Game guide:Methods for obtaining a SimBot

There are two primary methods for gaining a SimBot: buying it or building it.

My Best Friend lifetime reward
If a Sim earns 40,000 lifetime reward points, they can then summon a new SimBot who will automatically have best friend relationship status with the summoning Sim. This method is useful if the player does not want to spend the huge amount of time it takes to invent it.

Invention
SimBots can be built using the inventing skill, after reaching level 10 and completing an opportunity chain.

At some point after reaching level 10, the inventor will receive an opportunity to build their first SimBot. This requires the following materials:

SimBots take a very long time to construct, although they can be constructed in a single day by a dedicated inventor. There is no option to select the gender of this initial SimBot. After the opportunity is complete, the inventor can continue to build more SimBots (as long as they have the required materials), and may choose the gender of additional SimBots when beginning the construction.

Invented SimBots are classed as the inventor's children in the family tree with a single parent. Any children of the inventor will become the SimBot's half-siblings. Invented SimBots have nicer chassis than the ones bought for lifetime reward points.

Conversion
With The Sims 3: Supernatural, a Sim can be turned into a SimBot through the use of a potion, which can either be created if a Sim has level 8 Alchemy, or purchased from a Potion Store. The potion, like any other, can also be used to turn any other Sims into SimBots.