Download Lode X
Lode X is an interesting platformer designed by a Japanese developer. Despite the fact that the game does not also have the English language added into it, it will not be hard for you to understand the aim of the game. You will have to travel through all of the levels in order and for opening them it is required to have a key.
Each of the levels in which you are able to participate requires you to collect a number of other different elements in order to reach the key that will then be used to open the door.