Almost all games which i tested works fine except Bomber Raid and Montezuma's Revenge. Both games have problems with control.
Bomber Raid have "jammed" up direction and 1 and 2 buttons doesn't work. When You use pause, after unpause bomb is used.
Montezuma's Revenge have "jammed" left and 1 and 2 buttons probably doesn't work. I'm not sure because game ends with Joe running left on pyramid roof, where you select level and must go down thru hole on roof.
And overally Master System and Game Gear games have low sound volume, no matter which game i run it's about 50% voume level of Genesis games.