Resident Evil 2 has a demo available, with a twist: you only have 30 minutes to play. It's very high end, so fair warning to PC users. Steam version is here, not sure on other consoles.

Sure, that sounds rough, but imagine what speedrunners are up to.

Oh, and it requires an internet connection. Presumably to make sure the timer thing works.

somebody get agdq to wedge a demo speedrun in