Japanese and American tastes have always been different. But what we are witnessing now is a particularly fascinating divergence. American consumers are spending more of their time and money on smartphone and tablet games, while console game spending is increasingly focusing on massive, graphically stunning blockbuster titles on Xbox360 and PS3.

The casual gamers are shifting to mobile games, while hardcore gamers remain attracted to sprawling epics on home consoles. The overall video game spending in America keeps declining month after month, as casual titles and mid-list games slide. But the Triple A whales like the Call of Duty series are doing better than ever.

In Japan, Nintendo has been able to battle back iPhone and Android game invasion with a nostalgic series of portable games that basically recycle the biggest hits of '80s and early '90s. Mario, Pokemons and other portable heroes are slowly losing their grip on U.S. and European consumers. But in Japan, some form of national nostalgia is keeping Nintendo on track. The problem here is that the Japanese success of the 3DS may now be convincing Nintendo that it does not have to reconsider its business strategy.

The smartphone and tablet game spending continues growing explosively across the world. Unlike console games, mobile game sales in China are legal. The global gaming spending is shifting towards new hardware platforms even as console mammoths like Halo still reign in America.

At this critical juncture, Nintendo has managed to cocoon its home market in a web of nostalgia, turning the 3DS console and its Eighties left-over franchises into epic bestsellers yet again.