How to make variables not refresh with each page.

I am trying to make a simulation in which images change colour depending on the choices a learner makes. I made different numeric Variables, one for each image. Then I made various states for each image. So I made a trigger to relate the variable to the change in colour (E.g. When the variable = 1, the object will turn blue, when the variable=2, it will turn green)

I also set triggers for buttons, so the variables would increase or decrease. The idea was that when the learner pressed the button enough times(2 times), the image would turn green. I wanted this to span across the slides. So the learner would make a choice, the button would change the variable and bring the learner to a new slide, where the image's colour has change due to the change in the variable value.

The problem now is that the variable is reset as it goes to the next slide. Does anyone know how I can make the value of the variable not reset to 0?