After every level you'll have the option to upgrade your tank and buy more weapons or ammo. As the levels go up the enemies will increase in number and will be more powerful. So be careful and avoid getting hit by the enemies or you'll lose health. Use the special weapons cautiously as they are limited in supply. . W,A,S,D Fire-E, Aim-Mouse, Shoot-Left Click

After every level you'll have the option to upgrade your tank and buy more weapons or ammo. As the levels go up the enemies will increase in number and will be more powerful. So be careful and avoid getting hit by the enemies or you'll lose health. Use the special weapons cautiously as they are limited in supply. . Drive your tank around and destroy wave after wave of red enemy tanks. Upgrade weapons and survive for as long as you can.
W,A,S,D Fire-E, Aim-Mouse, Shoot-Left Click

In Quake II, the brutal Strogg attacked Earth, looking for fresh ways to re-supply their cyber-organic army. A lone marine broke through their defenses and defeated their leader, the Makron. The Strogg built a new Makron, however, and in Quake 4, you must join the invasion of the Strogg homeworld, where humanity’s only hope lies in your ability to access the highly-fortified structure containing the Nexus Core. There, you can disrupt all Strogg communications and give the marines the upper hand.