The discount is off MSRP so you have to wade through pages and pages of mass market junk to find deals. Keep in mind the free shipping threshold is very low ($25, $0 for prime members) so even prices that match online retailers are good.
The entry page is here: Amazon Toy Summer Savings Click the link, scroll to the bottom, and click the Games & Puzzles links under 50-70% off and 70% or more. I didn’t search through the 25-50% category, frankly, IMHO that’s not enough to offset the MSRP pricing even with free shipping.
Unfortunately, Amazon considers any price they have for an item as qualifying for 50%-70% even if it's a used item being sold by some third party (which might even be just a single person and not a business).
I just looked and there are only a dozen games in this sale and nothing of interest to anybody here. Clicking on the left column reveals everything in the store. The link below if what's available in the sale.