I own the original Payday game. It is a game about robbing banks and killing police officers. It got old pretty fast though; with missions quickly panning out the same way as you would usually expect them to with very little dynamic content, or changes from mission to mission. They added downloadable content, as every developer does these days, but it did not stray very far from that original, core vision. The game must have done well though, spawning a sequel a few years later.

Payday 2 has been released, along with about three thousand pieces of downloadable content, and is doing extremely well. This was definitely a case of the follow up game capitalising on the things that the original game did well, while also expanding on it in a number of intelligent ways. The game now allows for stealth completions of missions, something sorely lacking in the first game, and has an enormous number of mission types and maps that keep the game feeling fresh every playthrough.