There are more than 50 million Wii systems worldwide. Logically, the audience for a wide range of games and interactive experiences should be rather big, but based on the evidence so far, either that's not true — or publishers have been hedging the wrong bets. No one has conclusively proved the case for (or against) the viability of mature games on Wii, but 2009 was a litmus test on a number of fronts, including the DS. The results aren't encouraging.