Press F2 and enter these to get to the level.

Password	Effect
7766	Caves
4476	Caves
8282	Caves
3425	Caves
1053	Caves
6331	Jungle
1960	Jungle
2818	Jungle
4757	Jungle
5284	Jungle
2219	Lake
4125	Lake
7962	Lake
9877	Lake
1786	Lake
0692	Lake
3505	Lake
4370	Mountains
3541	Mountains
2823	Mountains
1286	Mountains
4400	Mountains
5139	Mountains
6067	Mountains
8498	Mountains