U6 works perfectly fine even on a 10 years old phone. It only needs 3000 cycles to run properly, it’s extremely lightweight. I’ve played it on numerous devices, including an old Galaxy S1 (1 GHz single core cpu), and a Galaxy Tab E (1.3 GHz no-name bullshit cpu). Both of these lowest-possible-end devices are already capable of running Warcraft II btw. So all you need to do is create a new game profile, set cycles 3000, and you’re good to go. 🙂