Instant Million in 2D game:

During play, go to the City Info icon. On the Budget Screen press and hold R1 and then press X, Circle, Triangle, Square then release R1. Next press and hold L1, then press X, Circle, Triangle, Square, then release L1. Now press and hold R2 then press X, Circle, Triangle, Square, then release R2. Finally, press and hold L2 and press X, Square, Triangle, Circle and then release L2. As soon as you do this, a cheer will go up and you will be a million dollars richer.

Bond Embezzlement:

This sets all subsequent bonds to 0% interest. Note: There is a risk to using this -- this could result in fines of up to $100,000. At the Budget screen, hold Triangle and press L1, L2, L1, L2, R2, R1, R2, R1.

Slot machine:

Start a new game and choose Recreation. Now build a Marina near a water section. Enable "Legalized Gambling" option under the City Ordinances. in the Budget Menu. Now use the "Query" tool to highlight the sailboat, and then press L1. You should see a slot machine. Press Circle to stop the slots to win buildings and disasters.