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The author conducted a reverse engineering analysis of Block Blast's Android app. According to related reports, the author analyzed Android version 10.8.2 and iOS version 7.4.9, and found that after installation the game downloads encrypted JavaScript rules from a server; among them, RewardHighValueAdHarvestTrait requests an unsolvable lethal puzzle when the player has watched three rewarded ads in a row, the current ad price reaches 3.5 times that of the previous one, and the score exceeds the historical high score by 1,000 points. The report also states that the game runs an XGBoost regression model on the phone to estimate the player's ad value eCPM, and uses it to decide revival opportunities and ad types. The author released three evidence packages and reproduction scripts, claiming that the decoded results match the memory dump of the running app byte for byte. Currently, this analysis is reported by a single source, with no subsequent independent verification or official response.
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How Block Blast Uses Ad Prices to Decide When Players LoseDevelopments
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Oct 16
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How Block Blast Uses Ad Prices to Decide When Players Lose
The author conducted a reverse analysis of Block Blast Android 10.8.2 and iOS 7.4.9, finding that after installation the game downloads encrypted JavaScript rules from a server, among which RewardHighValueAdHarvestTrait requests an unsolvable lethal puzzle when the player has watched three rewarded ads in a row, the current ad price reaches 3.5 times the previous one, and the score exceeds the historical high score by 1000 points. The game also runs an XGBoost regression model on the phone to estimate the player's advertising value eCPM, and uses it to decide revival opportunities and ad types. The author released three evidence packages and reproduction scripts, claiming that the decoded results are byte-for-byte identical to the memory dump of the running app.