App Reviewed on: iPad
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Gravity Jack is an endless runner that takes a lot of not-so-subtle inspiration from Jetpack Joyride. However, in this game, players are playing as if they have the ability to reverse gravity to avoid obstacles rather than using a jetpack to accomplish the same task. Although Gravity Jack is very clearly a shameless rip-off in almost every way, it does offer some fun for those interested in switching up their runner du jour, just not very much.
In Gravity Jack players will control the titular protagonist as he tries to escape the alien science lab that--presumably--gave him his gravity flipping powers. To accomplish this task, players can tap Jack once to have him jump over obstacles and tap twice to flip gravity. The goal is to get Jack as far as possible while avoiding enemy aliens and other obstacles.
On top of this, the game has a few additional features and mechanics, like the gravity meter, which limits how long Jack can stay up on the ceiling, and the ability to jump on enemies Mario style. Fortunately, these facets of the game help differentiate it from otherwise being almost exactly like Jetpack Joyride (even down to the art style). That being said, there are also aspects of this game that make it considerably less fun to play.
For starters, the game--despite trying to crib Jetpack Joyride's sprite-based art style--becomes a visual mess at times due to poor character animations and poorly styled obstacles. In addition, there are advertisements all over the game that just distract from the game experience. I could go more in-depth, but it's probably easier to just say that if Gravity Jack had made no effort to differentiate itself from the game it is ripping off, it would just be a categorically inferior version of the original.
But hey, at the end of the day, Gravity Jack is free, and it is a bit different from its source material, so it's easy enough to check out if you're interested.