.