4. The Stanley Parable
Units Sold: 1.8 million
Metacritic Score: 88
This game ranks 4th in our list of most successful indie games of all time. It started out as a free mod for Half-Life 2. It had gotten so much popularity that they created a new stand-alone game which featured new story elements and a lot more content. The Stanley Parable is one of the games that popularized a more narrative style instead of typical gameplay. Humor was also one of the biggest factors that contributed to this game’s success.
