Question about paper trading and trading simulation games for intraday

I am trying to learn intraday and was wondering if there's software/website that would allow me to paper trade. I want it to be as realistic to real trading as possible - be able to look at real time feeds (if possible), place bids, buy and sell, see the slippage, see PnL, etc. What are my options?
Thanks for your answers. I will check them out. I have already tried several tools but they did not meet my needs - ninjatrader (forex), bloomberg simulation etc. I am unable to place orders and see slippage etc realistically.

If I get an account with a broker, will I be able to use all these facilities while doing paper trading with them? The reason I want to see all this before doing actual trading is that I want to paper trade in a realistic environment before doing actual trading.

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