Very non-linear difficulty curves?

[StaceyPowers]

What games feature difficulty curves that are shallow for most of the game, and then really steep at the end?

[Lens]

Dark Souls series is a typical example. The games are notoriously very challenging, the difficulty curve is also very steady throughout, but if you get to the final bosses, it's significantly harder.

 

[Scorpion]

For me, games like *Dark Souls* and *Cuphead* start off manageable, then ramp up difficulty dramatically, testing skills and patience.