Random variables

[CTavernier]

Hi everyone!
I'm looking for a way to add random variables in a project.
I want to insert a little game in a tour with multiple possibility for the user.
By clicking on the "start game" I want to set the variable value from 1 to 3, randomly...
Someone knows how achieve that?
Is it possible by adding javascript code somewhere?

THX

[soulbrother]

If a frequently change would be applicable, you can use a timer, that counts every x seconds and adds a vaulue of +1 to your variable.