At one point in time, you couldn’t go wrong with Mario Tennis. When it was first released on the Nintendo 64, it was a simple little party favorite, packing hours of addictive gameplay, especially if you brought along friends. The game fared even better on the GameCube with Mario Power Tennis, featuring more great multiplayer options, as well as better graphics and court offerings. But on the 3DS, Mario Tennis Open feels like it takes a stumble for the worse. The core gameplay is still in the game, along with many offerings for single and multiplayer offerings, but it just feels like something is off in the serve.