Currently there are three modes:
Easy:
Sprint Speed: 10Sprint Duration: 15s
Sprint Cooldown: 0s
Monster Speed: 1
Key-O-Meter: Enabled
Medium:
Sprint Speed: 7Sprint Duration: 13s
Sprint Cooldown: 3s
Monster Speed: 2.5
Key-O-Meter: Enabled
Hard:
Sprint Speed: 5Sprint Duration: 10s
Sprint Cooldown: 5s
Monster Speed: 3.5
Key-O-Meter: Disabled
Good luck surviving the midnight at forest, make sure to look out for the monster that's trying to get you...