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Thunder Spirits is a game for the Super Nintendo released by Technosoft and Toshiba in 1991. The game is part of the Thunder Force series. It is a port of the dually copyrighted Technosoft/Sega arcade game Thunder Force AC, which itself is actually a modified port of the Sega Genesis game Thunder Force III. The SNES version does away with level selection, changes several levels, and features a modified soundtrack, which takes some advantage of the digitized instrument capabilities of the SPC700, although it is not necessarily considered "better" than Thunder Force III or AC; it also changes several songs completely. Some of the graphics are considered improved compared to those two games, and some are worse. The Sega co-copyright could be why the game itself isn't called Thunder Force AC on the SNES.
There are 8 levels in Thunder Spirits, each consisting of the ship battling numerous enemies while side-scrolling, usually with a "mini-boss" about halfway through the level. Then, at the end of each level, a boss (consisting of one or two enemies) appears, which must be defeated before preceding to the next level. Throughout the level, the ship can pick up "Weapon upgrades"; and the player is able to switch between any of up to 5 weapons at any time.
