Source of random numbers

What is the pseudorandom number generator used?

In Construct 2?

I would use choose(randoma,randomb,randomc,randomd,randome,etc)

I think he means what is the method used by Construct 2's random number generator. No computer number is actually random. Pseudo-random numbers are generated by using the clock and/or other algorithms.

Unfortunately, it's not documented. Maybe something is listed in the SDK? I'd start there or pm Ashley directly.

I believe that Construct classic used mersenne twister. So its possible that C2 uses the same thing.

I suspect through some reading, that Javascript uses the browser's implementation of PRNG.

Looking in C2's exporters directory I found that yes, javascript's Math.random() is used for random. But the algorithm used is left up to the browser's javascript engine as per the Javascript spec. However generally from what I found they all use Linear congruential generators. But I didn't bother to look further to see if anything has changed with newer browsers.