Who is superfluous in 4

The idea of game consists in that to find an excess subject from 4 presented.
Press a knife switch after have made the choice.
For each pressing of a knife switch you spend 1 star.
Having pressed the button with a question mark you receive the hint to level for 2 stars.
Each 3 minutes the free star is born (as soon as the star has become green on the button - press it).
In the beginning games 10 stars with which it is necessary to pass 40 levels are given.
The winner of game will see super robodance!
Good luck!

* IMPORTANT INFORMATION *
In the beginning games when you see the help screen with descriptions of buttons, press a red star from above and receive additional 10 stars.