In the early days of engine building, a pre-Wankel rotary engine powered thousands of aircraft. One of several problems: It spewed castor oil on its pilots.

An engine swap should be a joyous occasion, but this mechanic turned the process into a nightmare for more than 70 owners — and was jailed for his efforts.

Sunken Engine blends relaxing repair simulator gameplay with creeping Lovecraftian horror, making it one of the most unique sims on Steam.