Royal Garden Match pairs a match-three with a restoration story: you've inherited a castle and an overgrown garden, and clearing puzzles is what funds bringing it back.
The booster system has real depth — matching four or five creates line bursts, cross bursts and colour boosters, and merging two boosters produces something considerably larger than either alone.
Merging two boosters creates a much larger effect than using either alone — combining a line burst with a colour booster, for instance, clears far more than both used separately.
You've inherited a royal castle with a neglected garden, and completing match-three levels earns what's needed to restore it.
Yes — drag to swap. Nothing to install.