Metal Slug 6, from what I know after watching a YouTube of someone playing it, is rather hard. Just like the other games in the Metal Slug series, it is still a great game to play!! The graphics have some flaws (e.g. the gray alien things looking weird when they jump into the air) but  they are still good for this game, in particular. I definitely would want to play this game again, (if I had the money and saw the arcade machine for it) will definitely rock your world with shooting bad guys in this cool run-n-gun game, which happens to be the last  Metal Slug
 game in the series that is for arcade. (followed by Metal Slug 7 for DS). As for the sound, it basically has most of the sound effects that you might hear in other Metal Slug games; but as for the music it is epic!!! :-) The story is still wonderful as usual; this time involving you helping General Morden and his rebel army defeat an entirely new threat: Gray aliens with bumpy big heads that stick out, etc which really does make for a good story that is well-suited for this particular game. In depth, this game really has lots to do; with regards to how many enemies you have to defeat and lots of food items and hostages to collect/save. it also would probably take a while to beat; say, almost an hour of playing, similar to other games in the M Slug series. This game is very hard in difficulty; confound those stupid gray aliens w/ bumpy heads sticking out from the rest of their body!!! Overall, I think this game is so much fun to play; regardless of how hard it is; what with the boss battles w/ half-weird and half-fun music playing in the background. People should definitely try this game out!!

This is a good review you made here. But maybe you could add a little detail and break it down into different categories next time. Overall this is a fine you did here.