Rechargeable Batteries Question

Rechargeable Batteries Question

I found an Electronic Dance Maker today at a garage sale for fifty cents. I bought it since I figure I'll probably never be able to afford Dance Dance Revolution... Anyhow, while reading the instructions, I noticed that it says I need to use three new C batteries and that they are to be the non-rechargeable type. Does anyone know why I should not use rechargeable batteries for my dance pad? Is this a safety issue? Would rechargeable batteries break my toy? Or is this a ploy to make me keep buying new batteries? Does anyone have one of these and use rechargeable batteries with it?
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Help in ordering bargain glasses?

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Seedlings question, as well as a few other questions

Some of my hydrangeas

Some of my hydrangeas