In Gravity Jar you must help Norman, a cute alien, to get back home after he accidentally beamed himself in a galaxy far away. With the help of his gravity jar (hence the name), he can convert specific elements into the energy it needs to get back home.
The gameplay is simple, when you recognize 2 or more identical elements next to each other you must tap on them to release the energy. The faster you tap the better, since these elements have a short half-time.