The missions are much more difficult but also extended with new and different features and scenarios

Right then and there, I failed the mission, but I couldn't stop laughing for about 10 minutes.

I was on the 1853 Wild West mission and I had completed all the objectives except the one that says:

The missions on "easy" mode are, well, easy!

Most of the game's plentiful features are unlocked by completing a series of increasingly difficult single-player missions.

The story seems like that Quantum leap show mixed with the mission impossible show