You have to complete all of the levels and then you get intense mode.
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In the game run on adventure and I swear to you, I played it myself because I was curious, there is 50 levels, but you can continue to play in intense mode.
he's impossible on easy.
You can't.
It can't be run in DOS mode because it relies on Windows-specific APIs. DOS mode is running the program in either DOS, or in a DOS box under Windows. Basically, it is saying that it can't run on DOS because it is not a DOS program.
Download the mode or change the play mode to creative.