Basic Switcheroo tips:

• Mark cells (e.g. color them green or red) when you know the digit is good or has to be changed.
• When you know a digit is wrong, find out to which digit it can be changed. That could give you more marked cells.

Tips specific for this puzzle:

• Which 8 digits in columns 7 and 8 can be marked as good?
• After following the basic tricks; can the 8 in row 1 be changed to another digit? And the the 2 next to it?