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Looking for a stock market simulation that's as close to the real thing as possible 
Thinkorswim's ThinkDesktop platform allows you to replay a previous market day if you wish. You can also use paper money in stocks, options, futures, futures options, forex, etc there. I really can't think of any other platform that allows you to dabble around in so many products fictionally. And honestly, if all that "make[s] the learning experience a bit more complicated" and demotivates you, well thats probably a good thing for your sake.