MechWarrior 3 is a vehicle simulation game, part of the MechWarrior series. It featured a new 3D accelerated graphics engine at the time of its release. The game contains over 20 missions, with access to 18 different mechs. A novelization called Trial Under Fire was written by Loren L. Coleman. Mechwarrior 3 is a first-person mecha simulation game, where the player pilots a Mech in each mission. Mechs are giant armored robots and fitted with various projectile and energy weapons. Mechs engage in combat with other mechs as well as traditional military vehicles such as tanks, helicopters, and occasional weapon emplacements. During combat a Mech's weapons and critical components can be damaged, and it is even possible for entire limbs to be blown off of a Mech. Mech customization is a major aspect of gameplay. The player has near total control over the configuration of each of his or her Mechs. From the type and amount of armor used to various internal components, and all of the Mech's weaponry and ammunition. In the campaign additional parts, weapons, and ammunition are acquired through the missions, captured supplies, and salvaged enemy Mechs. Also in the campaign, the player controls up to three squadmates, with the ability to issue basic orders such as attack, move, and return to the Mobile Field Bases (MFBs) for repairs. The Mobile Field Bases are a unique feature not seen in any other Mechwarrior game. The player starts the game with three MFBs, although these can be destroyed. The MFBs travel with the player throughout the missions advancing when ordered to by the player. They carry all the player's supplies, which means there is a weight limit to the amount of supplies the player can keep. The MFBs can provide field repair and resupply provided they are carrying sufficient armor and ammunition. As Mechs do not have shields, and are only protected by armor which is damaged in combat, the MFBs can become crucial in enabling the player to complete a mission.