Line of Fire is a Sega Master System game. It is based on the Sega X Boardarcade game of the same name. As the Master System cannot handle real-time scaling and rotations, the game was reinterpreted as a vertical shoot-'em-up.
Jack, a solider of the Allied Forces, manages to infiltrate the enemy base and discovers a state-of-the-art assault rifle. Soon after however, he is detected and attacked by enemy soldiers. Hijacking an enemy jeep and later a boat and a helicopter, Jack must pass through enemy lines and reach Allied Headquarters.
Gameplay
The game is an autoscrolling shoot-'em-up played in three different vehicles (a jeep, a boat, and a helicopter) over land, sea, and air. All of the vehicles control identically. Enemies in the game inhabit one of two planes, the land and sea or the air.
Vehicles are moved in any direction with the D-Pad (but can only move partway up the screen). Vehicles fire their machine guns with . The machine guns have unlimited ammunition and hit enemies in the same plane as the player's vehicle (terrestrial targets for the jeep and boat, aerial targets for the helicopter). Some levels contain ramps that the jeep can use to hit aerial targets with its machine gun. Vehicles fire guided missiles with . Missiles have limited supply and hit enemies in the opposite plane as the player's vehicle (aerial targets for the jeep and boat, terrestrial targets for the helicopter). The missiles can be guided with the D-Pad after they have been fired.
Vehicles have a health bar, which allows them to sustain multiple hits from the enemy before being destroyed. The game ends if a vehicle run out of health, but it can be continued from the start of the current level if the player has continues remaining. The player's health and missile supply are carried over to the next level.
Enemies are hot on the player's tail. Jump on your hijacked jeep and engage rifle armed and grenade throwing enemy infantry. Defeat the gigantic soldier with shield to escape outside. Enemy gun emplacements and jeeps will make escape problematic. The Big Tank with two powerful artillery guns at the end of the level will be powerful adversary, but at least the player can evade its cannon fire by remaining mobile.
This thick jungle is divided by many small rivers, so the player should use ramps to jump over them. In addition to the soldiers, attack helicopters will start to harass the player. Be on the look out for the supply trucks which will drop valuable supplies. At the end of the level, the player will face a large dual rotor transport helicopter that will drop parachutes bombs on them. They should bring it down with missiles or machine guns while jumping over the ramps.
It is time to switch to the boat. The whirlpools will damage the boat and make the player lose control momentarily. Avoid floating mines and falling bridges. Frogmen will appear out of nowhere to send the player into the depths. In addition to the new attack helicopters and other small attack boats, propeller-driven bombers will test their World War II-era dive bombing techniques on the player. As usual, sink supply boats for additional supplies. The player will have to sink a destroyer and then a submarine to finish the level.
Back in the Jeep again, the player will be fighting for their life in a very enclosed road. As they try to avoid the boulders, enemy jeeps will attack them from behind. Bazooka-armed soldiers can turn the player's jeep into a smoldering heap while gun batteries will distract them from the bombers from the air. Destroy the Jumbo Bomber at the end of the level with missiles.
A massive desert and equally massive number of enemies are waiting for the player in this level. Even more advanced attack helicopters, fighter planes that look like F-14s will attempt to bring the player down. From the ground, the player will be facing relentless SAM batteries, two different types of gun batteries, cannon mounts and tanks. Shoot down supply planes for supplies. At the end of the level, the player will be facing a massive flying fortress. Bring it down by eliminating engines, gun mounts, missile launchers and finally, the cockpit.
The player is now very close to friendly lines, but the enemy is also equally desperate to stop them this time. Enemy commandos will hide in the forests and attempt to shoot the player down with their MANPADS, a new type of gun battery and mobile battery will fill the sky with flak. From the air, the player will be facing an even newer version of the enemy attack helicopter and three different types of fighter planes that will attack them. Destroy the supply trains for much needed power-ups. At the end of the level, the player will stopped by a seemingly indestructible enemy fortress, complete with small fighter hangars, gun mounts, missile launchers, and laser guns. Destroy the control tower to end the mission.