Duet Tiles - Dual Vocal Game包含應用內購買。 以下為Duet Tiles - Dual Vocal Game應用內購買價格清單。 Medium SkipIts Pack-$4.19 Medium SkipIts Pack-$6.99 Remove Forced Ads Permanently-$2.99 Removed Forced Ads 1 month-$1.99 Large SkipIts - Discount 25%-$13.49 Remove Ads 1 week-$1.19 Small SkipIts Pack-$2.99 Remove Forced Ads Permanently-$4.99 Small SkipIts - Discount 50%-$1.49 Extra Large SkipIts Pack-$19.99