The guy who got the first copy of the game had an idea, if the specific, repeated yardages bother you - roll 2 different-colored d6 die and subtract one from the other - so it would take up to 5 yards off the play or add up to 5 yards.
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One concern about a d100 result with penalties included in it....at that point, what's the difference between that and Bowl Bound?
And the game was developed to keep eye movement/strain to a minimum...quick, repeated places to look and move on quickly. Having a big d100 chart may spoil that.
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If penalties are too common, you can play with it - maybe just make 1 and 20 be penalties. We all make games our own with house rules and such, and I encourage that (see above).
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Teams average between 1-2 fumbles per game, and long TDs can obviously vary from 0 to 4-5 per game. With a 25% chance of a fumble or long TD occurring each time the Whoa Nellie card is played, and it being played 2 times per game (or 4, for option teams), this gives you basically a 50/50 chance of fumbling or breaking a long TD. In solo play, we did the math, which is why the rules are what they are.
If you want it incorporated more often, do it. If you hate it, drop it. We can come up with something different if you want other ideas, and if they catch on with other players, then maybe we could change the game officially.
Thank you SO MUCH for your feedback and thoughts. It's vitally important and wanted. THANK YOU THANK YOU THANK YOU!