FREE Slider at White Castle on National Slider Day (May 15th)
FREEBIE
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White Castle is offering a FREE Original Slider on Wednesday, May 15th for National Slider Day! No purchase necessary. Just show the coupon at your local participating Castles restaurant to redeem or use the code SLIDERDAY in the White Castle app. Limit one coupon per customer per visit. Valid 5/15/25 only.
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