The Sims 2 heralds sweeping changes from the original. The isometric view of The Sims is replaced by a full 3D environment. Sims experience life stages (baby, toddler, child, teen, young adult[TS2:U], adult, and elder) which have them age from birth to death, and their genetics can be passed on to their children. Unlike the original The Sims, where the player can spend forever raising a Sim's skills, the aging system in The Sims 2 imposes a time limit on this before the Sims die. Sims' personalities are given an overhaul, with each Sim having an aspiration, wants, and fears.
