By using cheats, you have two options.
Option One:
Option Two:
The way without cheats is by advancing through the ranks of the jobs. Get a job by going to the newspaper. Then, go to your Skill panel. If there's a blue circle around a skill (for example, Body) that your sim doesn't have, then he or she will have to build body. If your sim doesn't miss work and has all of the skills right, then he or she will get a promotion eventually. Once the sim reaches level 5 or level 6, he or she should be able to get a career reward (go to Rewards, then to Career Rewards, then click on the reward that isn't greyed out and place it).
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you have to have Sims 2 university expansion pack then get a career and it is a career reward
On the PC, the top job in the music career is Rock God. The career reward is a guitar with huge amps and speakers called the Rock Hammer.
One of your controlled sims has to have reached the top of the natural science career. i think that career is only available with the Sims 2 University expansion.
Get a job in the Paranormal career track, and you will get it as a career reward. You can get ressurect o nomitron by cheats also. Type boolprop testingcheatsenabled true, than shift click on newspaper and select "Career rewards", than "Paranormal". It should appear in your sim's inventory, where career rewards are.
You must have a Sims 2 University expansion pack installed. You can get the cow plant as a career reward. Your sim must graduate college and get a job in the natural science career track to get it. You can also get a cow plant on the Sims 2 University with one of these 2 cheats: --Boolprop testingCheatsEnabled true. By using this you are allowing yourself many options you do not have in regular gameplay. To use these option press shift+click on the object you want to use. You will get a wide variety of new options for the object including "Force error." NEVER select the force error option for any object. To get the cow plant, Shift+click on the newspaper and unlock the natural science career reward. --OR, You can use the cheat Unlockcareerrewards. It will make all career rewards available to the sim you are controlling at the time.