Fixed that for you.
And to a lesser but still annoying degree, any mandatory section with completely incongruous gameplay to the main selling point of the game. For example, if I've bought a platform game, then I don't want my progress halted by my inability to win a speedboat race. That's not what I signed up for. If it's really worth including, then either make it optional or expand its visible significance so that people know they're getting a multi-genre platforming and speedboat racing game, and can make their purchasing decisions accordingly.