Try checking out www.mousesavers.com Type in Connections in the search function on that site, and there is a section that gives you information on all the vouchers, passes, etc. I think it may list some of the restaurants that the Kingdom Lunch vouchers are good at.
You can use them for many buffets but they are not worth the price in most instances. For example, the Crystal Palace is $17.99 (drink included) so with 6% tax and 15% gratuity you are still only looking at $21.93 and the voucher costs $29.50. You can of course use it but you would be losing money if you did. Same with Akershus at Norway in Epcot - it costs only $13.99 (drink not included) for the adult meal so even with a drink and tax and gratuity you would still not come out ahead.
Therefore, yes you can use them but I would not recommend it
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