Flip the Core review. Classic Game Room presents a CGRundertow review of Flip the Core for Nintendo DSi. Picture Gradius in your head. I know you can. Now pretend the game's on a rotisserie and you can turn your perspective 90 degrees in order to avoid enemy fire or walls or whatever else your heart desires. Just as Super Paper Mario was a 3D game stuck in 2D, so too is Flip the Core, an unforgiving but innovative SHMUP that thumbs its proton cannons at reality. This video review features video gameplay footage of Flip the Core for Nintendo DSi and audio commentary from Classic Game Room's TJ.