Thunder Force IV

Gameplay

The game format is mostly unchanged from the previous game (horizontally oriented and forward scrolling). However, many of the stages now stretch beyond the height of a TV screen, which allow the player more space to maneuver and dodge incoming fire (but also makes it easier to miss power-ups). Also, the player now has the option choosing the play order of the first four stages, instead of just the starting stage like in Thunder Force III.

The weapon system is similar to Thunder Force III. Featuring the same upgradeable defaults, and unique extra weapons that are either exclusive, or were in previous games. Again, upon ship destruction, the weapon currently being used is lost, apart from the defaults. The CRAWs return, and basically have exactly the same function as their Thunder Force III counterparts. The speed setting also returns, although it is represented by a percent gauge from 25 (lowest speed) to 100 (highest speed).

The most significant addition to the ship arsenal is the Thunder Sword, a very powerful lightning-based frontal attack. At the game's halfway point, the ship receives an add-on part which enables the use of the Thunder Sword. From here, the one requirement of using the Thunder Sword is that the ship be equipped with CRAWs. When the ship is not firing any weapons, a charging noise is heard (followed by a chime when fully charged) and the CRAWs will appear to be surrounded with electricity. The next press of the fire button will discharge the Thunder Sword. The blast is stronger if charged longer and is at its strongest when fully charged.

Plot

Taking place directly after Thunder Force III, the ORN Empire is thought to be defeated by the Galaxy Federation, but still suffers from increasingly frequent attacks from hostile forces. The forces are discovered to be the "Vios", an army made up of allies and residual forces of ORN. The Galaxy Federation discovers the location of their headquarters on the planet Aceria and attacks, but since the power of Vios has grown greater than the previous ORN Empire, the Galaxy Federation forces are initially defeated. Once again, they develop a new small yet powerful fighter spacecraft, the FIRE LEO-04 Rynex to eliminate Vios. The player controls Rynex and travels through ten stages while battling Vios forces.

Development

Thunder Force IV was the very first game with a sophisticated regional lockout program. Unlike previous Mega Drive games, the player could not play the Japanese version on a European Mega Drive or Sega Genesis (and vice versa) with a simple pass through adapter. However, cheat devices such as the Game Genie or Action Replay would enable the player to do so, as did later adapters such as the Mega Key.

Thunder Force IV also has the distinction of being one of the only European Mega Drive games to have been properly adjusted for the screen refresh rate of European PAL televisions. The game ran at the correct speed unlike most games which ran 16.7% slower than their NTSC counterparts due to the lack of any adjustments by Sega of Europe or other European software distributors which would have been required to address the differences between the different TV systems. The game's resolution however was not adjusted to meet the higher resolution of the European TVs, which resulted in black bars on top and bottom of the screen, like with most other Sega Mega Drive games.

Reception

MegaTech magazine praised the video effects, but noted that "the basic gameplay is nothing original". Similarly, Mean Machines criticised the title's lack of originality whilst acknowledging that it was graphically accomplished. Retro Gamer included Thunder Force IV among top ten Mega Drive games, praising its " amazing visuals, over-the-top weaponry and a stunning soundtrack that perfectly complemented the frenetic on-screen action."