[header] How to make a playable ghost on the sims 3 [title] Create at least two sims. [step] You can make them however you want. [title] Kill one. 
[step] You can kill them however you want, depending on the ghost colour. One favourite is drowning (build a pool, make the sim get in, delete the ladder and build a wall right at the edge of the pool) but there are many other ones.