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Pros
Pro More different layouts than most score games
Aside from bonus screens, which repeat after every third level, screen layouts only repeat after every 9th starting after the 12th. Each layout plays slightly differently, so you get a variety of different difficulties and strategies before any of them repeat.
Cons
Con Marathon game
The game does not have an ending or kill screen, so getting a higher score depends mostly on surviving longer and clearing more screens. Riskier strategies for squeezing out extra points exist, but are less effective than safe conservative play.