Introversion Software is an independent developer and publisher based in the UK. Their main objective is to do everything in house at a minimum cost, advertising, marketing, producing and shipping the games in person. Introversion Software does not have the budget for conventional advertising (magazine pages, bill boards, etc..), yet they succeed in the market because of word of mouth. Its a very simple principle; somebody likes the game, so he tells his friends. Introversion Software is still here because of it.