This exclusive combo includes three iconic City themed sets and one massive volcano playset that fuels the imagination of kids 3-8 years old. The volcano has erupted and kids will have to avoid perils and steer their cars to safety! Mobilize the rescue squad with the included fire station and police station and fuel up at the gas station to race into the action and save the day. Drive your rescue team to the center of the action, the Hot Wheels® Volcano Escape, an interactive motorized set with a new “sweeping” mechanism that elevates cars from the base to the peak of the volcano. I was very surprised of how fun it can be for a whole lot of kids to aim at that middle flat spot of the volcano so that cars can enter, and be rescued if they ended up touching the lava. This set was very entertaining. A. We recommend using alkaline batteries with our products, as they are great for long-term use and help optimize performance. We don't recommend using Carbon-Zinc batteries. While Carbon-Zinc batteries may work well with low-power devices, they can drain after a short period of time and cause certain products to not function properly. Fairly easy to assemble and lots of fun. Although I noticed that larger cars cannot launch through the ramp. It also gets jammed if more than 4 cars are rotating on the ramp at the same time. That being said, there is a lot of variety to keep the kids entertained.