Level 5-2 only has 2 stopping points. The first to face the first tiger, and the second to face the second tiger. In the rest of the level the player is free to advance to the right, accumulating enemies on the screen, and thus causing corruption in the graphics due to the excess of sprites on the screen that the Mega Drive's VDP cannot process. Solution: recompile level 5-2 by adding stopping points, where you can only advance if you eliminate the foot soldiers from the place.