During the game type " IAMACHEATER" to enable the cheat mode. Then use any of the following cheat keys:

Code - Result

[CTRL]+[Left-SHIFT]+0 - Instant Disaster
[CTRL]+[Left-ALT]+C - Increase Money
[CTRL]+[Left-SHIFT]+C - Decrease Money
[CTRL] + [Left SHIFT] + 8 - Earthquake
[CTRL] + [Left SHIFT] + 9 - Hurricane
[CTRL] + [Left ALT] + S - More students
[CTRL] + [Left SHIFT] + 0 - Tornado