One keyboard, two players.
Okay.. that one wasn't the hardest. I Just followed a tutorial from Unity Official channel, but, I've added a few things, such as events, energy, collisions damage, day-night cycle etc...
I thought that maybe trying to review an official tutorial would make me code a bit more properly and would get me rid off my bad habits. There are some screenshots
Health's at the bottom left and the energy bottom right. The energy slowly wears off as you drive, and every time you'll shoot, it'll go down
A day-night cycle that lasts around 3 minutes.
Here, the top player has destroyed a box containing a tank upgrade. He can now shoot farther and has more hitpoints.
Every now and then, an air strike will occur. It'll drop bombs on a straight line, you better watch out for those red lights, they will warn you!