King of the Monsters is a wrestling game for the Neo Geo in which you control giant monsters (Obviously inspired by King Kong and such) as they battle to the death on top of cities. Unlike most fighting games you can move in any direction instead of just left and right, giving it some extra depth, but all in all, it's actually not that good of a game (Although it has it's fans - So you might still enjoy it). We recommend waiting for the sequel instead, as it is undeniably superior.
WiiWare might be a bit more interesting today. You're getting SPOGS Racing, which is a racer where you play not as a vehicle, but as a single wheel, called a SPOGS Racer. You can bump into opponents to steal parts and enhance your SPOGS Racer. Look on WiiWare World for more info, as usual.