Thunder Force II is a 1988 shoot-'em-up developed by Technosoft for the X68000, and the second installment in their Thunder Force series. The following year, it was ported to the Sega Mega Drive as Thunder Force II MD (サンダーフォースII MD), and this version was released worldwide as simply Thunder Force II. It was the first third party Sega Mega Drive game.
After the events of the first Thunder Force, the defeated ORN Empire decide to attack the Galaxy Federation again. The ORN Empire creates a powerful new battleship, the Plealos, which they use to destroy the planet Reda and take the planet Nepura as their own. Eventually, the Galaxy Federation learns that ORN houses Plealos deep below Nebula's surface when not in use, and they set out to destroy Plealos with a new version of the powerful "Fire LEO" fighter craft, the Fire LEO-02 Exceliza.
Gameplay
The game is a shoot-'em-up whose levels are split into two gameplay styles: top-view and side-view stages. Top-view stages are the free-roaming, overhead stages from the original Thunder Force. The screen constantly scrolls in the direction that the ship is facing. The objective is to locate and destroy the cores of four enemy bases. Side-view stages play like a traditional side-scrolling shooter; the screen constantly scrolls to the right. The entire stage does not fit on the screen, so moving up and down reveals more of it. This would become the only format in subsequent entries of the series. Each level begins with a top-view stage, then progresses to a side-view stage, which concludes with a boss encounter. The final stage solely uses the top view.
The Exceliza is moved in any direction using the D-pad. It shoots with , which can be held for continuous fire. It is equipped with multiple weapons, which can be cycled left with and right with . The player starts with two weapons and can acquire more by collecting items. The top-view and the side-view stages have different sets of weapons. The player can also equip up to two Claw add-ons, which are small pods that revolve around the ship. The Claws block weak incoming bullets and provide extra firepower by firing single, normal shots.
The Exceliza is destroyed in one hit from an enemy or an obstacle. Losing a life also loses any acquired weapons and Claws. The player gains an extra life at 20,000 points and then every 50,000 points after that.
By pressing + START on the title screen, the player will enter Configuration Mode, where they can change various settings such as difficulty and starting lives, or listen to the music and sound effects.
Weapons
Top View
Twin Shot
Fires two streams of bullets straight ahead.
Back Fire
Shoots one stream of bullets ahead and the other behind the Exceliza.
Laser
Replaces the Twin Shot with a more powerful (but narrower) laser beam.
Wide Shot
Replaces the Back Fire with large plasma balls that shoot ahead and at 45-degree angles.
Five Wave
Shoots waves ahead in a formation of five positions, covering a large area.
Destroy
Shoots three streams of small plasma balls ahead.
Clash
Fires ring-shaped projectiles forward in a revolving pattern.
Hunter
Shoots plasma balls that seek targets.
Side View
Twin Shot
Fires two streams of bullets straight ahead.
Back Fire
Shoots one stream of bullets ahead and the other behind the Exceliza.
Laser
Replaces the Twin Shot with long laser beams that pierce through enemies and walls.
Mega Flash
Shoots circular projectiles in three streams forwards (straight ahead and at 45-degree angles) and two streams backwards (at 30-degree angles), which are less powerful but cover a large area.
Wave Shot
Shoots waves ahead in a tall pattern, which can pass through walls.
Side Blaster
Shoots waves directly above and below the Exceliza.
Nova
Fires ring-shaped projectiles in three directions in the direction opposite to the last direction moved.
Hunter
Shoots plasma balls that seek targets.
Items
Claw
Equips a Claw, a pod that orbits the Exceliza and provides support fire and protects it from damage. The Exceliza can have up to two Claws at a time.
Roll
Boosts the power of the Claw, doubling its rotational speed for a duration. It has no effect if the player does not have a Claw.
Breaker
Surrounds the Exceliza in a force field that renders it invulnerable to damage for a duration. The Breaker turns red before it deactivates.
1-Up
Awards the player with an extra life.
Top-View
Laser
Acquires the Laser weapon.
Wide Shot
Acquires the Wide Shot weapon.
Five Wave
Acquires the Five Wave weapon.
Destroy
Acquires the Destroy weapon.
Clash
Acquires the Clash weapon.
Hunter
Acquires the Hunter weapon.
Side-View
Laser
Acquires the Laser weapon.
Mega Flash
Acquires the Mega Flash weapon.
Wave Shot
Acquires the Wave Shot weapon.
Side Blaster
Acquires the Side Blaster weapon.
Nova
Acquires the Nova weapon.
Hunter
Acquires the Hunter weapon.
Levels
The Planet Nebula
The Underground City
Deeper Inside the Planet
Ancient Ruins
The Ultra Combat Weapon Fortress Plealos
History
Release
Thunder Force II MD was released as the first third party game for the Mega Drive in Japan.
The Swedish version shown below has an interesting story behind it. The distributor in the Nordic countries was Playmix/BRIO, famous for its classic wooden toys and unharmful playthings. This is the first and probably last time they used censorship on a game. The missiles on this early game's front were considered too violent and the picture was replaced by the ship from the Japanese version instead. After they mixed it together, they simple photographed it and printed it on Fujicolor paper (can be seen on the back of the inlay). This version is therefore fairly common in Sweden.