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Jared - I have never had a hammer blowup a blocker. The game has refused to even put a hammer on a blocker let alone blow it up. I know little about the inflated cost but costs of items have gone up from time to time. One thing I do is to solve all levels without boosters and only use them on Mountain on Friday thru Sunday to get more open time to play and solve the normal levels. Takes time to solve some of the really hard levels but this is a logical mental exercise and should be challenging as you get further along in the game. Hope you can ignore the inflated cost of hammers and have many days of happy gaming ahead...