Thunder 
              Spirits is the only port of any Thunder Force game for a Nintendo 
              console. Thunder Force 2, 3, and 4 (AKA Lightening Force) were all 
              released for the Genesis/Mega Drive. Thunder Force 5 was released 
              for the Saturn and (there was a slightly better version for ) Playstation 
              [*]. I have heard that the original Thunder Force was only released 
              for the MSX, though that's the extent of my knowledge on the subject. 
              :)
              
              Exceptionally good SNES shooters were few and far between. And Thunder 
              Spirits isn't one of them. It's not on the shitelist either, though. 
              If you like the Thunder Force series and own a SNES, you should 
              go hunt this one down. If you only own a genesis, you probably aren't 
              missing much by skipping out on Thunder Spirits. 
              
              Thunder Spirits is largely identical to Thunder Force 3, both in 
              terms of graphics and level design/gameplay. The weapon system is 
              identical to that of TF3 (except I couldn't find an autofire button 
              - that sucked big time - didn't think to check the config screen, 
              though). Power-ups and 1-ups seem to be a little more plentiful 
              than they were in TF3. 
              
              Though you can't choose which level to begin on, four of the game's 
              eight levels are identical to levels in TF 3 (TF 3 also had eight 
              levels - actually seven and a half - if you care). Level six is 
              also quite similar to level six on TF3. Also, one of the levels 
              (four, I think), is from Thunder Force 2 (it was the final side-scrolling 
              level and had an orangish color scheme - if that jogs your memory), 
              although the boss this time is the ice level boss from TF3.
              
              The biggest design flaw with Thunder Spirits is its lackluster graphics. 
              This game looks as if someone just changed a few levels and then 
              magically recompiled the Genesis code for the SNES - 4 color sprites 
              and all. The effort to make use of the SNES's graphical abilities 
              was certainly minimal, and the graphics are probably what kept the 
              game from becoming popular - TF series fans would probably have 
              bought a SNES if there was a graphically-wicked partial-port version 
              of TF3. Other people would have probably become interested in the 
              series, too. There's no reason for not having graphics equal to 
              Gradius 3, or for that matter, TF4.
              
              Getting down from the soapbox and putting the megaphone away, I 
              have to say that the game plays pretty nicely. Sprite collisions 
              seem to occasionally favor the computer. But, other than the potential 
              lack of an autofire, there are no major problems with the control/play 
              system. OK, one more thing - power-ups may slip by unnoticed when 
              explosions cover the screen. Many are hidden in corners, too. 
              
              Earlier, I said that fans of the series should get the game, although 
              you should also keep in mind that there isn't much new ground being 
              covered here. That's true. I also think that fans of the side-scrolling 
              shooter may enjoy the ride, though you'll probably want to test 
              drive the first two or three levels before shelling out the $5 or 
              $10 that the game is worth.