Ronja ~ I thought the Royal Games Castle seemed too small to be a 3x3 too, so I went wayyyy into the recesses of my inventory to find it. Yep, it's 3x3. (Updated post 1)
stormaurora ~ At 3x3,...
For iPhone:
Go to Settings, scroll down & tap Safari, scroll down & tap Clear History & Website Data, then tap again. There's also even further down Website Data that you can tap.
Not sure...