Idea

Hows about a motherload style game, where there are various minerals, and peices of cotton under hte ground. You need to collect both, and when you reach the surface. (By climbing the string) then you need to get the cotton added onto the string. However this costs money, to get more money you need to sell minerals.
You must also spend money on refueling your tank, and any other bells and whistles you want.

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Comments

Sounds great!