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How about one symbol on each reel that is a number in the range 1 - 5. If you get two or more in view, or maybe lined up, it adds them together for that amount of free spins. The multiplier is the number of those "numbers" in view. So if you get say a 2, a 1 and a 3 on three of the reels you get 6 spins at 3x. or if you get a 2, a 4, a 3 and another 4 in view, you get 13 spins at 4x. Etc. Obviously it must be able to retrigger. If you only get one number in view, it acts as a multiplier if it fits in a winning line.
I'd suggest making it a 9-line slot, with scatters and a wild on every reel, though the wild is superfluous if you use the above idea as the number becomes a wild.
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