Well, actually, you know it's much more likely that the hasbro board will automatically shut itself off (built in timer function), leaving the LED on. Again easily fixed with the master switch, but I've found that you can also quickly cycle the momentary to get both boards back "into sync" so to speak.
And yes, these boards are quite small, which is a great thing indeed!
Oh, BTW, the momentary switch in that diagram should be rotated 90 degrees - i.e. if you bend the "legs" of the switch out flat, the leads should be like this
orange---switch---purple
orange---switch---purple
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