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Rovio, of course, has a new company spinning off named "Hatch" that will offer game playing in a "new" way. I use "air quotes" because we have seen this before. It doesn't work well. The only Game platform publisher still thriving is Steam. There are others but they are not as profitable or marketable for that matter. Here's Rovio's try at it:
a new company from Finland demonstrated its new on-demand mobile gaming app that has already signed up more than 80 developers and publishers