I originally shared my Tiger 1 privately on my phone just to get it to my laptop, the nuclear upgrade was entirely for fun but based on experience, probably not best to be used on mobile due to the power of the shells. Activate 1 activates the turret and coaxial MG, group 2 is the hull MG. There is a major issue with the suspension where some road wheels bounce around a bit and I simply don't know how to fix it, the roadwheels themselves are slightly innaccurate as until recently, I didn't notice that there were 4 layers instead of 3 and I don't have the patience to change that. Again, be aware that using the nuclear 88mm on mobile will probably crash the game (obviously based on how strong the mobile device is).