Tough as in, no matter how many times you beat them down they keep getting back up.
“Does reality exist or is it an illusion?”
Simple. If there is an illusion, there is a real. Even the most dramatic skeptical argument must rely on at least one objective fact, hypothetical or otherwise, in order to work. Otherwise you run into a problem with “everything is false,” which is self-contradicting.
Stop with the bloody “Matrix” philosophies already. That question is the mullet of philosophy; no one says you can’t ask it but you’re going to look foolish if you sport it.
Or if you want to persist in solipsism how about letting me have $100? After all, it’s not real.