Hog Rider at Town Hall 7: max level 2. At Town Hall 18 the cap is level 15. It unlocks at Town Hall 7. Max level per Town Hall: TH7 2, TH8 4, TH9 5, TH10 6, TH11 7, TH12 9, TH13 10, TH14 11, TH15 12, TH16 13, TH17 14, TH18 15.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.