What are some hidden elements that are related to urban transportation in Little Alchemy 2?

In Little Alchemy 2, urban transportation-related elements are not explicitly labeled as "hidden," but some combinations might not be immediately obvious. Here are some elements related to urban transportation and how to create them:

1. Car
- Combination: Metal + Wheel
- Steps:
1. Create Metal by combining Fire + Stone.
2. Create Wheel by combining Tool + Wood.
3. Combine Metal + Wheel to create a Car.

2. Bus
- Combination: Car + Big
- Steps:
1. Create Car as described above.
2. Create Big by combining Philosophy + Planet.
3. Combine Car + Big to create a Bus.

3. Train
- Combination: Metal + Steam Engine
- Steps:
1. Create Metal by combining Fire + Stone.
2. Create Steam Engine by combining Boiler + Wheel.
- Boiler is made by combining Metal + Steam.
- Steam is made by combining Water + Fire.
3. Combine Metal + Steam Engine to create a Train.

4. Subway
- Combination: Train + Underground
- Steps:
1. Create Train as described above.
2. Create Underground by combining Earth + Tunnel.
- Tunnel is made by combining Tool + Mountain.
3. Combine Train + Underground to create a Subway.

5. Bicycle
- Combination: Wheel + Wheel
- Steps:
1. Create Wheel by combining Tool + Wood.
2. Combine Wheel + Wheel to create a Bicycle.

6. Motorcycle
- Combination: Bicycle + Engine
- Steps:
1. Create Bicycle as described above.
2. Create Engine by combining Metal + Machine.
- Machine is made by combining Tool + Electricity.
3. Combine Bicycle + Engine to create a Motorcycle.

7. Taxi
- Combination: Car + City
- Steps:
1. Create Car as described above.
2. Create City by combining House + House.
3. Combine Car + City to create a Taxi.

8. Tram
- Combination: Train + City
- Steps:
1. Create Train as described above.
2. Create City by combining House + House.
3. Combine Train + City to create a Tram.

These combinations should help you unlock various urban transportation-related elements in Little Alchemy 2. If you need further assistance or have more questions, feel free to ask!