Demon's Souls

I'm also going to be honest and say that about 5 hours in, I thought about giving up and snapping my disc in half. But I persevered, and about 10-15 hours in something just clicked.

I became more patient, learned how to effectively beat the enemies, and started having fun.

The atmosphere it created and the Incredible detail in the worlds, buildings, terrain and enemies (especially the bosses) really astounded me.

For me, it was hard and unforgiving. It's not a game I could say I can relax to. But it is a game that, when things are going well, is the most rewarding that I've ever played.